Abstract:In order to investigate the turbulence characteristics of the flow around large scale granular mixtures,we apply a cube,a sphere and a tetrahedron with the same height of Δ=5 cm to generalize the reef shape in gravel-bed rivers respectively,and study the statistical characteristics of fluctuating velocity,and the turbulence parameters such as turbulence intensity,Reynolds stress and turbulent kinetic energy based on 6 sets of data measured by acoustic doppler velocimeters in an uniform turbulent open-channel flow.The results show that the statistical parameters of fluctuating velocity are closely related to the shape of large scale granular mixtures,the vertical distributions of standard deviation σ+u and kurtosis Ku are more uniform,the longitudinal distribution of σ+u increases first and then decreases,and kurtosises on the vertical line at upstream and downstream sections are larger than 3,most of which present a high narrow peak.The skewness Sk at upstream section is basically negative,while Sk at downstream sections gradually becomes negative with the increase of water depth.The vertical distributions of longitudinal turbulence intensity T+u around the 3 kinds of large scale granular mixtures are more uniform and T+u along the longitudinal sections increases with the increase of Froude number Fr.T+u of the cube is the largest,T+u of the sphere is the second,and T+u of the tetrahedron is the smallest.The vertical distributions of Reynolds stress R+ around the 3 kinds of large scale granular mixtures increase gradually from the free surface to the bed.The vertical distributions of turbulent kinetic energy E+ around the 3 kinds of large scale granular mixtures are small at both ends and large in the middle.R+ and E+ have the maximum value near the 2Δ section of the downstream.The hindrance area of large scale granular mixtures is positively correlated with the intensity and extent of its influence on the downstream flow.

Abstract:Using numerical simulation method,we establish two-dimensional irregular wave numerical model based on the software FLUENT,and research the mechanism of wave slowly-varying force on the permeable beam-plate structure.Through simulating typical cases of wave slamming on beam-plate structures,we use low-pass filter method to obtain the slowly-varying sections from the up-lift force signals,and verify the models by comparing the experimental data with the simulation result.We analyze the influences of the three parameters on the slowly-varying force,such as wave steepness,relative clearance and relative structure width, and propose the empirical slowly-varying force formulas based on the simulation data and existing research results,which can provide reference for the similar projects.

Abstract:Many formulas for calculating mean overtopping are based on physical model experiment,but lack validation of field prototype overtopping data.Based on Hengsha east shoal siltation circle project (Phase V) for permissible overtopping prototype observation test,we collect the related experimental data for researching.Using graphic statistics,factor analysis and nondimensionalization,we analyze and compare the factors in the Van der Meer formula and code for design of sea dike project formula based on the recorded data,and evaluate them.The results show that the calculated value of the Van der Meer formula is smaller than the measured data,but the calculated value of the code for design of sea dike project formula is consitent with the measured data,which can basically satisfy the calculation of mean overtopping value of the normal incidence waves of mound breakwater in Shanghai area.

Abstract:In order to solve the problems of blockage pump and harrow,which seriously affect the construction and production in Blank Project in Russia,we study the passage capacity of the dredge pump and the grating of the rake head.Based on the similarity principle of mud pump,we analyze the aspects such as the size increase of spherical channel of mud pump,the influence of impeller cutting on the performance of mud pump,blade cutting length calculation,impeller cutting operation,and adjust impeller diameter of mud pump to suit complex working conditions of multi-rock sediment.Through the methods,the low construction efficiency of the small flow impeller under the multi-rock sediment is solved,the volume of passing pump of single ship increases 44% averagely,the loading productivity increases 17% averagely,and the cycle productivity increases 11.5%.

Abstract:This paper reviews the process of determining the design working life of port engineering structure in China at present,compares and analyzes the regulations for the design working life of the domestic engineering structure and foreign port engineering structure,summarizes the design regulations of domestic and foreign structures with a design service life of 100 years,analyzes the factors to be considered in increasing the design working life of the port engineering structure,and discusses the work to be carried out to improve the design working life.The research shows that it is technically feasible to improve the design working life,but it is necessary to carry out research work on the value of action,structural reliability analysis,durability design method,etc.Referring to the regulations on the design working life of other domestic industries and foreign port engineering structures,and considering the current situation of port use in China,it is proposed that the design working life of permanent port buildings should still be 50 years,while it can be more than 50 years according to the requirements of owners for particularly important port projects.

