Abstract:Aiming at the problem of construction sequence arrangement of the channel regulation engineering under the high velocity and deep water in the lower reaches Yangtze River，the research of construction sequence principle and regulation effect of the submerged dyke at the left braided channel of Hechangzhou waterway were carried out by combining mathematical model and river bed evolution analysis.The results showed that the diversion ratio of the left braided channel decreased by 9% after the implementation of the submerged dike,and the navigation channels were deepened obviously due to the riverbed scouring of the right braided channel；the flow fields and topographic adjustment were basically in line with the expectations,and the regulation effect was achieved by that of limiting in the left braided channel and deepening in the right braided channel.The results can provide a reference for the construction sequence research of the navigation channel regulation in the lower Yangtze River.

Abstract:To scientifically evaluate the economic and social benefits of the 12.5-meter deep-water channel second-phase project below the Yangtze River below Nanjing,we analyze the economic benefit,macro-benefit,social benefit and environment benefit of the project by building a transportation economic model,an input-output model and a gravity model.The research reveals that significant benefits such as reducing logistics costs,driving regional economic growth,adding new jobs,stimulating fiscal revenue growth,and promoting energy conservation.Thus the strategic significance of the project is fully reflected.

Abstract:In order to ensure the efficient automation of horizontal transport equipment,the ability of the horizontal transport equipment route planning becomes the decisive factor for evaluating the system.Aiming at the problem of how to generate the optimal driving route for horizontal transport equipment in automated container terminals,we make a deep study on port layout,task partition,lane selection,route optimization and other aspects,and propose a scheme of automated guided vehicle operation route planning system.This system clarifies the factors to be considered in route planning,simplifies the calculation logic of path planning system,shortens the running distance of automated guided vehicle,and has important significance for improving horizontal transportation efficiency.

Abstract:The main function of the track system of the fully automated stacking crane is to guide the high-speed operation of the fully automated stacking crane,so as to provide continuous,smooth and less resistance for the large car mechanism good operating conditions and ensure the smooth operation and accurate positioning of the equipment.In order to solve a series of problems caused by uneven settlement of track foundation and deformation of track caused by external forces,combined with the actual situation of Qingdao Port automation wharf project,this paper studies the track system of automated stacking crane from four aspects:track foundation,track type,track fastener and track base.The results show that in order to ensure the reliable operation and efficient loading and unloading of the fully automated stacking crane,the track foundation is required to have basically no settlement,the track and the track fasteners have strong bearing capacity,and the track fasteners and the base have good damping and buffering performance.The research conclusion has reference significance for the design of track system of automated stacking crane in the automated container terminal.

Abstract:Taking Qingdao Port automated container terminal intelligent gate project as an example,aiming at the requirements of business process,logical verification,information filing and port unit supervision,we put forward the requirements of ensuring accuracy,real-time and integrity of information such as container,container truck and container truck driver.Qingdao Port automated container terminal is studied and designed from aspects of plane layout,business process and information collection of intelligent gate,and the solution of intelligent gate information collection system is formed by using the current mature hardware equipment and information processing system.An efficient and accurate intelligent container gate system is designed for the intelligent gate of the automatic container terminal,which provides a theoretical and practical basis for the design and construction of the intelligent gate.

Abstract:As one of the important production systems of the automated terminal,the equipment control system receives the dispatching instructions of the terminal operating system,controls the automated equipment to execute instructions,and feeds back the equipment and instruction execute status.The equipment control system should have the ability to control and coordinate different types of operating equipment comprehensively.Through a series of functional logic and intelligent algorithms,the complex working conditions of the terminal production operations can be realized and the efficiency of equipment movement can be improved,thereby achieving the double effects of improving efficiency and saving energy.The architecture of equipment control system and the design and application of functional modules of each subsystem are introduced,aiming at the difficulties and problems of equipment control system design for automated container terminals.And a set of solutions which can shorten development cycle,improve adaptability and reliability is summarized.

