Abstract:Numerical simulation and physical model experiment are important methods for studying nearshore wave.Before implementing numerical simulation and physical experiments,it is necessary to determine the incident waves elements based on the characteristics of nearshore waves.Nearshore waves are typically dominated by mixed waves,which contain multimodal independent wave systems,each of which requires several wave characteristic parameters for complete description.It is of great significance to realize the selection of representative sea states for multimodal wave systems.Firstly,this paper introduces popular data mining algorithms,and then according to the measured wave data of Hambantota Port,it selects the representative wave conditions defined by two-dimensional,three-dimensional and multi-dimensional wave characteristic parameters respectively using maximum dissimilarity algorithm(MDA).The results show that the outcome of the MDA is better than the manual results for the two-dimensional wave parameters that can be artificially selected.If the wave conditions are defined by three-dimensional or even multidimensional wave characteristic parameters,the representative sea states selected by MDA algorithm are even distribution in data space and have high representativeness,which proves the MDA algorithm is suitable for selecting representative wave characteristic parameters under mixed sea conditions.

Abstract:In the waterway improvement projects,underwater blasting is often used to remove the reefs that obstruct navigation,and the shock waves generate by blasting would affect the safety of fish.At present,bubble curtain is commonly used to reduce the shock waves peak pressure.In this study,a numerical model of bubble curtain is constructed to investigate the reduction effect of bubble curtain on blasting shock wave pressure and the minimum length of fish survival under the effect of different arrangements.The results show that the reduction of shock wave pressure by bubble curtain is greater in the first half(65%-69%)than in the second half(10%-12%).With the increased of bubble volume proportion,the reduction rate of bubble curtain on shock wave peak pressure also increases.However,when the bubble volume proportion reaches 40%,the increase of reduction rate decreases and tends to level off.The minimum length of fish surviving under the bubble curtain 10,15,and 20 m from explosive sourceare 20~34,14~30,and 12~24 cm respectively,and the minimum length of fish surviving under the bubble curtain thickness of 2,3 and 4 m is 12~24,10~22 and 6~17 cm respectively.The results of the study can provide theoretical basis for the protection of fish resources under the implementation of waterway regulation projects.

Abstract:To support the healthy development of China's shipping center and better serve the construction of a country with strong transportation network,this paper puts forward the Chinese characteristics,connotation composition and mission requirements of China's shipping center in the new period,and on this basis constructs the evaluation system for the development of shipping center with the background of Chinese characteristics,which comprehensively measures its comprehensive strength and development level,as well as its support role on national strategy and regional development.The results show that China's major shipping centers are generally at a high level in the development of comprehensive transportation hubs,present a multi-echelon development pattern in the construction of sea and land service networks,present the development trend of international shipping service center led by Shanghai and other regional shipping service centers with their own characteristics in the shipping service industry cluster,and generally serve national strategy and regional development in the strategic support effect at a high level in terms of strategic support effect.

Abstract:Torsional effect will occur in pile-supported wharves under bi-directional horizontal ground motions.The Chinese code for wharf seismic design does not provide specified provision for that phenomenon.Nevertheless,in domestic code for seismic design of buildings and foreign wharf codes,similar problem is addressed by combining the effects of action in two principal horizontal directions of the structure under single directional ground motion.To verify applicability and accuracy of the combination rules from aforementioned codes in pile-supported wharves,30 pairs of horizontal ground motion records are selected to conduct time history analyses and modal response spectrum analyses for different wharves.The internal forces of pile determined by spectrum analyses were combined in accordance with rules in codes,and the internal force ratios of combined values and forces from time history analyses are calculated.Then statistical analysis is conducted on the internal force ratios,and the formula of correction coefficient for internal forces is proposed by the regression analysis of average values for force ratios.The results show that:1)The internal forces of pile under bi-directional ground motions are much larger than those of single ground motion.Thus,the seismic analysis of wharf should consider the effect of bi-directional motions.2)The correlation between the internal forces determined by the square root of the sum of the squares(SRSS)rule in the Chinese building code and the time history method is better than that of the combination rule in foreign wharf design code.The internal force ratio determined by the combination rule in Chinese code obeys lognormal distribution and its average values approach the value of one,with a smaller dispersion of force ratio.Consequently,SRSS rule is recommended for seismic analysis of wharves under bi-directional ground motions.3)For long-term pier structures,the combination method may underestimate the seismic response,and the proposed formula should be used to correct the internal forces of the pile foundation.