Abstract:Combining with a reconstruction project of bulk cargo berth in a port area in China,this paper studies a new steel tubular-sheet pile structure produced by restructuring the high-pile wharf by a numerical analysis.A comparison between the numerical computing results and the theoretical results of a conventional type of sheet-pile wharf under earth pressure is made firstly to verify the accuracy of this numerical method.Then by choosing different 3D models which are built to study the soil boundaries,the influence on the wharf structural stress with respect to soil boundaries is analyzed.Finally,a 3D numerical simulation on the structure which is under the operating load is carried out to analyze the stress and displacement of the structure.It is discovered by numerical simulation and theoretical analysis that the boundary effect of soil can be neglected when the soil boundary reaches 60~80 m in this 3D numerical model.In addition,under the structural surface load,the earth pressure and the horizontal displacement produced by earth pressure of the new structure are less than those of the conventional sheet-pile wharf structure.

Abstract:According to the actual needs of Hong Kong artificial island engineering of the Hong Kong-Zhuhai-Macao Bridge,various breakwaters are demonstrated.The container floating breakwater is specially designed by numerical simulation and three-dimensional potential flow theory.This kind of breakwater is very effective in wave dissipating and low-cost,making the construction of large-diameter cellular steel sheet piles possible.Most parts of the container floating breakwater can be processed by waste materials in line with the green development.Its structure is simple and easy to recycle for the characteristics of fast installation,quick transferring and rapid disassembling.The container floating breakwater achieved satisfactory application effect in Hong Kong artificial island engineering as a temporary sea wave protection structure and is applicable widely.

Abstract:To study the differences of mooring forces in Chinese and British standard,we analyze the mooring force in different ship types and wind(current) angles by comparing JTS 144-1—2010 Load Code for Harbor Engineering with British standard BS 6349-1:2000.The results show that the wind force of container ships calculated by Chinese standard is smaller than that by British standard,while the wind force of oil tanker is larger.The current force of container ship calculated by Chinese standard is smaller than British,and so is oil tanker except when the angle of the current is 90°.The conclusion can be used as a reference for design of overseas project.

Abstract:Vertical wall wharf deck elevation can be determined according to the flood degree in the Chinese standard.However,in the design standards of Britain,America and other foreign countries,it is proposed that the design water level,safe operation of loading and unloading equipment,and the degree of submergence should be taken into account in the elevation of wharf surface.Among them,the degree of inundation of wharf surface should be the main factor to be considered.This paper takes the mean overtopping discharge as the criterion for classifying the degree of inundation of wharf surface,and introduces calculation of the mean overtopping discharge.Based on this,the calculation method of vertical wall wharf deck elevation is proposed and compared with the calculation methods in domestic and foreign codes.This method has practical reference significance for wharf design of the same kind and also for the control of operation safety standard of wharf.

Abstract:The Mononobe-Okabe equation is widely used for determining seismic earth pressures,but it is incapable to calculate some earth pressures under limited conditions,such as the stratified soils which include sand and clay behind the sheet pile wall.There is no uniform rule for this calculation in Chinese and international codes.We summarize calculation methods for seismic earth pressure of stratified soil,and find the differences between Chinese and international codes.Therefore we propose the generalized limit equilibrium method based on the previous studies,obtain the calculation method for seismic earth pressure of stratified soil by SLOPE software at high-earthquake zone,and verify the method by an abroad marine project.It can provide reference for the similar projects.

Abstract:Normal line-type arranged sloping wharf for passenger transport in mountain river has huger engineering amount of water area and higher investment,and has adverse influence on river channel flood and navigation safety.We propose a comb-type sloping passenger wharf combination arrangement by main ramp and assistant ramp,realize that ships berthing grade and sublevel in mountain river of great water level difference,and solve a series of limitations that sloping passenger wharf arranged normally in high steep terrain and narrow river.Through comparative analyzing with normal sloping passenger wharf,comb-type sloping passenger wharf has stronger adaptability in terrain feature of mountain river,also can effectively reduce occupancy of water area when ships berthing and construct difficulty,and save project investment.