Abstract:For the structures of floating breakwater which are used in practical engineering,we carry out the physical model experiments in the flume to study the dissipation effect of frame-type breakwater in the regular wave,and obtain the relationships between transmission coefficients and relative width of floating breakwaters,the number the row of pipelines and the nominal diameters of pipelines.The results show that the relative width is the main influencing factor for the wave dissipation performance of the breakwater.The rows number of pipelines and the nominal diameter of the pipelines also have significant impact on the wave dissipation.Considering the material and other factors,the model 3(6 rows,nominal diameter 40 mm)is recommended as the type of breakwater.

Abstract:Due to the uneven distribution of water density in space,the flow is affected by baroclinic force,and the velocity profile often deviates from the traditional logarithmic profile in saline-freshwater mixed estuaries.The well-known density flow profile,which is assumed constant eddy viscosity,cannot fit the instantaneous velocity profile.Based on the hydrodynamic equations,we obtain the profile of the turbulent shear stress,which indicates that the distribution of the shear stress is parabolic under the effect of baroclinic force.Then we derive the velocity profile of ebb flow influenced by the baroclinic force through Prandtl’s mixing theory.By comparison with numerical simulation results and experimental data,the proposed equation can correct the deviation between the classical logarithmic and the measurements,improve the fitting accuracy,and obtain the more reasonable fitting parameters.

Abstract:This paper assesses the performance of a floating breakwater with additional wave energy conversion function.According to volume of fluid(VOF)method and finite element spatial discrete method,we establish a two-dimensional numerical wave flume,further study the simulation of wave-double floating bodies interaction based on the study of single float’s hydrodynamic performance,record the wave elevations front and rear of the floating body,and research the influences of the damping coefficient applied on it to the wave transmission coefficient and wave power extraction efficiency.The results show that the damping coefficient has a greater influence on the transmission coefficient and energy extraction efficiency of the double-floating system than that of the single-floating system,so double-floating system is more sensitive to variation of damping coefficient than the single-floating system.Under the same wave condition,the energy extraction efficiency of the double cylindrical float is not simply 2 times higher than that of the single cylindrical float.The ratio of the two is always greater than 2 in the scope of the study,which indicates that the interaction between the floats is positive and conducive to energy extraction.

Abstract:For a pile cap structure,the theoretical method and numerical simulation method are used to calculate the wave force under the action of waves,and the physical model test is carried out to verify the comparison.For theoretical methods,Morison formula is used to calculate the wave force of piles group,and the diffraction theory is used to calculate the wave force of cap；the numerical model is based on Fluent to solve navier-stokes equation,and the source term is modified by UDF to realize wave making,and the numerical water tank is established.The results show that the force of the structure calculated by the theoretical method is slightly smaller than that of the test result because the interaction between the upper and lower structures is not considered；however the numerical model obtained good results when calculating the pile,cap and the overall force,especially when there is wave on the cap,it can also get good results.It is commended that the numerical method should be used to calculate the wave force of pile cap structure.

Abstract:In view of the problem that the extraction parameters of image analysis method fluctuate greatly due to the influence of external environment in the process of image acquisition,we propose a method of introducing reference(marker block)in the process of image acquisition and analysis.This method can reduce the influence of shooting conditions on image processing results,and enhance the contrast between images obtained under different conditions.We study the effect of demolding agent and vibrating time on the appearance chromatic aberration and pore of fair-faced concrete by this method.The results show that the vibration time has a significant effect on the surface chromatic aberration and the pore,a suitable vibrating conditions improving the effect of demolding agent.The parameters of fault pore and fault diameter based on the abrupt change of pore diameter can be used to evaluate the appearance quality of fair-faced concrete and analyze the corresponding reasons.

Abstract:When long period waves act on riprap dike,part of the waves can penetrate the pores between the rocks,thus affecting the harbor mooring stability.Based on the Indonesian project,the variation of penetration coefficient with wave period,wave height and wave type is studied by wave section physical model test.Based on the wave integral mooring physical model test,the corresponding mooring stability conditions of barge terminal and bulk cargo terminal are studied.Combined with the test results,the influence of wave penetration on the mooring conditions is analyzed.The results show that:the wave penetration coefficient of riprap dike decreases with the increase of wave height and increases with the increase of the period；the longer the period is,the smaller the wave height of the ship is allowed to operate；the wave penetration coefficient of long period waves has great effect on mooring and should be taken into account in the design.The test results can provide reference for the design of the wharf behind the riprap.