Abstract:To the issue of multiple structural forms of container terminal approach bridges and no clear comparison of cost when used,a study is conducted on the structure and investment of container terminal approach bridges in the Yangtze River estuary region.Design methods that comply with current standards are adopted,and different bridge deck schemes such as small box beam structures,hollow slab structures,and hollow slab beam structures with different spans are proposed under local construction conditions.The stress is calculated and a reasonable structural cross-section is determined.Using the current hydraulic engineering budget software to calculate and compare the estimated investment of approach bridges for different schemes.The results show that for approach bridges with a spacing of less than or equal to 20 m,the investment in the hollow slab scheme is lower.For approach bridges with a spacing of more than 20 m,the investment in the small box girder structure is lower.Overall,the investment in the 20 m span hollow slab structure is the lowest.Within the range of 20-30 m,there is no significant change in investment in small box girders.

Abstract:To deeply implement the national “dual carbon” policy,promote the improvement of shore power utilization rate during ship berthing,and further reduce air pollutant emissions during ship berthing,this paper introduces the background and significance of shore power construction in ships and ports,analyzes the current development status and trends of shore power technology at home and abroad,and briefly describes the shore power construction situation of major domestic ports and shipping enterprises.Based on the current situation of shore power usage in key domestic ports and shipping enterprises,this paper analyzes the main influencing factors that restrict the improvement of shore power usage rate.Focusing on the lack of unified hardware standards for shore power equipment and facilities,isolated islands in information system construction,and temporary equipment failures,the paper proposes multiple suggestions and countermeasures,including unifying equipment standards,strengthening organizational scheduling,promoting intelligent construction,balancing charging policies,and policy guidance.The government needs to strengthen policy planning and services,port and shipping enterprises need to actively play a leading role,and industry departments need to extensively collaborate and participate to form a working force,jointly promote the improvement of the utilization rate of shore power at ship terminals,and contribute to high-quality development.

Abstract:We compare the results of the section physical model test of a sloping embankment project with the theoretical calculation results of the national standard,Jensen & Bradbury method,Pedersen method,and Martin method.The results show that the combined force values and distribution patterns of Martin method's impact and pulsation pressure formulas are in good agreement with the section physical model result,so it is recommended for calculating the horizontal wave pressure and buoyancy of the wave wall.The distribution pattern of wave force on the wave wall is that the horizontal wave pressure on the wave wall reaches its maximum value above the cover prism,and decreases both above and within the cover prism.The L-shaped wave wall structure can quickly reduce the horizontal wave pressure at the bottom,thereby reducing the buoyancy force on the entire bottom of the wave wall.The buoyancy force decreases linearly along the bottom of the wave wall,and is not zero at the root behind the wall.By comparing the results of sectional and overall 3D model tests,it is found that the wave pressure has a significant reduction on the uncovered area,but has a poor reduction on the covered area,while there is basically no reduction in buoyancy.The larger the wave direction angle,the smaller the reduction coefficient.The reduced wave shape remains basically unchanged.

Abstract:Combining with the design of the plane layout scheme of the breakwater of a central fishing port,in view of the problem that the anchoring conditions of the harbor pond cannot meet the corresponding wave height requirements,this paper calculates the wave height distribution of the water area in the port using the MIKE21 BW module.To improve the effective anchorage area in the harbor basin,the paper puts forward two kinds of optimal design schemes of breakwater,and determines the final optimization scheme of breakwater through calculation and comprehensive consideration of engineering cost,operation and maintenance.The results show that the methods of extending the breakwater and adjusting the angle of the entrance gate can effectively reduce the wave height in the port basin,thereby increaing the effective cover area of the port area and meeting the anchoring stability requirements of the anchorage.

