Abstract:Hydraulic ship lift brakes use normally closed brake.In the normal docking process of the ship,and the condition of cabin leveling and accident,the brake has the effect of retaining the position of the box,preventing the balance side and the ship chamber side rope force transmission and protecting the synchronous axis.Due to the breaking of the load real-time balance system between balance weight and ship chamber after the ship lift hydraulic brakes,the corresponding loose conditions must be met before the release of brake,otherwise the safe operation condition of the ship lift is been damaged.Based on Jinghong hydraulic ship lift,the brake application condition and the judgment of loose condition are systematically analyzed.The judging basis of the brake condition and the release condition of the hydraulic lifter is obtained.

Abstract:The hydraulic ship lift controls the running characteristics of the ship lift by controlling the water flow.The flow control valve is an important control device for the hydraulic ship lift.Based on the hydraulic characteristics of Jinghong hydraulic ship lift,the anti-cavitation performance and the flow capacity of butterfly valve,ball valve and piston valve are compared in this paper,and the piston valve is selected as the flow control valve.According to the high docking accuracy and fast running speed of the hydraulic ship lift,this paper compares the various combinations of flow control valves,and creatively proposes the main valve and auxiliary valve co-control scheme.The co-control scheme is that a E-type piston valve as the main valve,two SZ-type piston valves as the auxiliary valves,the auxiliary valves control docking with small flow,and the main valve controls running with large flow.Jinghong hydraulic ship lift has been successfully put into operation,and the flow control valves running well.

Abstract:Hydraulic ship lift is a kind of navigation structure for ships to cross a high dam,the validity and rapidity of its electrical control system is very important.Taking the water driving system and ship-chamber system of the project of Jianhong ship lift as an example,we apply a set of program flow for the combined water filling and discharging valves and tumble gates of the ship chamber to meet the needs of auto filling or discharging water for the tank of the ship-chamber.This method has been successfully validated in Jinghong hydraulic ship lift.

Abstract:Considering large size gate,multiple functions,complex structures,limited space and other technical problems,we adopt the new structure of the vertical lifting small gate in large gate,the innovative design of the water seal structure,the compact layout of the hoist device and the drainage system etc.We apply new design ideas and relevant measures in the design process.Consequently,the layout of gate structure,hoist,water seal,water filling,drainage and internal equipment of the gate are perfectly resolved.So far,the gate has been successfully put into operation,which provides a reference for the future design and application of gates of the similar type.

Abstract:The hydraulic ship lift includes the hydraulic filling and emptying system,the mechanical system,the upper(lower)gates and hoists equipment,the electrical system,etc.This paper analyzes failures of all systems of the ship lift and relevant impacts of these failures on the operation of the ship lift,gives the classification and countermeasures of the accident conditions combining with the operation process of the ship lift,and probes into several typical accident conditions.

Abstract:Because large ship lift bearing capacity is large,its drum and shaft can hardly meet the requirements if using the conventional connection.We analyze various connections of the drum and shaft,thus develop a new connecting technology for Jinghong ship lift project to solve the technical problems of processing and assembly.Based on the theoretical calculation,the structural size has been determined,then the design and production of 16 large drum devices have been successfully completed.

Abstract:The traditional design method increases the intensity of the drum by increasing the wall thickness,which brings great difficulty to the manufacturing.According to the force characteristics of the ship left drum in practical operation,we put forward a new design method of drum wall thickness.We consider the rope groove as the ring to strengthen the ribs to make the drum wall thickness design more reasonable.The reliability of the drum intensity and deformation under this design method is verified by calculation and finite element analysis,which provides a reference for further improvement of the subsequent design method.

Abstract:This article introduces the characteristics of the hydraulic ship-lift,and discusses the key technology for hydraulic ship lift design.The hydraulic ship lift is safe and reliable,and can adapt to the large variation range of the downstream water level.This article focuses on the key technology of the filling and emptying system,mechanical system,and the status when the tank entering or leaving the water.It is pointed out that the filling and emptying system should focus on the synchronization of vertical shaft water level and the water flow control,the mechanical system should focus on the no-gap transmission and adaptation to the base deformation,and when the tank enters or leaves the water,the unbalanced loads need to be focused.

Abstract:Based on the HD module and the Ecolab module of MIKE3 numerical model considering water baroclinic,the numerical simulation of hydrodynamic environment in the Yangtze River Estuary and adjacent waters is carried out.The verified model is used to analyze the influence of the North Branch middling narrowing project on the hydrodynamic environment.The results show thatthe flow velocity of the North Branch is reduced to a certain extentafter the narrowing project,and the flood velocity nearthe branch pointhas a tendency to increasein the upper segment of the North Branch,which is affected by the tides in the South Branch.The North Branch middling narrowing makes the salinity of the North Branch decrease obviously,and plays a controlling role on saltwater intrusion from the North Branch into the South Branch.The content of phosphate,inorganic nitrogen and chlorophyll-a obviously increases in the lower segment of the North Branch after the implementation of the project.The average concentration of phosphate and inorganic nitrogen decreases slightly,while the content of chlorophyll-a increases in the middle and upper segment of the North Branch.The North Branch middling narrowing has little effect on the hydrodynamic characteristics and nutrient content in the South Branch and offshore area.