Abstract:In view of the fact that there is no shear design method for the contact surface of piled wharves prefabricated joint in China’s current code of concrete structure for water transportation engineering,the recommended design methods of American standard ACI318,European standard en1992-1-1,Japanese prefabricated building code and China’s civil code Technical Specification for Precast Concrete Structure are compared and studied.Based on the failure mechanism,the main factors affecting the shear capacity of the fabricated joints are summarized:the roughness of the contact surface,the groove action of the end face,and the pin action of the longitudinal reinforcement.Finally,through the typical design example,the shear capacities of the vertical contact surface of the prefabricated joint for different cods are compared.The Japanese prefabricated building code is recommended for the groove design of the contact surface required.

Abstract:With the increase of labor costs,enlargement of container ships and automation of the handling equipment,and to meet the need of high efficiency,intelligence,safety and green development,we comb the key technology of hardware and software of the container system based on the strategy of process standardization,visualization,material integration,collaboration and intelligent cloud,and design the intelligent system architecture,function and process flow of the target terminal.By sorting out the interaction among subsystems,the practical problem of considering only the impact of each subsystem on the operation of the terminal is avoided.This study aims to solve the problem of decoupling operation of terminal subsystems,and may guide the construction of the container intelligent terminal system.

Abstract:In the regulation project of returning port shoreline to beach,in order to maintain the stability of man-made shore, breakwater should be built in the engineering sea area.Taking the regulation project of returning port shoreline to beach in Rizhao Port Shijiu port area coal storage yard as an example,based on the model of MEPBay,this paper analyses shore stability under various schemes of breakwater,and calculates the sediment movement after the project.The calculation result shows that the beach stability can be maintained by reasonable breakwater location and length.If the breakwater is short,the south side of the beach will be more seriously eroded.Otherwise,the north side of the beach will be more seriously eroded and the south side of the beach will be muddied.

Abstract:In this paper,the model of curtain type sheet pile wharf was established by general geotechnical FEA PLAXIS 3D,and the main parameters affecting the loading of sheet pile wharf structure were analyzed.The results show that:the internal force and displacement of the sheet pile structure are affected observably by the soil parameters；the soil behind the anchor structure can be reinforced in order to reduce the influence of the surcharge load on the sheet piles；the internal force caused by the residual water pressure should not be neglected,and the reliable measures should be used to decrease the residual water pressure；the construction procedure of the sheet pile wharf is important for the structural internal force；the effect of construction procedure should be considered in the analysis of internal force of structure which is conducive to ensure the safety of the structure.

Abstract:In view of the problem of the reconstruction of existing facilities caused by the entry of railway lines,and based on the analysis of the current status of the planned railway line entry area and the operational needs of the port area,we make a technical and economic comparison of the overall layout of the port area caused by the entry of the railway to the port area.Following the principle of “ensuring the operation of the port area,not occupying the existing yard as far as possible,and minimizing the impact on existing facilities”,we propose the recommended scheme 3,which lays a foundation for building a large-scale iron ore sea-rail intermodal transport hub in Ningbo Zhoushan Port.

Abstract:To explore the effectiveness and technical features of inspecting the wharf joint underwater by multi-beam bathymetric system,we carry out an underwater field experiment on caisson quay wall of the wharf being built.According to the characteristic of the object,we improve the configuration and installation mode of the multi-beam bathymetric system,and analyze the point cloud extracted from the data collected,and give the verification for the width of the joint by underwater photography.The results show that the resolution of inspecting joint width is related to ship speed,launch frequency of beam,detection distance and other factors,and steady navigation attitude and uniform speed should be ensured to guarantee the quality of inspection.This system can obtain three-dimensional point cloud data underwater,which can directly reflect the overall shape of the joint.It can provide a new method for inspecting wharf joint underwater.