Abstract:3D laser scanning technology is mainly used in topographic mapping,building modeling and cultural relic restoration.To expand the application of this technology in physical model test,Trimble CX 3D laser scanner is used to measure the overall shape of physical model of riprap dike with broad shoulder,and then the scanning data are processed and mapped by Trimble Realworks 9 and GMT 5.4.Compared with camera photos,3D laser scanning technology possess the characteristics of more convenient operation,higher accuracy and more outstanding visualization,and it can replace some functions of traditional measuring instruments in physical model.The scanning results before and after the test show that the riprap dike with broad shoulder will deform obviously under the action of waves,but eventually changed into a dynamic stable S-shaped profile.

Abstract:In view of the business operation of the liquid chemical wharf and the high requirements of the wharf for the reliability,safety and control ability of the fire control system,this paper discusses the technical application of the automatic fire control system of the liquid chemical wharf,and puts forward that the redundant ring network of the fire industry and the one key start control technology are used to network the wharf fire monitor equipment,fire pump station equipment and foam station equipment,so as to achieve the integrity,manage ability and control ability of the wharf fire control system.The paper introduces the characteristics of the fire control system,control system network architecture,operation mode,and functions of the automatic in the Guangdong petrochemical product terminal project,and applies the fire control one click start operation method to improve the safety,availability,and reduction of misoperation rate of the port production fire control system.

Abstract:Numerical simulation study is carried out to increase jet scour productivity and reduce energy consumption in dredging engineering.Based on the sediment scouring model,a moving jet scouring model is established for a silt bed with a median particle size of 0.048 mm,and the reliability of the numerical simulation parameters are verified combined with the physical model test results.The model successfully simulates the phenomenon of vertical submerged jet scouring the sand bed,and analyzes the influence of moving speed on the jet scouring depth,productivity and specific energy.The results show that the scour depth and cross-sectional area of gully decrease with the increase of moving speed.There is a range of the most economical jet moving speeds,so that the scour production is maintained on a good basis with as little energy consumption as possible.The research results provide theoretical support for jet scour to increase production and reduce energy consumption.The range of the most economical jet velocity can be used to guide dredging engineering practice.

Abstract:With the development of water transportation in China,the safe operation of large ship locks is crucial.To ensure the stability and safety of ships docked in the lock,it is necessary to monitor the operation status of the floating mooring column in real-time.Considering that the load sensitive area of the floating mooring column is directly related to the deployment of monitoring sensors,but there is still a lack of systematic research on this issue.Therefore,this paper relies on a large ship lock project,builds a three-dimensional numerical model of floating mooring column structure,and studies strain paths of the floating mooring column under at different mooring forces and mooring angles based on finite element numerical simulation method.The results show that the load sensitive area of floating mooring column structure by mooring force effect is near the welding position between the hollow cylinder of the floating mooring column and the fixed steel plate,which can provide a reference for the installation of the floating mooring column strain gauge and future work.

Abstract:To promote Jiangsu provincial high-quality development of water transportation,Jiangsu Province is currently conducting research on “Grade 3 to 2” adjustment of waterway grid.This paper introduces the concept of “throughput per kilometer waterways” and analyzes the data of inland ports and waterways in Jiangsu Province in 2022.The results show that the throughput per kilometer waterways in southern Jiangsu is four times that of northern Jiangsu.To avoid constraints on its economic development,given the limited land and riverbank in southern Jiangsu,Prioritizing the adjustment of Sunan Canal through “Grade 3 to 2” is reasonable.Taking into account the characteristics of waterway grid in different regions of southern,central,and northern Jiangsu，this paper also analyzes other issues that need to be focused on，which can be reference for Jiangsu provincial water transportation development.

