Abstract:The time intervals of the wave data by different wave observation methods are inconformity,and the accuracy of the data needs to be analyzed.Based on the annual wave observation data of hourly interval in Dacheng Bay,we obtain the wave data sets of different time intervals,apply statistical and correlation analysis methods to analyze the correlation of wave condition,wave height and wave period of large waves among different data sets.The results show that the wave condition of the data sets varies little,and the large wave height has a good correlation whose difference is 11.4%,while the large wave period has a poor correlation with 78.1% difference.Wave height data with a long time interval can be calculated by the correlation formula of this paper.It can provide more reliable wave height values for engineering applications in the situation of limited data.

Abstract:Ecological dredging has gained some consensus as an important mean of lake sediment pollution treatment.But there is no uniform standard for dredging depth design.Taking a project as an example,we analyze the polluted sediment and compare common methods including sedimentology,background value,inflection point and stratified release rate method,suggest a comprehensive coefficient K for the clearance degree of pollution transition layer to improve the dredging design method.This design method can be extended to the entire engineering area for the environmental dredging depth design.It will not only reduce the work of large-scale laboratory analysis and the cost of engineering research,but also is more convenient for application in the engineering design.

Abstract:For the calculation of wave force on the vertical structure with low pile cap,the design usually refers to the calculation method of wave force on the vertical wall building in the Code of Hydrology for Harbour and Waterways. However,because the front line of pile caps is not in the same line with the vertical wall below the pile caps,the wave forces of the two structures are different.Taking the Third Runway Extension Project of Shenzhen Airport as the research object,we study the wave force variation law of vertical dike with low pile cap under irregular wave action by physical model test.The results show that the impact pressure at the bottom of the cap reaches its peak value near Δh/Hs=0.2;the wave pressure at the front of the cap is less affected by the structure of the cap,and its variation law is similar to that of the vertical wall building;when the wave pressure of the vertical wall under the cap is -0.5＜ Δh/Hs=1.5,the impact pressure has obvious characteristics,which is several times that of the wave pressure of the ordinary vertical wall building.

Abstract:In order to provide theoretical guidance for the sensor placement in the high-pile wharf health monitoring system,this paper presents an optimal sensor placement method based on structural dynamic characteristics.On the basis of structural dynamics analysis of the transverse bent of representative structural units of piled wharf,the modal strain energy method is used to select the initial measuring points for the piled wharf transverse arrangement;the initial modal matrix is established,then the modal matrix is iterated and optimized by means of modal confidence method and sequence method,thus the sensors locations are obtained.The numerical simulation model of a single transverse bent is established,and the placement results of sensor points of seven pile foundations are obtained by using the optimal placement method of sensors,and the placement of measurement points is evaluated.The angle between the modal vectors tends to be orthogonal,and the sensor placement scheme is effective,which proves that the optimal sensor placement method is suitable for the sensor optimal placement of high pile wharf.

Abstract:To study the influential factors of the hydrodynamic characteristics of the catenary single pontoon breakwater,we carry out two-dimensional physical model experiment to study the variation of the transmission coefficient Kt of the floating breakwater model and the maximum tensile force F on the catenary chain,and discuss the influence of parameters including the draught S/d,the relative width B/L,the chain stiffness k,and the mooring inclination angle α on the hydrodynamic performance within 2D regular waves.The average wave height is used to calculate the transmission coefficient Kt and the average value of the previous 1/10 maximum pulling force is used as the maximum pulling force F.The results show that when the relative width B/L is less than 0.3,the relative width B/L is the main factor affecting the wave dissipation performance of the floating box model,and when the relative draft S/d is less than 0.14,the relative draft S/d is the main factor affecting the maximum tensile force F on the mooring chain.The results obtained can provide reference for the design and further research of the catenary single floating box breakwater.