Abstract:For the cylinder gravity wharf,there is not a clear definition and mature design calculation mode yet,and it is lack of practical project and the renovation is difficult.Thus,based on Shajiao C power plant coal unloading wharf structure renovation project,we adopt the scheme of setting the reinforcement grid around the column cylinder and erecting formwork outside,using the existing cylinder based to implement the underwater casting of the high-performance concrete structure,and enlarging the cylinder diameter and self-weight to deal with the problem of the lack of overall anti-sliding and anti-overturning stability and realize the wharf’s upgrading renovation.After completion of this project,the scheme shows benefits of less impact on the normal operation and structural integrity and controllable construction progress.

Abstract:Instead of combustion power generation,onshore power supply system gives an alternative electricity provision for cruise ship which is moored at the terminal.According to the development demands and trends of onshore power supply,this paper expounds functions and configuration characteristic of onshore power supply system,sums up the composition of shipshore side subsystems and the key technologies such as high-power static frequency converting,phase-locking,paralleling load transfer,cable tension detection,etc.This paper also provides different sorts of subsystem applications as reference to determine the entire proposal for Nansha cruise liner terminal,comes to a conclusion that high-high frequency converter with mobile cable system proposal is compatible.The advantages of this proposal are compactness,reliability and compatibility for connection.

Abstract:An Abu Dhabi port is proposed to modify existing container yard layout form according to its own development needs.The large live load is applied to the constructed rainwater drainage pipelines after reconstruction project.This paper analyzes that whether the rainwater drainage pipelines are damaged or reinforced after reconstruction project,and apply the American standard to calculate and check for GRP pipes deflection deformation.According to the calculation results,the existing GRP pipes can meet the demand of the yard after transforming except any reinforcement measures.

Abstract:Beach body is an important part of the river channel，which plays an important role in stabilizing dry channel and controlling waterway pattern.Therefore,it is particularly important to protect and control the beach during the course of waterway regulation.Based on the middle reaches of the Yangtze River channel,through the generalized model test of the unsteady flow,the acceleration of water flow at different positions on the side beach body was observed,the force on the side beach and the reason for erosion were analyzed,and the transverse and longitudinal distribution law of water flow on the side beach and the change characteristics of the side beach easy to be scour were obtained.The research results have certain theoretical guiding value for the regulation of the side beach guarding project in the middle reaches of the Yangtze River.

Abstract:In view of the settlement and collapse occur easily at riprap spur dike,the prototype observation is carried out for the riprap spur dike used in the waterway regulation at Longxu channel of the Xijiang River and Jilongzhou shoal to investigate the main influential factors on the stability of the spur dike body.Based on the comparison and analysis of sediment movement prototype,this study found that,the scouring damage of the spur dike foundation is the main factor that causes dike body’s instability.To enhance the ability of preventing erosion,the spur dike foundation should construct with sandbag or gravel or stone slag.The result may serve as referenced technology for waterway regulation on the riprap spur dike in the sand shoal.

Abstract:Based on the physical model of the Dongxikou gravel beach in the upstream of the Yangtze River,a series of experiment on the characteristics of annual gravel transport were conducted.According to the measured data of the gravel transport under different hydrodynamic conditions,the velocity of the gravel is established from the dynamic mechanism.The 2D numerical model is improved considering the above research results,and then applied to simulate the process of the gravel transport in the Dongxikou gravel beach.The calculated distribution of gravel transport and the process of sediment scouring and silting are compared with the measured values,and the track of gravel walking is basically consistent with the sand walking in the channel.It is shown that the improved two-dimensional gravel model can reflect the characteristics of gravel transport in the river,and can provide theoretical and data support for solving the sediment problem in the upstream of the Yangtze River and waterway regulation project.

Abstract:The Dayuandu navigation power junction is designed to build up the fish path,which is limited by the general layout conditions of the hub.The entrance of the fish way is arranged in the tail water of the power station,the construction is difficult and the investment is big,and there is a serious risk of safety.To ensure the safety,save the investment and meet the requirements of the fish path,a two-dimensional hydrodynamic numerical model is established using SMS-RMA2 model to simulate and get the flow field map in a certain range under different operating conditions in the downstream of the axis of the hub dam and to provide a reliable reference for the determination of the proper fish path entrance in slightly curved braided reach where the dam is built.In order to improve the effect of the fish path,it is suggested to set up the electric fish screen and the sound & light of sprinkler water on the upper side of the inlet of the fish path,so as to help fish find the entrance of the fish path as early as possible.