Abstract:There are some problems such as high flow velocity,structural cavitation and uneven discharge of lock chamber,because of the high-head and short delivery time,which have adverse effects on the safety of ships passing through the shiplock and the structure of the shiplock.The papper combines with the actual operation of the Three Gorges Shiplock,a new type of double-layer inertia-equilibrium filling-emptying system is proposed,which reduces the elevation of some galleries and diversion openings,forms the bottom filling-emptying gallery,and increases the layout area of shiplock floor outlet.Under the condition of increasing water delivery volume and maintaining water delivery time,it is possible to ensure the safety of the filling-emptying system structure and the uniformity of water flow conditions in the lock chamber.The RNG k -ε turbulence model is used to simulate the filling and discharging process of intermediate shiplock.The hydraulic characteristics such as flow rate,water level change of lock chamber,velocity and pressure distribution of filling-emptying system are analyzed.The research results prove the feasibility of double-layer inertia-equilibrium filling-emptying system which can provide technical reference for the design of filling-emptying system of high-head and abyssolith shiplock.

Abstract:High head navigation buildings in mountainous waterways are often arranged in combination with ship locks,ship elevators,tunnels,and intermediate channels.Due to the mutual constraints and influences on the carrying capacity of various navigation buildings,their calculations are relatively complex.This article combines engineering practice and analyzes the matching of time passing through various buildings and its impact on navigation efficiency during the calculation of passing capacity.It is pointed out that when arranging navigation buildings in combination,the one-time operation time of the ship lock or ship lift should be used as the basis to recheck and calculate whether the one-time operation time of other navigation buildings such as navigation tunnels and auxiliary gates is less than the basic time.When it is more than the basic time,the combination form,layout form,and construction scale should be reasonably adjusted.The achievements can provide reference for similar projects.

Abstract:Since 2010,the island in the heart of the Irrawaddy River(Yi River)has entered a period of degradation,with receding shorelines and dangerous conditions in the river section crossed by the pipeline.In order to maintain the river stability and eliminate the safety hazards of oil and gas pipelines,membrane bag concrete,permeable ding dam cluster,rigid bank protection,semi-rigid bank protection and simple slope protection have been used for long-term river and bank management.To evaluate the management scheme and effectiveness of the river crossing of Yi River pipeline,this paper combines the evolutionary characteristics of the Yi River section and previous years' management projects,and uses indicators such as the area of the river core island,the degree of erosion and the burial depth of the pipeline to comprehensively evaluate the impact of different stages of management schemes on the safety of the river and pipeline in the crossing section.The results show that the treatment scheme with the core measures of regulating water flow,strengthening bank protection and siltation protection has slowed down the degradation of the river core island and the trend of westward migration of the main river channel,and has effectively ensured the safety of the pipeline during the flood season.The phenomenon of exposed pipe has been gradually eliminated.The experience of Yi River system management can provide a reference for similar projects.

Abstract:The navigation scale of mountain canal is small,with large gradient,fast flow velocity,obvious changes in dry and wet seasons,and complex hydrological conditions.The reconstruction project of Lishui Liandu Bihu Bridge is located in the middle reaches of the Oujiang River mainstream.The current and planned canal routes of the river section it crosses are different,and the bridge construction needs to meet both the requirements of current canal navigation and reserved planned canal development space.Therefore,higher requirements are put forward for the layout of bridge piers.Through calculation and analysis of the navigation clearance scale of the bridge,it is shown that the planned canal layout meets the navigation requirements within the main span of the main bridge,while the current canal layout is within the left span of the main bridge,and the left main pier is located at the edge of the current canal,which will have an impact on the navigation safety of the current ship.Using a planar two-dimensional flow and sediment mathematical model,the impact of bridge reconstruction on the current and planned canal flow conditions and sediment erosion and deposition is studied.Improvement measures are proposed to widen the current canal to the left by 4 meters to meet navigation requirements,which can provide reference for bridge reconstruction projects across mountainous areas.