Abstract:Aiming at the setting conditions and theoretical calculation of storm water infiltration equipment,we analyze and study the domestic and overseas codes.Combining with the implement scheme of infiltration equipment of an overseas port engineering,we calculate the infiltrated water volume and water storage of infiltrated pipe trench,infiltrated chamber and infiltrated channel according to the rainfall intensity at the different rainfall time,and determine the economical dimensions of infiltration equipment.The engineering example shows that on the condition of the rainfall is no more than 91 mm/h and the soil permeability is no less than 0.5 mm/s,this infiltration equipment has obvious advantages in storm water discharge.

Abstract:Aiming at the problem of insufficient ship service capacity in the middle reaches of the Yangtze River,we study the variation characteristics of the capacity and composition of the passage vessels to improve the channel service level and shipping economic benefits.Through field investigation and statistical analysis,it is found that the average annual decline rate of total flow of service vessels in the middle reaches of the Yangtze River is 1.8%,the average annual increase rate of the total net load tonnage is 9.0%,and the average annual large-scale rate of vessels is 11%.With Chenglingji section as the boundary,the ratio of average daily flow of vessels in the upper and lower reaches is 12.2,the proportion of vessels with more than 5,000 tons in the upper reaches grows continuously,and the proportion of vessels with less than 5,000 tons is constantly increasing.The proportion of vessels with more than 10,000 tons in the following sections grows continuously,while the proportion of vessels with less than 10,000 tons declines continuously.It can be seen that with the improvement of waterway conditions in the middle reaches of the Yangtze River,the large-scale vessel becomes more significant,and therefore higher requirements are put forward for the waterway regulation.

Abstract:The hydrology and sediment environments in the ocean area near the project are analyzed according to the measured data firstly.In view of the characteristics of irregular coastline,complex terrain,numerous islands of the sea area,a two-dimensional model of wave,tidal current and sediment transport is built and verified to study the tidal and sediment transport law after implementation of the first phase channel project,analyze the tidal current characteristics,cross flow in channel,annual deposition and possibility of sudden deposition under the extreme weather condition.The main conclusions are as follows.The current flow in the channel is smooth and the cross flow is not large；the annual siltation intensity ranges from 0.0 to 0.62 m/a,and the annual siltation volume is 1.773 million m3；under the extreme weather conditions,the bottom sediment is in the form of floating mud.The current flow in the channel is smooth and the dynamic conditions are strong.It is difficult for the floating mud to remain in the channel for a long time,but attention shall be paid to its short-term obstruction.

Abstract:The navigation condition of the fluctuating backwater zone of the Three Gorges Reservoir should improve its level from 3.5 m to 4.5 m in order to meet the development requirement of the Yangtze River economic belt,and the bed load transport at the reservoir head is the problem must be dealt with.Based on the 2D hydrodynamic-sediment transport numerical model for the Three Gorges Reservoir,the deposition and scouring process of the river reach from Chongqing to Fuling was simulated according to the water discharge and water level record from 2009 to 2016.The results were in good agreement with the field measurements for the sedimentation distribution and gravel bed load transport rate at from Chongqing to Fuling,illustrating the capability of the two-dimensional model to predict the bed load transport process in the Three Gorges Reservoir.The 2D numerical model was then applied to predict the change trend of the river reach in the next 30 years and analyze the distribution of the sedimentation,the density of the gravel bedload transport and its characteristics to investigate the influence of the gravel bed load behavior on the navigation condition in the key river reach.The results can provide technological support for the 4.5 m level waterway regulation in the fluctuating backwater zone in the Three Gorges Reservoir.

Abstract:In recent years,due to the influence of clear water discharge from the Three Gorges Dam,the change of Shazhou waterway is not conducive to navigation.According to the management planning and navigation requirements for the Yangtze River waterway,the field data of Shazhou waterway were analyzed and the regulation idea for Shazhou waterway was put forward.Furthermore,a series of the fixed-bed model tests were carried out to analyze the influence of different schemes on the division ratio of left branch,and the movable-bed model test was carried out by selecting the scheme with better flow structure.Through the typical annual movable-bed model test,the riverbed erosion and deposition,local scour,etc.were analyzed,and the recommended schemes for Shazhou waterway regulation were determined:3 beach protection belts with hook heads were arranged at the beach head of the heart of Huangzhou shoal,2 extended latent locking dams were arranged in the left branch,and the height of lock dam crest was 4.59 m.Relevant achievements can provide technical support for engineering practice.