Abstract:In order to study the evolution law of structural damage of all-vertical-piled wharf with steel pipe piles,we quantify the damage degree of wharf steel pipe pile by Ou Jinping seismic damage model,establish the calculation model of the wharf bent structure by ABAQUS finite element software to analyze the dynamic time-history response of the structure during seismic,and study the damage evolution law of the wharf piles with the seismic time-history and seismic intensity.The results show that the damage accumulation of pile mainly occurs in the period when seismic response changes dramatically and plastic damage occurs mainly at the top of each pile.Pile foundation enters plasticity repeatedly under strong seismic excitation,which leads to the gradual destruction of the structure.Damage value of pile is composed of displacement term and energy term.The former takes control action at the early stage while the latter contributes more at the later stage,and the proportion of displacement damage is higher than that of energy dissipation damage.Damage value of each pile presents an upward trend with the increase of seismic intensity.The damage distribution of pile foundation gradually increases from the sea side to the land side,and the land-side pile undertakes larger horizontal seismic force,which is also the main component of dissipating seismic energy.

Abstract:Structure of the jetty with fixed machinery and moving ship is composed by unloading platform,ship moving platform and fender pile in the front of the platform.Among them,the fender piles bear ship collision force during berthing and transmit it to the rear rubber fender and wharf platform.The structural stress form is complex,which is the key to wharf design.There is no corresponding calculation method in the existing codes and manuals.In view of this problem,the design features of fender piles are emphatically discussed.By simplifying the fender compression process into ideal elastic-plastic deformation and dividing the berthing process into three stages,the force state of fender piles is analyzed respectively.Based on the principle of energy conservation law,the equations of force,displacement and energy absorption of the fender pile system are established.A set of simplified calculation method is summarized and verified by practical projects.

Abstract:pre-stressing simple support box beam has stable structure,good section rigidity,excellent tensional strength,light weight and small material usage,but the application is fairly less in wharf engineering than railway and highway engineering.For the design problems of pre-stressing simple support box beam in wharf engineering,this paper combines the project example to analyze the selection of structural types,operational requirement,calculation of internal forces,sectional reinforcement and stress checking calculation.The results show that wharf track beam is used by post-tensioned pre-stressing single box double room simple support box beam,and it can satisfy the requirements of long span and high load,thus it can optimize the scheme selection,plane layout and structure selection of large deepwater berth.

Abstract:In view of the problem of the determination of the length of the full straight positioning pile and the bearing capacity of the foundation of the floating yacht wharf in Oujiang Port area,Wenzhou,under the geological condition of nearly 35 m muddy soil,the three-dimensional full-scale numerical simulation analysis and the verification of the bearing capacity of the foundation of the wharf structure with different positioning pile length are carried out by using the numerical simulation method under the action of wave force and flow force.The internal force distribution characteristics of shear force and moment,the maximum displacement of pile top and the maximum stress of pile body change with different pile length are obtained.The research shows that for similar projects,the control method based on bearing capacity of foundation and displacement of pile top as the main method,and pile shaft stress control as the auxiliary method can be used to determine piles length.

Abstract:As a new LNG floating terminal receiver,FSRU has become the global focus in the LNG field because of its own advantages.Based on NFPA standard,this paper designs the fire fighting of a LNG terminal project in a foreign country,and NORSOK standard and domestic fire code are used for reference for the unclear provisions of NFPA standard.This paper introduces the basic configuration requirements of fire fighting system of FSRU jetty, and analyzes the design parameters of jetty cooling water intensity,FSRU cooling water intensity,fire hydrant design flow,escape water mist protection intensity,shore flange supply requirements and fire duration,meanwhile selects reasonable values.The paper gives solutions to the key and difficult problems in engineering design,such as anti corrosion of seawater pipes and fire-fighting facilities,layout of pump house,etc.