Abstract:Canal development has a significant promoting effect on regional traffic improvement and economic development.However,more and more attention has been paid to the negative environmental impact caused by its large development intensity and complex construction contents.Aiming at the identification of aquatic ecological impact of Pinglu Canal,through the analysis and classification of the construction contents of the inland waterway of Pinglu Canal,combined with the ecological impact analysis of waterway regulation and avionics junction construction,this paper proposes three types of key evaluation contents of aquatic ecological impact of inland river section of Pinglu Canal by analogy analysis and ecological factor identification,and analyzes the impact of construction contents on the main ecological factors.Further more,it sorts out the system of aquatic ecological protection measures from two dimensions of engineering design and ecological restoration.The research results can provide reference for the identification and restoration of the ecological environment influence in the canal development and construction project.

Abstract:The waterway between the Three Gorges and Gezhouba dams is affected by the combined effects of flood season flow and reservoir regulation,resulting in high flow velocity,chaotic flow patterns and poor navigation conditions.Under high flow conditions,it is difficult for ships to navigate under large flow and needs to restrict passage,which has become a controlling river section that restricts the improvement of navigation efficiency of the two dam hubs.The deep water rapids and dangerous shoals between the two dams are mainly located at the throat of the main waterway and cannot be treated through conventional remediation methods.In this paper,by means of blasting rocks and other methods to adjust the riverbed shape,reduce the steep rise of the riverbed,expand the water flow area,the typical navigation obstruction beach “four beaches and one bend” is regulated.According to the actual regulation effect of Liantuo section,the regulation effect of this section is obvious,and the flow condition of the channel is improved significantly

Abstract:Beibu Gulf of Guangxi is an important water area for the development of marine transportation and port logistics industry.Based on the data of ship automatic identification system(AIS)in 2020,this paper plots the customary shipping routes of the Beibu Gulf waters.With the help of mathematical statistics,it analyzes the ship traffic flow and traffic density of 21 ship traffic flow gateways on the customary shipping routes of the Beibu Gulf waters in Guangxi and puts forward the route planning suggestions.Meanwhile,it calculates the passage capacity of the shipping routes and puts forward reasonable suggestions.The results show that the shipping routes in Beibu Gulf generally present a basic pattern of “five trunks and sixteen branches”,and the number of ships in the ship intersection area is large and the traffic flow is complex,so it is necessary to strengthen the research and management of navigation risks in key and special waters.The navigation capacity of Guangxi Beibu Gulf can meet the current requirements of ship navigation in waters and the port throughput planning in 2035.The research results can provide decision-making support for shipping routes planning,sea area use management,and marine ecological environment protection in the Beibu Gulf of Guangxi.

Abstract:It is of great significance to ensure the smooth,safe and efficient navigation hub of the large-scale ship locks on Xijiang River and the Yangtze River.Aiming at the problems that the three elements of lock-ship-channel have many influencing factors and strong coupling,channel water flow is unsteady,water level has high amplitude and fast rate of change,etc.,the multi-dimensional analysis modeling and simulation of large-scale ship lock passing capacity,unsteady flow down ship lock channel of hydrodynamic characteristics analysis,multi-constraint unsteady ship-lock hydrodynamics refinement modeling and other methods are studies.These methods overcome the problems of navigating the middle channel of the lock under complex and changeable conditions,rapid lock-passing under the cooperation of new standard ship types and locks,and key technologies for improving large-scale ship lock passing capacity such as capacity expansion construction engineering design,as well as key technologies for joint operation safety control such as large-scale ship lock linkage safety control,key equipment operation intelligent monitoring,and navigation safety risk prevention and control.The efficient and safe navigation engineering technology system for large-scale ship locks on Xijiang River and the Yangtze River is built.An integrated management and control platform for general aviation dispatching and safety is established.From the aspects of multi-scale dynamics,digital twins,intelligence and localization,and green ecological technology,the development direction of large-scale ship lock navigation operation technology is prospected.