Abstract:The north operation area of Lanshan port area in Rizhao Port is planned to add LNG wharf,and three plans for the layout of supporting waterway and breakwater project are put forward.Numerical simulation method is used to calculate the flow velocity of the harbor basin and channel under different schemes,especially at the entrance.The calculation results show that:after the construction,the velocity of each point in the harbor basin decreases under the protection of breakwater;under the influence of the overtopping action of the breakwater,the cross flow velocity at the entrance position reaches the maximum;in scheme 2,the flow rate is relatively small and the duration of flow rate greater than a certain value is relatively short.On the basis of scheme 2,a section of breakwater is optimized to be a diversion breakwater.As a part of water can be passed through the diversion breakwater,the cross-flow of channel near the breakwater head is reduced.

Abstract:For the problem that the embankment reserved settlement after construction cannot be predicted accurately in Yangtze estuary soft soil area，a series of one-dimensional consolidation tests were conducted to study the consolidation and secondary consolidation characteristics of silt soft soil in the Yangtze estuary,and to explore compression index,secondary consolidation coefficient and the relationship between the coefficient of secondary consolidation of soft soil and load.The results show that the compressibility index of soft soil in the Yangtze River estuary is smaller than that of typical Shanghai soft soil.The soft soil in this area has obvious secondary consolidation characteristics,and the secondary consolidation coefficient of silt soft soil in the Yangtze estuary is 0.01~0.025.The secondary consolidation coefficient of soft soil first increases and then decreases with the increase of load.A method for predicting settlement of embankment after construction considering secondary consolidation is put forward.The results of the test and the settlement prediction method after construction have certain guiding significance for settlement analysis of embankment after construction in the soft soil area of the Yangtze estuary.

Abstract:Aiming at the problems of selecting design parameters of dynamic compaction and monitoring of dynamic compaction construction in overseas port construction projects,this paper compares and analyzes in detail the Chinese,European and American codes and the manual of dynamic compaction suitable improvement soil,design parameters and construction monitoring.By comparison,it is found that the biggest difference among Chinese,European and American codes and manuals on dynamic compaction method lies in the design concept.Energy method is widely used to design construction parameters in Europe and America,while in China,the selection of construction parameters is guided by the reinforcement effect after dynamic compaction.

Abstract:Taking the rock foundation of the second stage of Guoyuan Port as the prototype,we carry out axial compression test of six steel casing-reinforced concrete short column structures and two concrete-filled steel tube columns.Based on ABAQUS finite element software,we take the thickness of steel casing,reinforcement ratio and stirrup ratio as parameters to analyze.The results show that the steel casing and the stirrup have restraint effect on the core concrete in the steel casing-reinforced concrete short column structure,and the double restraining effect is obvious.The restraining effect of the steel casing and the stirrup on the core concrete can effectively suppression of cracks in concrete causes the steel casing to have higher bearing capacity,plasticity and toughness than conventional steel tube concrete structures.The restraining effect of stirrups on concrete has significant influence on the bearing capacity,ductility and ductility of steel casing and reinforced concrete short columns.With the decrease of the spacing between stirrups,the bearing capacity and ductility of the components are increasing obviously.

Abstract:In the port construction in some areas where is lack of stone materials,conventional stable granule materials are often used for the base course of storage yard,and thus a lot of stones are needed,resulting in high construction cost.In order to make full use of local resources and save the investment cost,we carry out a research on the application of cement-bonded sand for the base course of the storage yard.Based on the French standard,and using the required sedimentary sand or granitic sand decomposed by impact as raw material,we take CBR value as the main design control index and strength standard of the cement-bonded sand,use the road mixer for field mixing and construction,and implement the test and verification of all indicators in the test section.The results show that the cement-bonded sand can be selected as the base course material for port storage yard in the area with limited resources,which could effectively solve the problem of stone shortage in the project site.