Abstract:Based on the Moshui ship lock,this paper studied the hydraulic characteristics of the loop culvert filling and emptying system by physical model tests with a geometric scale of 120.In view of the uneven outflow of the upstream lock head,a new and efficient T-type baffle beam was proposed;and the measure for enlarging the inlet dimension of the emptying culvert was put forward to improve the bad phenomena of penetrating funnel-shaped vortex at the inlet of the downstream lock head.The test results show that the maximum lateral mooring force can be reduced by 50% in the case of optimized energy dissipators,and various hydraulic indexes meet the requirements of the code.This study provides a scientific basis for the design of the Moshui ship lock,and can provide reference for the design of other loop culvert filling and emptying system ship locks.

Abstract:Shuiniuhan ship lock is the upstream step of re-navigable project of Xiaoqing River.Due to the lack of water resource along the re-navigable project of Xiaoqing River,Shuiniuhan ship lock should need water-saving function.According to the topographical conditions of the lock site and considering the need for the future construction of the ship lock,we propose the overall layout of the Shuiniuhan ship lock with a single-level water-saving pool.In accordance with the requirements of Design Code for Filling and Emptying System of Ship and the characteristics of the re-navigable project of Xiaoqing River,we put forward the type of lock head filling and emptying system of Shuiniuhan ship lock to be short-culvert concentrated,connect the water-saving pool to the upper and lower lock head by a water conveyance corridor respectively,determine the detailed layout of the filling and empting system and the valve opening mode,and calculate hydraulic characteristics during lock filling and emptying with non-water-saving and water-saving operations by lock filling and emptying mathematical model.The results show that the detailed layout of the filling and empting system and the valve opening mode are reasonable,the hydraulic characteristics can satisfy the design and criteria demands.

Abstract:In this paper,focusing the filling and emptying system design for multi-lane locks under increasing demand of traffic capacity,and taking the four-lane locks of Changzhou Junction on Xijiang River as an example,the dimension variation of these locks under the demand development of traffic capacity has been summarized,the design considerations of the filling and emptying system for each lock has been introduced according to its characteristics,that the 2nd lane lock has small dimension,the 1st lane lock has wider chamber,and the 3rd and 4th lane locks are paralleling twin locks with huge dimension,the innovative results such as baffle sill energy dissipation device used in the 2nd lane lock,double open ditches energy dissipation device used in the 1st lane lock and interconnected water saving layout used in 3rd and 4th locks have been put forward. Some advices have been given for references such as overall layout for future multi-lane lock should put the large lock at the riverside and put the small lock at the bank side,and the filling and emptying system design should consider the geological condition,structure pattern and hydraulic indexes,etc.

Abstract:In the maintenance work of the Yangtze River estuary channel,in order to find out the reasons for the damage of the local renovation buildings in the upper section of the south dike,the paper carries out the a detailed field investigation and analyzes the topographic condition,hydrodynamic characteristics and hydrodynamic model of the damaged section,and gets to know main causes of the damage,i.e.,under the combined action of river regime conditions and hydrodynamic factors,the slope near the embankment turns steeper gradually,which leads to the damage. Based on this,the repair design scheme is compiled and the repair is completed with good results achieved.

Abstract:For the complicated navigable condition of Mujing ship lock expansion project,we carry out an experimental study on the navigable flow condition in the upstream and downstream approach channels of recommended schemes. On the basis of the hydraulic model test,we use the small-scale ship model measurement and control technology to observe and analyze the navigation parameters,such as rudder angle and speed.The results show that when Q≥3 900 m3/s,there are some parameters exceeding the limit both in the upstream and downstream approach channels,which may lead to a dangerous navigation;for both upper and lower waterways,the entering of the lock is more difficult than getting out of it and the navigation difficulties are on the turning section and the guard-wall end respectively,where the velocities of cross flow are relatively high.From the comprehensive analysis of the study results,a maximum navigable discharge of 3 000 m3/s is proposed,which provides a scientific and reliable data basis for the optimal design and later operation of the ship lock project.