Abstract:In response to the requirements for gradient observation of the Youjiang River waterway regulation project,the methods of gradient observation are discussed.An implementation plan combining longitudinal gradient and river center gradient is adopted,with a focus on demonstrating the leveling measurement method of river center gradient.By setting an adjustable tubular level on a bamboo raft,a leveling observation method is used to measure the elevation of the river center water surface.Combined with the coordinates and other information measured by GNSS-RTK,the accuracy of river center leveling observation is improved.The results show that the leveling observation method can achieve millimeter level observation accuracy for measuring the river center gradient,which has higher accuracy than using GNSS-RTK.

Abstract:Regarding the “runaway ship” accidents during the flood season of navigable rivers in Sichuan Province,it is necessary to reasonably select and construct ship anchorage areas.Based on a mathematical model,this article studies the flow conditions of the river section of Dujiachang Harbor in Minjiang River.The results show that the flow velocity of the main channel of the project section is much greater than that of the anchorage area when the same flow rate is applied.When encountering a 50 year flood,the maximum flow velocity of the main river channel is 6.50 m/s,corresponding to a maximum flow velocity of 1.22 m/s in the anchorage area. As the inflow increases,the growth rate of the flow velocity of the main channel is much greater than that of the flow velocity inside the anchorage area.Under the research conditions,the maximum variation value of the main channel flow velocity is 1.02 m/s,corresponding to a flow velocity variation of 0.19 m/s in the anchorage area.The harbor-type anchorage area of mountainous rivers can effectively meet the requirements for safe docking of ships.

Abstract:The wire rope and buffer cylinder anti-collision device is mainly used in large-scale ship lifts.At present,there is little research on the design method of this type of anti-collision device,and there are certain limitations,which directly affect the layout and design of the anti-collision device.Based on the analysis of energy conversion and spatial geometric relationship during the collision process between ships and collision avoidance devices,this paper proposes a design and calculation method for wire rope and buffer cylinder anti-collision device,including the design and calculation of important parameters such as wire rope tension,ship horizontal travel distance and oil cylinder buffer stroke,as well as the determination of control conditions.The safety and rationality of this design method are verified by comparing the design calculation results with the actual ship test results of the wire rope and buffer cylinder anti-collision device of Xiangjiaba ship lift.The proposed design method can provide reference for the design and modification of the collision prevention device for the wire rope and buffer cylinder anti-collision device of ship lift.

Abstract:To meet the needs of green development,habitat restoration measures have often been taken in water transport engineering construction in recent years to reduce the adverse impact on the environment.Current river habitat restoration measures are mainly the shore slope ecological construction.According to the actual situation of the Wohe River,this paper aims at the “four major Chinese carps”,Jingtu Gorge carp,leiocassis longirostris and benthic organisms,explores the water depth and the flow velocity suitability curves.Based on the habitat restoration model,the paper puts forward in the river shoal-deep trench staggered distribution of habitat restoration measures,and uses the habitat restoration model to study the engineering effect of shallow-deep trough habitat restoration measures under different flow conditions.The results show that the shallow-deep trench habitat measures can improve the habitat suitability of fish and zoobenthos and expand the habitat suitability area.

Abstract:Channel is an important national public welfare transportation infrastructure.In recent years,the contradiction between supply and demand for channel maintenance funds has become increasingly obvious,which has become a prominent problem in China's channel maintenance management.This paper analyzes the basic situation and the main problems of channel maintenance funds investment.The main problems include insufficient scale of channel maintenance investment,unreasonable expenditure structure,and imperfect funding guarantee mechanism,etc.In response to these issues,this paper proposes countermeasures and suggestions,such as enlarging the scale of central and local financial maintenance funds,compacting the responsibility for channel maintenance expenses,promoting the separation of channel management and maintenance funds,and expanding new channels of channel maintenance funds,in accordance with the idea of “consolidating sources and tapping potential,ensuring mechanisms,optimizing allocation,and exploring innovation”.The purpose is to accelerate the construction of China's inland channel maintenance funds guarantee system and steadily improve the quality and service level of channel maintenance.