Abstract:In view that the river’s ecological landscape is affected by the regional conditions,we carry out an analysis and evaluation of it from multiple aspects including the river’s ecological water quantity,meandering state,connectivity,as well as landscape construction based on a typical seasonal meandering river,the Yangchangzi River.The result reveals that the meandering state,connectivity,and landscape presentation of the river are all poor and it is lack of ecological landscape. So,we put forward the measure of constructing the ecological landscape under the prerequisite of guaranteeing the river’s stability and health and considering the surrounding land utilization:by maintaining the ecological base flow and constructing the bank habitat to ensure the stability and health of the river,by optimizing the rural road and constructing the ecological landscape to realize the windbreak & sand fixation,water conservation and protect species diversity,so as to strengthen the connectivity and ecological balance of the river,create an ecological corridor,optimize the ecological landscape and improve the environment.

Abstract:Plane valve is the commonly used valve type for ship lock.Under the effect of medium-high head,the valve lintel,root edge and gate slot are easy to produce the cavitation corrosion and the derrick of the valve hoist is easy to be compressed and unstable.Based on the water transmission model test,the problem of cavitation of the lintel,root edge and gate slot has been solved using a natural ventilation method .There are some misaligned holes in the back board of the valve and the “∧” stress flow channel is retained,which can meet the nature ventilation,and at the same time improve the strength and rigidity of the valve so as to avoid the formation of pontoon and ensure the installation of the main roller and side sealing.Nylon blocks are set behind the top sealing to extend the time that the top sealing separating from the lintel,which can prevent the top water flow from being interfered with the bottom water flow prematurely and reduce the pressure fluctuation and sound vibration.Through the upstream face setting of the bottom sealing，the uplift force in valve closure is reduced,and the derrick of the valve hoist is always in tension without setting the counterweight;which avoids the instability of derrick under pressure and achieves the normal operation of the valve with smaller opening and closing force.

Abstract:The regulation works of the Jialing River waterway from Caojie to the estuary were implemented in stages.The regulation effect of some reaches was not as expected,and the navigation conditions were still poor.In view of the key navigation-obstructing shoal of Banjiubei and Erlangtang in the Jialing River waterway from Caojie to Beibei,a depth averaged two-dimensional model as well as field observation are adopted to analyze the navigation condition of the Jialing River waterway from Caojie to Beibei.Waterway and shoals characteristics,waterway regulation and the regulation effects on the river reach are summarized.In addition,the flow regulation requirement of Caojie Hydropower project for navigation purpose and the corresponding guarantee rate are put forward.The results show that though the waterway from Caojie to Beibei in the Jialing River has been systematically regulated in recent years,navigation flow condition has been improved,but influenced by terrain changes year by year,erosion and deposition in the channel changes significantly,already cannot meet the requirement of the channel dimensions Ⅲ level at present.Under the current topographic condition,the minimum discharge requirement of Caojie Hydropower station for grade Ⅲ channel dimensions is 1 391 m3/s.

Abstract:In order to realize the initial passage of 6 m water depth on the Wuhan to Anqing section of the Yangtze River main line,waterway regulation is needed.Zhangjaizhou waterway is one of the important shallow channels in the middle and lower reaches of the Yangtze River.Based on the research on the regulation of built waterway and according to the basic data of prototype observation of Zhangjiazhou waterway,we analyze the condition of 6 m-depth waterway and its changing trend in depth,and propose the regulation idea,principle and parameters.Combining with the physical model experiment to study the regulation,we predict the evolution trend of the watercourse and carry out the effect experimental study on the regulation program.The research results show that,with the implementation of the regulation program,the condition of the 6 m-depth waterway of the watercourse can be basically achieved.