Abstract:Lujiahe waterway is located in sandy-pebble section of middle of the Yangtze River,and it is seriously obstructed navigation for many years.At present,maintenance dredging technology is used as the main way to ensure the waterway unobstructed.Combining with the maintenance dredging technology of Taipingkou waterway in 2018,we analyze the characteristics of riverway and the causes of navigation obstruction,propose dredging idea,scheme and design parameter,and analyze the effect of dredging engineering by mathematical model.The results show that according to the complex navigation obstruction reasons of Taipingkou waterway,multiple factors should be taken into account in dredging ideas at present,such as upstream water level control with shallow water depth improvement,steep slope and rapid flow problem improvement with channel width improvement,dredging in advance to reduce maintenance pressure of low water level,layered operation with consideration of construction and navigation.Dredging areas include shallow pack at the front of Sanning Chemical Terminal and rubble piles on the right edge of Maojiahuawu.After the implementation of the project,the navigable depth in dry season can be guaranteed.Influence on water level upstream channel is little.Velocity near the dredging area can be reduced.It can provide a wider slow-flow area for ships

Abstract:There are still many single-line controlled river sections in the upper reaches of the Yangtze River,and the queuing phenomenon of ships in the area is serious.In order to explore the passing capacity of the control section,we combine the scheduling rules of the control segment signal table to introduce the queuing theory into the ship queuing research process,and establish an M/M/1 queuing service model with a priority.Taking the Wangjiatan control section as an example,we estimate the passing capacity of this section.The results show that the model calculates that the current average waiting time of the upstream section of the river section during the control and dispatching period is 32.5 minutes,and the downlink is 10.2 minutes.Based on the data of the ship and traffic flow,the passing capacity of the current control section is 191 million to 445 million tons,which is about 67.5% of the design passing capacity of the standard channel.This method can provide references for the similar projects.

Abstract:In view of the inconvenient handing of truss-type stop log gate in shiplock,we improve the design of a new lug structure for the gate to suit automatic grabbing beam based on the feature of truss structure. The lug is arranged on the upper plane truss,and connects to the nodes of the under plane truss by links,forming a space structure to make the force distribution more reasonable when the gate is hoisted. Then,3D modeling and mechanical analysis are carried out by INVENTOR,which verify the strength of the gate. Finally,the gate is used to an actual shiplock,which makes the handing of gate more convenient and saves much hoisting time.Thus it is quite economical and practical.

Abstract:The waterway of sea-crossing bridge area is a typical restricted area for ship navigation,and the collision safety risk of ship and bridge is high,so the research and development of intelligent navigation aid technology will help to improve the safety guarantee level of waterway in bridge area.Based on the analysis of navigation risk factors and hydrometeorological distribution law in the bridge area,the waters are divided into early warning,warning and waterway blocks according to navigation rules,and the dynamic domain risk identification model of ships sailing in bridge area is constructed.An intelligent navigation aid system for collision avoidance of bridge waterway ships is developed,which can automatically detect ship dynamics and broadcast anti-collision early warning information to the ship,as well as automatically manage and operate software and hardware facilities.The application of the system in Pingtan Strait Bridge waterway in Fujian Province has improved the safety situation of the bridge area waterway.

Abstract:The ship lock construction has huge workload,which involves many resources and interlaced and complex various processes.Therefore,it is difficult to make scientific and accurate construction plans from the overall point of view only on the basis of human brain experience.We study the simulation model and resource balanced optimization method of ship lock construction network plan under the constraints of limited total multi-resources,establish the simulation model of construction network planning for typical ship lock project and the “fixed construction period-optimization”mathematical model of lock construction network planning under multiple resource constraints based on the analysis of process designing and space division of typical ship lock construction,design the corresponding genetic algorithm to solve it,and verify by engineering application.The results show the model and algorithm are feasible and effective.It solves the resource balanced optimization proplem of ship lock construction network plan under the constraint of limited total multi-resource,which can provide the scientific and powerful basis for lock construction schedule,resources and cost management.