Abstract:In view of the complex layout of third-line ship lock caused by the numerous buildings around the Qingyuan Hub,this paper identifies a layout scheme by comparing and analyzing the lock location options,structural and space reservation options and by using numerical simulation methods.The scheme includes location on the left bank,double-line ship lock with mutual filling and emptying and structural reservation.Meanwhile,the scheme extends the length of the upstream right permeable diversion dike to 350 m to ensure a reasonable layout.It proposes that the layout of the ship lock should be considered from the perspective of navigable flow conditions,interrelationship with existing buildings in the hub,influence on the structural safety and normal operation of the built buildings,navigation during the construction period,land acquisition and demolition,construction investment,etc.,which is an important guiding significance for the selection of the layout of the ship lock in the case of many surrounding buildings and environmental constraints.

Abstract:As an important navigable reach of the middle and lower reaches of Hanjiang River,after the implementation of Danjiangkou Reservoir and the Yangtze River to Hanjiang River water diversion project,the upstream water duration and discharge have undergone great changes,and the changes of water flow,sediment movement and riverbed are very complicated.This paper studies the regulation plan of Goutou Bay based on the measured hydrology,topographic data in recent years and model test data,it focuses on the analysis of the evolution characteristics of the shoal section,the relationship between water flow and sediment movement and the characteristics of navigation-obstructing and proposes the regulation project.The verification results show that the implementation of the regulation project stabilizes the project reach beach,narrows the width of the middle and low water river,the deep trough is generally scoured and tends to be stable,and the middle and low water river regime can be effectively controlled and consolidated.The research results can provide reference channel regulation of Goutou Bay section shoal and similar channel section.

Abstract:With the joint operation of the two dams and thirteen gates of the Three Gorges Gezhouba cascade hub,the navigation conditions in the upper reaches of the Yangtze River have been greatly improved,the shipping costs of ships have been reduced,and the development of Yangtze River shipping has been promoted.The freight volume has been continuously increasing,reaching a capacity of 100 million tons ahead of schedule in 2011.However,with the rapid growth of freight volume,the problem of ship backlog caused by insufficient capacity of the Three Gorges Gezhouba cascade hub ship lock is becoming increasingly severe,and the problem of ship waiting for lock has become a normal situation.Strengthening the research and construction of anchorage engineering in cascade hubs is an urgent requirement to ensure the safety of ships waiting for gates,carry out safety inspections of ships waiting for gates,maintain the navigation order of ships,and improve the navigation efficiency.Therefore,this article proposes a construction plan for the Three Gorges Gezhouba cascade hub anchorage by sorting out the functional positioning and layout requirements of the anchorage,combined with the progress of scheduling technology and the innovation of methods such as the matching operation of the two dam ship locks.

Abstract:To speed up the construction of dry bulk cargo smart ports,the application of digital twin technology in dry bulk cargo terminals is discussed.This paper analyzes the development trend of automation,information and intelligence in the operation of dry bulk cargo terminals,and points out the current challenges such as explosive growth of data,incomplete data collection.On this basis,the application fields of digital twin in port are analyzed and sorted out,and seven application business fields are proposed based on the content of digital twin model.Centering on the construction route of digital twin in dry bulk cargo terminal,a method of digital twin model construction with data-driven and model-driven as the core is proposed.Combined with the current situation of intelligent construction of dry bulk cargo terminal,the digital twin platform architecture of dry bulk cargo terminal is proposed.This paper selects typical door machine equipment and global typical cases in the port, and elaborates on the practical experience of application,from the micro devices twin build and macro global twin scenario two aspects,so as to provide reference for smart ports development and construction.

Abstract:At present,the berth safety control of domestic liquid bulk cargo terminals still relies on manual experience,which is difficult to meet the requirements of full process,integration and unmanned,and there are many risks in ship berthing and unberthing operations.With the development of specialized and large-scale liquid terminals,safe operation control needs to take more effective measures on the new concept.Based on the refined prediction of waves,this paper proposes a set of intelligent safety management and control technology for liquid bulk cargo terminals to predict the ship motion,and avoids the risk actively.The paper puts forward the concept of ship operational readiness,assigns the index weight to the influencing factors of berthing operation,and builds its safety evaluation model to obtain the criterion of safety at berth.The results show that the application of this technology provides a powerful scientific basis for the decision-making of ship safety operation window period.