Abstract:In order to study the effect of cross-section stiffness of composite materials on the performance of concrete filled steel tubular columns under low cycle cyclic loading,three concrete filled steel tubular columns were tested under low cycle cyclic loading using concrete filled steel tubular columns in the second phase of Guoyuan Port Project as prototype.Physical model tests were carried out to study the effects of steel tube thickness on energy dissipation,bearing capacity,strength degradation,stiffness degradation,ductility and deformation capacity of concrete filled steel tubular columns.The experimental results show that the energy dissipation coefficient and the equivalent viscous damping coefficient of the specimens decrease with the increase of the thickness of the steel tube,and the energy dissipation capacity of the specimens decreases.The smaller the thickness of the steel tube is,the better the energy dissipation performance of the concrete filled steel tubular column specimens.The thicker the steel tube is,the stronger the restraint effect on core concrete,the weaker the strength degradation and the better the plastic deformation ability of the specimens.The thicker the steel pipe,the stronger the restraint effect of the outer steel pipe on the core concrete and the higher the horizontal bearing capacity.

Abstract:In order to solve the problems that the tip resistance of the cone is too large to be touched in the static sounding test of some strongly compacted sandy soil foundation,and how to choose correct dynamic compaction sand surface evaluation indexes,through the dynamic compacted sandy soil foundation reinforcement effect test results analysis and test results data regression methods,it is clear that the static penetration test and the standard penetration test are consistent in evaluating the effect of consolidation of compacted sand foundation,however,the correlation between the secondary deformation modulus and the test results of the foundation coefficient is poor and cannot be replaced.

Abstract:It often regards as a connection way to connect the tubular pipe and the upper structure of wharf in the deep sea engineering.The width,the thickness and the distance among the shear keys are treated as important factors to decide the capacity of it.The distance among the shear keys is a very significant factor affecting the force mechanism especially in the case of multiple keys.At present,there is no systematic conclusion in the relevant specifications in China.We adopt ABAQUS software to establish the axial force model of 14 section three-dimensional steel tubular pile,and verify by Gebman test.The results show that the stress sensitive area is from 75 mm to 200 mm for the two shear keys,and from 100 mm to 150 mm for the three shear keys.As the number of keys increases,the sensitive region is compressed.

Abstract:The foundation engineering construction of a blast-filled ground is characterized by high cost and difficulty of building construction.According to the foundation treatment and foundation pit engineering tests of the start-up area of the eastern part of Taizhou new district,the geological condition of a blast-filled ground and different vacuum preloading treatment schemes of the shallow and medium-thick fill of dredged silt foundation are considered.In addition,analysis of stability and total cost of foundation pit indicates that not only the vacuum preloading treatment scheme of the medium-thick fill is conducive to the support and excavation of foundation pit,but also the total investment in the project is greatly reduced.The conclusion shows that it is necessary to combine foundation treatment with the planning of underground space from the point of view of the follow-up construction and the integrity of engineering.

Abstract:The method of underwater deep cement mixing is a newly adopted and increasingly developed technique of underwater foundation treatment in China.Based on the marine projects being or to be constructed in Guangdong-Hong Kong-Macau Greater Bay,design characteristics of underwater composite ground with deep cement mixing,as well as the corresponding superstructures,were surveyed and analyzed.On that basis,systematic analysis was carried out on the potential testing methods corresponding to drilling core,vibration sampling,wet grab sampling,cone penetration test,borehole radial loading test and plate loading test.Finally,combined with engineering practice,comprehensive comparison was made with the above test methods,and suitable testing methods to be adopted were recommended for underwater composite ground with permanent DCM clusters and trial DCM clusters.

Abstract:When Tianjinghao is dredging at sea,the wave parameters should satisfy certain conditions to ensure the safety of construction.In order to make sure whether the wave conditions sheltered by the breakwater meet the construction requirements of Tianjinghao,numerical model is used to calculate wave parameters in breakwater shelter with different progress node of a container terminal project,analyze adaptability of Tianjinghao,and calculate breakwater length need to extend to meet the construction requirements.The results show that the wave numerical simulation technology can provide a reliable basis for safe operation of dredger at sea and avoid risks.