Abstract:Temperature monitoring and control during mass concrete construction is very important for crack control.In order to monitor the internal temperature of concrete more efficiently and conveniently,we develop a large-scale concrete intelligent temperature monitoring system,which automatically reads and analyzes the temperature of each point of the mass concrete structure through the server in real time,and promptly issues the prompt information of the temperature control technical measures that should be taken on site according to the preset temperature control index. At the same time,the internal temperature change of the concrete can be used to issue a command to the cooling water electromagnetic valve controller to realize the automatic change of the cooling water flow direction and start and stop. The practical results show that the application of this system can greatly improve the temperature control efficiency of concrete,and control the crack extent

Abstract:For the seismic design of revetment of the offshore artificial island in strong earthquake areas,when the method of quasi-static analysis and safety factor control is applied,the structure would be uneconomical,while the displacement analysis method can be used.The allowable displacement limit is sensitive to the engineering cost,so an appropriate allowable displacement limit is crucial for design;however,there are no clear provisions in the existing standards or manuals for reference. So,we compare the international standards or manuals such as ISO,PIANC,OCDI,FEMA,Alaska Geotechnical Commission and other related manuals on allowable displacement limit for the seismic design,and propose the displacement control limit suitable for Manila Waterfront City Reclamation Project based on actual design conditions of the project. Furthermore,we analyze the displacement sensitivity under different peak accelerations and different critical accelerations based on software SLIDE. The research results may serve as reference for the allowable displacement limit of similar offshore artificial islands in strong earthquake areas.

Abstract:In order to study the dynamic response of PHC pipe piles on the liquefied sandy soil foundation under earthquake,we apply FLAC3D finite difference software to establish soil,solid PHC pipe pile and equivalent mass at pile top as superstructure considering the coupling among the water body,the soil and the PHC pipe pile,and study the liquefaction of the soil,the deformation of the site and the response of the PHC pipe pile by the application of seismic loads at the bottom of the model for complete nonlinear dynamic analysis.The results show that the effective stress of saturated sand decreases due to seismic action,and liquefaction occurs in all height of sand.The occurrence and time of liquefaction are not only related to the buried depth of soil,but also to the sequence of seismic loads and the peak acceleration of seismic loads.The normal stress of pile embedded in soil increases first and then decreases,and the maximum value appears at the junction of slope protection and sandy soil.The lateral displacement of pile in shallow depth is larger than that in deep depth.The displacement and internal force of PHC pipe piles under strong earthquake are both large,and it is necessary to improve the liquefaction site before the construction of the wharf.

Abstract:In order to study the distribution of cone penetration resistance of dynamic compacted sand soil foundation,22 hydraulic reclamation areas were tested by static penetration test.The following distribution rules were found:1)Under the dynamic compaction sand soil foundation,the cone penetration resistance was basically linear within the depth range of 1 m. 2)For the area with a thickness of about 11 m,there would be a peak within the range of 1~6 m,and the cone penetration resistance would decrease within the range of 6~10 m,further the cone penetration resistance of gravel sand layer closing to the seabed elevation would increase again below 10 m. 3)For the area with a thickness of about 6 m,the cone penetration resistance of gravel sand layer closing to the seabed elevation would increase again;in the range of 1~4 m,the tip resistance would reach the peak value,and in the range of 4~6 m,the tip resistance would decrease,further in the depth of 6 m,the tip resistance of gravel sand layer closing to the seabed elevation would increase again.Through the test results,the bearing capacity and total settlement were calculated,and the rationality of construction parameters selection was verified.

Abstract:Two types of PHC piles with diameters of 800 mm and 1000 mm are used in a hydraulic project in Tanzania.We study the penetration performance of foundation pile with the different pile shoes,gather the total blow number and set from PHC pile construction,PHC pile shoe length and the connection method of PHC pile flange with pile shoe,and compare the set,pile body stress and energy of different pile tip forms to enter the same soil layer under the same geological conditions.The results show that the penetration performance of the cross protruding of pile tip is the strongest of different pile tip forms.The longer of pile shoe length is,the higher the penetration performance is,but when the length of the pile shoe is longer than 5 m,the penetration performance of the piles increases unobviously.The steel pile shoe and the PHC pile flange welded by slope plate can reduce the soil resistance during the pile driving,the set of the pile is larger and easier to penetrate to the design elevation.