Abstract:The excessive deformation of the foundation pit supporting structure seriously affects the safety of the foundation pit and the surrounding buildings.The proved influencing deformation factors have important guiding significance for design and construction safety.Taking the foundation pit project of a deep soft soil lock as an example,we use the finite element software to build a three-dimensional model to simulate the excavation process,study the influence law of the soil parameters,edge load,the reinforcement strength of soil between piles and pile stiffness factors on the deformation of the supporting structure,and use the grey relational analysis(GRA)to analyze the sensitivity degree of each influencing factor.The results show that when the friction angle in the soil drops or the load increases,the horizontal displacement of the pile top increases significantly.The horizontal displacement of pile top to various factors is soil parameters,edge load,soil reinforcement strength and pile stiffness.In the design and construction of deep soft soil foundation pit,attention should be paid to deformation and rheology of soft soil,improve soil strength and to reduce the external load of supporting pile,so as to ensure the safety of foundation pit engineering and surrounding buildings.

Abstract:In view of the problems of low shear strength index of soft foundation in large gap such as fluid mud and silt soil layer,difficulty of anti-sliding stability and settlement control,which can not meet the requirements of closure,this paper studies the closure scheme of fluid mud and fresh silted soft soil foundation of Hengsha Dongtan Circle(Phase 8)project.Based on theoretical analysis and numerical simulation calculation method,it proposes the combined foundation treatment method of drainboard installation in deep mud,thin layer mud gravel replacement and long bag reinforcement at the same gap.The strength of gap foundation soil is greatly improved in the short term and meets the closure requirements.The research results can provide new ideas for construction design of similar projects.

Abstract:To solve the problems of low construction efficiency and uncontrollable quality of the cast-in-situ construction system in ship lock engineering,the prefabricated structures are applied to retaining wall engineering,and the reinforcement cluster connection is applied to prefabricated retaining wall structures.To clarify the mechanical performance of the connection,this paper conducts unidirectional loading tests on the specimens of the connection to observe the failure characteristics and crack development rules.The test results show that the failure mode is small eccentric tension failure,and the failure location is concentrated at the end of the inserted bar.The research results can provide theoretical support for the failure mode analysis and tensile bearing capacity calculation of the cluster connection in ship lock retaining wall engineering.

Abstract:In response to the problems of water facing all sides of the Dongfeihe River lock from the Yangtze River to Huaihe River,complex construction conditions,and one-time formation of the lock chamber wall,this paper analyzes hydrological and geological conditions,and conducts a comparative test of the dewatering well to determine the deep foundation pit dewatering plan and monitoring method.Based on the existing installation methods of steel bar for lock chamber wall and miter gate,this paper analyzes the existing problems,and puts forward some construction techniques,such as integral prefabrication and installation of steel bar for lock chamber wall,fine fabrication and precise positioning of miter gate.The research results made the construction of Dongfei River double line ship lock successfully and improved the safety and quality of ship lock construction.The application of the steel prefabrication technology in the lock chamber wall project further enriches and improves the construction methods and quality of the reconstruction and expansion of ship lock.

Abstract:The soil quality of the dredging project for the 27 #~29# general berths in the Longkou Port Area of Yantai Port is mainly composed of cohesive soil mixed with a small amount of coarse sand.During the construction of this soil quality,the cutter suction dredger is affected by clay pilling and viscosity,which can easily lead to pipe blockage,cutter sticking,and transportation difficulties.The fluctuation of key parameters in the construction operation is large,and the operators control are difficult,resulting in low average production efficiency.This article focuses on the excavation and transportation analysis of cutter suction dredger,determining key construction parameters,optimizing construction processes,and guiding operators in construction.The optimized construction process has increased the construction capacity of the cutter suction dredger for the general berths 27#~29# in the Longkou Port Area of Yantai Port by more than 20%,saving construction costs.