Abstract:For the influence and treatment of the frequent scouring and siltation of the straight river reach from Xinzhou to Jiujiang on the navigation channel,we probe in to the relationship between the change of the shoal and the navigation conditions in the shallow section of the river based on the analysis of measured data.The results show that the shoal channel conditions of the river section relate directly to the scouring and siltation of the shoal:when the shoal is complete and the position is on the upper side,the navigation condition is better;otherwise,it is worse.On this basis,we put forward the regulation ideas and measures for improving the 6 m channel of the river section to enhance the control of the shoal body,limit the development of the coastal trough,and appropriately increase scouring in the shallow area.

Abstract:The dam site of the Qingshui River Panghai navigation and power junction project is in narrow river section of mountainous area without the working condition that ship lock and factory building are both constructing at the same time.Combining with the characteristics of large flood discharge in mountainous river,short duration of flood and high ratio of flood to dry water,we fully consider the principle of early commissioning of power generation of factory buildings,and propose the design scheme to adopt staggered diversion and overflow cofferdam.In the first stage of the design scheme，we enclose factory building of power station and part of the sluice.In the second stage,we adopt the discharge method of the overflow cofferdam and the built sluice at the same time.We establish a 1100 normal fixed bed physical model of the dam section to verify the diversion effect of the design scheme.The results show that the design indexes of scheme can meet the requirements.It can provide the conferences for the similar projects.

Abstract:Based on the analysis of the problems of deformation and damage to local areas of YR1 bank of Yanziwo waterway in the middle reaches of the Yangtze River,we propose a scheme of reinforcing YR1 bank with block stones,which can achieve the goal of restraining scouring,stabilizing key parts and preventing continuous scouring of beach protection structures.The research results can provide reference for similar beach protection structures in the middle reaches of the Yangtze River.

Abstract:Channel survey covers a wide range,a long distance and spans provinces,but CORS system survey cannot span provinces.In view of this problem,this paper discusses RTK measurement,CORS system measurement and Qianxun CORS.The Qianxun FindCM measuring method has centimeter-level positioning accuracy,with full coverage,seamless connection and high overall accuracy,and can meet the requirements of large-scale,long-distance and span-provincial channel survey.It provides a new method for similar engineering survey.

Abstract:Jiepai lock is located on Xinjiang waterway,thus ship lock’s reconstruction or extension is necessary in order to meet the change of navigation conditions in Xinjiang River.In view of the selection problem of gate level layout scheme,different schemes are analyzed and compared,including land expropriation,construction impact on navigation,impact on existing buildings,construction difficulty,investment,water flow conditions and so on.After analysis and comparison,the scheme of rebuilding ship lock is finally determined whose ship lock center line is 22.7 m offset to the river side from the original ship lock axis.In this paper,numerical simulation and physical model experiments are carried out to study the flow conditions in the entrance area of the approach channel to adjust the unfavorable flow conditions,and the layout requirements of hanging plates according to the flow experimental conditions are put forward.This research method can be used for reference in the selection of lock location schemes for ship lock reconstruction projects.

Abstract:In view of the problem that discrete topographic data or empty area of topographic data existed in the waterway engineering results in creation of the topographic surface which is not smooth enough and occurrence of deep concave or protruding,we propose to use Kriging interpolation method to directly interpolate and fill the discrete topographic data of waterway area,and then build the model of waterway topographic surface by BIM technology.The result shows that the terrain surface model generated by Kriging spatial interpolation of discrete terrain data is closer to the actual effect and the trend of terrain,and can truly show the current three-dimensional terrain of waterway,and it may serve as reference for surveying and mapping units to carry out BIM work.

Abstract:In view of the advantages of BIM technology in waterway construction,we introduce the Autodesk series BIM software into the inland waterway design,realize the parametric design and visual display of inland waterway dredging and revetment engineering by using Civil 3D,Subassembly Composer and Infraworks,carry out the secondary development of cross-sectional customization,label customization,template file customization,etc.,and put forward a three-dimensional forward design and visualization demonstration technology suitable for inland waterway construction.