Abstract:The Chinese pode is chosen as the armour layer in a deep-water breakwater of an abroad project,but there are few descriptions of Chinese pode in Chinese standards,some detail placement issues are encountered with international consulting engineering during the process of projects,such as the best slope ratio of Chinese pode,the detailed attitude requirements of concrete armour units,and the placing sequence for embankment body,embankment head and embankment top.Compared with the technology of similar concrete armour units developed by other countries,summarized the decades placing experience of Chinese pode from engineers of designation,model testing,and construction,several beneficial detailed placement rules are concluded in this article,which also provides some useful references for similar project.In general,predefined-point random installation is the most efficient placement way to achieve the best hydraulic performance.The predefined location drawing of Chinese pode,and the newly developed technology of underwater visitation system can greatly promote the placement quality.

Abstract:It is very difficult to control the construction of long row distance of the cutter suction dredger,which is a severe test to the operation of the excavating equipment and the conveying capacity of the equipment.In view of the characteristics of the long spacing of cutter suction dredger，the difficulties in the construction of long row spacing are analyzed,and the pipeline conveying conditions and actual conveying capacity are comprehensively considered.Taking the maximum mud mass that can be transported by pipeline as the measurement standard,compared with the actual mass transported,the ship control technology is adjusted based on the standard to optimize the construction technology of long row distance.

Abstract:The construction process of pile driving has a certain influence on surrounding buildings and environment.We make a theoretical analysis on the influence mechanism of pile driving and the simulation of pile driving process.Through a new plant project within the river land area in Shanghai,we apply hole expansion theory and the dynamic finite element method to calculate and analyze the pile construction on the adjacent riverway.The calculation results of dynamic finite element method show that the impact of pile construction on river bank is small,and is the same as hole expansion theory results.Engineering measures to prevent and mitigate the impact of piling driving are also put forward,which can provide reference for similar projects.

Abstract:A wharf project in East Africa is built with three berths.The high pile-beam structure is adopted.The center of the track beam at the front of the pier is 4 m from the foreline,and the overhang is large.The steel hoop and I-beam are used as the support system.During the process of concrete pouring,the settling data of the frontier line is larger than the theoretical value,and the maximum settlement of the frontline is 60 mm.In order to control the settlement,we piece the ribbed panel together with No.45 I-beam as the support system,and combine with the steel pipe pile top 25 mm rebar.The settlement of frontier line is reduced to less than 10 mm by this measure.The scheme is convenient and helpful to the project quality and construction period,which can provide the reference for the similar projects.

Abstract:To solve the problems such as large quantity of rock dumping and bad wave condition in the main breakwater extension construction of Hadarom Port at Ashdod,Israel,we carried out the 2D & 3D physical model tests,based on which,we determine the wave condition limit for different layers of rocks,optimize the construction schedule,design and implement the winter protection structure.We also carried out dynamic control of the construction schedule based on the 2D wave simulation prediction to ensure successful implementation of the project and meanwhile provide reference for the deep-water breakwater construction under similar wave condition.

Abstract:In the No.317 piled wharf engineering of Dadong port area in Dandong Port,to increase the penetration depth of the steel pipe pile in the pebble bed and satisfy the embedment requirement of the pile foundation,we adopt the open pile tip with outer hoop to reduce the side friction resistance of the pebble bed in the course of pile sinking to increase the penetration depth by more than 2 meters,and the side friction resistance gradually restores 30 days after the pile sinking construction,satisfying the requirement on the bearing capacity of the pile foundation.The results show that the increase of the pile tip with outer hoop can effectively reduce the lateral friction resistance of pebbles in the construction process,increase the pile’s penetration depth,and meet the requirement on the embedded length.

Abstract:Aiming at the differences in offset distance of sandbags,evenness of sandbag layer and construction efficiency of construction methods for dumping geotextile sandbags in the river,three construction methods,i.e.dumping by the manpower,flap and guiding cage respectively,applied to the river regulation engineering of Padma multi-purpose bridge project located in Bangladesh are compared.The result shows that the manpower dumping method is simple and the efficiency is high when dumping small sandbags,and the efficiency of dumping lager sandbags can be improved by using the flap,while the offset distance of sandbags dumped by the manpower and flap is relatively large;the guiding cage dumping method can control the falling track of the sandbag effectively and improve the accuracy and the evenness of dumped sandbag layer.By comparison,we get to know that the guiding cage method has advantages in the construction of geotextile sandbag dumping.