Abstract:In order to improve the piling quality and construction efficiency of sand piles,we develop a set of sand pile construction automation monitoring system and apply it on site,including automatic monitoring system for sand pile route,pile current monitoring system and remote monitoring system.The measured results show that the travel monitoring system can accurately record the sinking,lifting and reverse insertion distance of the sand pile tube;the current monitoring system can reflect the change of the sinking current in real time. By comparing the tube route and current monitoring results,we know that the current monitoring can reflect the changes of the pile formation and reverse insertion effect,and the tube route and current data can be displayed and recorded in real time via remote monitoring. The development of the system can realize the fine management of the sand pile,liberate the on-site supervision manpower and improve construction efficiency.

Abstract:For the stability problem of surcharge loading on soft foundation for the causeway construction in the Yangtze River Estuary,we carry out a series of stress path tests under different loading patterns,and analyze the stress-strain relationship,structural damage characteristics,strength and strain rate development for the soft clay in the Yangtze River Estuary to provide technical references in the construction rate selecting and the stability control in the construction for this project.The results show that the undrained shear strength of the soil,without concerning the influence of consolidation,is almost independent on the loading pattern.The ultimate strength is independent of the strain at failure,and it shows strongly interacted with the loading time and the standing time.In addition,the strain rate at instability of soil is related to the loading rate and the standing time,and the loading rate is more predominant.The soil sample is nearly failure when the maximum stage-strain rate gradually deviates from the linear tendency or the surcharge loading reaches over 80% of the undrained shear strength.

Abstract:In the south breakwater project of Dongying Port Area of Dongying Port,in order to solve the problems of the traditional base protection technology,such as large amount of on-site binding and splicing works,high splicing quality requirements,complex technology,difficult construction,low efficiency and poor integrity,a new type full length and high strength geogrid composite soft mattress was developed.The integrated production technology that the bottom layer was full length geotextile,the middle layer of row was high strength geogrid,the middle layer of the remaining row on both sides was impact resistant and anti-aging cushion protection layer,and the surface layer was full length geogrid was developed,which solved the production problem of complex structure soft platoon.A traction device of power pulley group suitable for the construction of full-length and high strength soft mattress was developed,which solved the problems of heavy soft mattress,high friction resistance and difficult in sinking.The quality detection method of side-sweep sonar was adopted to improve the efficiency and quality of mattress construction.

Abstract:Bored pile technology is a common method of foundation reinforcement.How to effectively control the stability of bored piles after drilling is very important to ensure the integral quality of bored piles.Taking a project in coastal area as an example，aiming at the problems of low hole-forming efficiency and soil gushing at the bottom of the hole encountered in the construction of long spiral bored pile in water-rich sandy soil layer,the construction method of synchronous water-filling at the bottom of the hole after drilling is put forward and is verified by pile test.The result shows that water injection at the bottom of the hole can effectively solve the problem of soil gushing at the bottom of the hole after drilling.Using the bottom water injection technology of long screw bored pile can not only reduce the cost of construction,but also ensure the quality of construction and give full play to the characteristics of high construction efficiency of long screw drilling rig,therefore have good practicability.

Abstract:Aiming at the problem of large tidal range in the construction of seaports in some sea areas,we design to adopt precast structure at the lower layer of all the beams,change the concrete fender baffle to steel material,and cancel the shear key after specific test to shorten the time of waterwork.To deal with the anti-corrosion problem of steel piles around the spash zone,we use the composite piles. For the construction,according to the work period analysis and tide forecast,we propose that the barge shall berth at tide and the mooring cable,and be loosened and tightened from time to time. It is recommended to adopt the springboard barge and floating jetty,lift and install steel trestle by the tide,and deal with the difficulty of marine construction by adopting the jacking-up platform for piling and ripple method to reduce the adverse effects of large tidal range. The research result may serve as reference for the project construction under the condition of large tidal range.