Abstract:In order to study the mechanical characteristics of the cantilever retaining structure in the excavation process of the foundation pit,we combine with the deep foundation pit engineering of a large second ship lock,analyze the displacement of the row pile and the variation law of earth pressure during the excavation process by the centrifugal model test,and apply the numerical simulation method to verify and analyze the distribution and change of bending moment and shear force of the pile body during excavation.The results show that the earth pressure on the retaining side of the pile foundation is close to the static earth pressure state in the consolidation period,the theoretical value of the active earth pressure is close to the second foundation pit excavation,and the earth pressure is gradually reduced during the foundation pit excavation process.Due to the influence of foundation pit excavation,the soil on the side of the foundation pit is destroyed by the support pile extrusion,the earth pressure is redistributed,and the earth pressure in the passive zone at the same depth is greater than the earth pressure in the active zone,the bending moment of the pile body is due to the earth pressure.The “C” shape distribution law is presented by the influence of the difference,and the shear force exhibits the “S” shape distribution law.The maximum bending moment and the shear force abrupt position are moved downward toward the pile body as the foundation pit is excavated.

Abstract:Composite foundation or large excavation to fill thick rubble bed is always chosen when the gravity wharf is built on the soft foundation before,which will take more cost and more time.Based on the expansion project of Abidjan port in Cote d′Ivoire,the design rationality of deep water and thick replaced sand foundation is analyzed theoretically according to site condition.The site construction and the subsequent settlement and displacement development of caisson and breast wall have proved the feasibility of the construction method and the effectiveness of the treatment effect.The practice shows that the deep water and thick replaced sand foundation has the advantages of low cost,short construction period,less occupied equipment,etc.,and the vibro-compacted foundation is uniform and stable,with high bearing capacity and small settlement in the later period.This research can provide reference to the design and implementation for similar project.

Abstract:Aiming at the problem that the vertical scour shear effect of drag head high-pressure water of trailing suction hopper dredger(TSHD) is not obvious,we design and modify the high-pressure water jet nozzle of drag head,put forward a method that adopt installation of high-pressure jet nozzle of oblique flush type inside the trapezoidal wear-resistant block to increase the shear failure of soil by high-pressure water,and analyze the improvement effect of before and after.The results show that when the jet pressure is large enough,the method can effectively shear the mud surface to achieve the effect of the clods to break away from the mud layer,and improve the construction efficiency.The method can provide references for similar projects.

Abstract:Binhai port in Yancheng is seriously back silted by sediment.The port area needs to maintain dredging of water depth all year round to maintain safe navigation depth.The high water content of dredged sediment and lots of interference factors during construction lead to that the construction efficiency is low and the maintenance cost is high.In view of the maintenance of water depth in the port area,we analyze the back silting law and the required navigation depth of the ship,combine with the water depth dynamic maintenance technology such as the application of appropriate depth for navigable,the well proposed rising of depth,and optimize the time node for maintaining dredging in the port area and the key construction parameters of cutter suction ship.It can effectively reduce the number of maintenance dredging while ensuring the safe navigation of the ship,improve dredging efficiency and reduce maintenance costs.

Abstract:It is easy to paste cutter head and to block pipe when the cutter suction dredger is dredging typical cohesive soil,dense silt and calcareous tuberculosis mixed soil.Relying on the 300,000 tons waterway dredging project in Lianyungang Port,we analyze the ununiformity of mixed soil,and derive the calculation formula of characteristic index of mixed soil and dredging volume in Lianyungang Port from the perspective of the correlation between typical soil dredging specific energy and ship construction parameters,which can predict the dredging volume of complex soil.The results show that the typical mixed soil of Lianyungang Port is made up of cohesive soil,dense silt and calcareous tuberculosis,and has various soil characteristics .This soil dredging volume of the“Tianhu”cutter suction dredger is predicted by the derivation formula,and the relative deviation of the predicted value is below 15% compared with the measured value,the reliability is very good.It can provide conferences for the similar projects.

Abstract:The soil information is great significance to the control strategy of the excavation and loading process of the suction hopper dredger,but the suction hopper dredger cannot directly sense the soil information.We conduct linear visualization and feature analysis of nonlinear coupled dredging data based on real ship data through principal component analysis(PCA),and study the correlation between soil information and working condition information.The support vector machine (SVM) is used to construct the classifier to classify and identify the soil conditions.The results show that the method can effectively identify different working conditions,and realizes the indirect perception of soil information.