Abstract:Based on the investigation and analysis of the supplement of sediment resource in the Yangtze Estuary deepwater channel and the sand demand for the reclamation in Shanghai,we find out the supply and demand relationship of the dredged soil.The results show that:the deepwater channel dredged soil is a clean sediment resource that can be used for the tideland reclamation.In the 13th five-year period,the total production of the deepwater channel dredged soil will be around 315 million m3,which cannot fully meet the requirements of Shanghai of about 400 million m3.Different reclamation projects can utilize the dredged soil of different sections of the deepwater channel.

Abstract:An inverse model is proposed based on the extended finite element methods(XFEM)and a modified artificial bee colony(MABC)algorithm to detect and quantify the multiple internal flaws in structures.With this novel model,the location and the size of each flaw are approximated by the level set method.Moreover,a best-and-guided solution updating strategy is used during the global search until convergence is reached.The parameter samples with the different number of flaws are selected greedily by the artificial bee colony.The number of flaws,which is unkown in structures beforehand,is optimized during the iteration.This model avoids the problem of grid reclassification in the inversion process and reduces the amount of calculation for inverse analysis.The results of the numerical examples show that the proposed approach can detect and quantify the multiple internal flaws in structures and the corresponding locations and shapes without any knowledge of the number of flaws beforehand.

Abstract:The shoal of Maoweihai locates in the interactional area of the river outlet and tidal current,and the waterway development of it faces sophisticated flow and sediment problems.With current physical model,we simulate the whole tidal current,carry out a comparative analysis on the current pattern and current field variation of the waterway to be developed,and calculate the sediment in the waterway.The results show that it is very bad to maintain the waterway for the largest digging depth,the biggest increase of channel flow and the greatest siltation in Wajingjiang channel.It is unsafe to ship navigation for the biggest cross flow in Dalanjiang waterway plan B.In view of problems such as the influence from the tank water of ebb tidal,greater local velocity and sediment deposition,as well as the serious cross flow at the turning part of the waterway,channel development shall choose the deep groove with small cross-flow and may dredge properly.

Abstract:This paper studies the nearshore wave,current and sediment movement after building a groin by the numerical simulation,discusses the selection of the groin length and its angle based on the analysis of the changes of the nearshore sediment transport rate and the nearshore current,and obtains the along-groin rip current and near-groin sediment movement with different slopes of beach,different wave heights and different wave directions,with suggestions on the selection of the length and angle of the groin recommended.

Abstract:One type of special soil called diatomaceous was encountered during the execution of site investigation in Namibia.Its composition and microstructure was obtained by X-ray diffraction and thermal field emission scanning Its.Detailed laboratory analysis tests and various in-situ tests were carried out to gain the shear strength aiming at the special engineering properties of diatomaceous.The results show that the water content of diatomaceous is very high,the density is very low and the porosity is large.It is found that the shear strength of diatomaceous obtained by laboratory tests is consistent with that in-situ test.But compared with the shear strength,its compressibility is significantly higher appears not match with its shear strength.

Abstract:On the basis of the trend of automation development of domestic bulk cargo terminals and the demand of industrial structure adjustment,the collision between the arms of stacker and reclaimer is studied.In this paper,stacker-reclaimer anti-collision monitoring system has been designed effectively for warning collision and safe shutdown.This system locates the stacker and reclaimer based on double antenna’s GPS module positioning technology.The 2D oriented bounding box algorithm is also employed for machine arm space modeling and collision detection on account of the location data.The scheme solves the real-time problem of machine’s arms collision detection,and can be better applied to the yard operation.The system is beneficial to improve the operation efficiency and automation level of stacker reclaimer.

Abstract:Along with the recovery of global economy and the trend of container ships’ large-scale,Shanghai port,as the world’s busiest one,is facing a severe box congestion since April 2017.We analyze its reasons as well as demonstrate the technical solutions and vision planning for the problems faced by Shanghai port.The research results show that main reasons of Shanghai’s congestion port and limit future development include the shortage of throughput capacity of container berth,land resources for the port,ultra-deep waterways and ultra-deep container terminals,and the shortcomings of its future plan.This paper puts forward the point to explore Shanghai Hengsha’s unique advantages of location,shoreline and ultra-deep waterway to pave the way for solving difficulties faced by Shanghai port and plan ahead for Shanghai port.

Abstract:Taking the pile supported wharf as research object,we analyze the damage characteristics of the wharf by plastic hinge performance,and establish the models according to the two actual wharf structures.Through the pushover analysis of 24 kinds of working conditions,we apply the finite element software SAP2000 to study the damage characteristics of the wharf structure under different earthquake degrees,and establish the corresponding relationship between the damage degrees and the displacement ductile damage index.The results show that under different intensity earthquake,the main failure forms of wharf are mainly due to the plastic hinge of pile foundation and the lateral displacement of pile top,there are no plastic hinge appeared on the upper structure from the beginning to the final failure;under high intensity earthquake,the development degree of plastic hinge and displacement ductility damage index of the longitudinal direction of the wharf are larger than those of the transverse direction,which indicate that the longitudinal stiffness of the wharf is smaller and the damage is more likely to occur.The seismic damage of the wharf is divided into five degrees through the plastic hinge properties of the pile,which include basically intact,slight damage,medium damage,serious damage and collapse,and the corresponding displacement ductility damage indexes are 0～0.1,0.1～0.35,0.35～0.6,0.6～0.8,＞0.8.

Abstract:The design of port mooring system is related to the safety of ship docking and is one of the hotspots in the ship and ocean engineering research.In previous studies,less consideration was given to dynamic loads.In this paper,the design of port mooring system is studied on the basis of dynamic load.Firstly,the force situation of steel pipe,steel drum,heavy ball,welding anchor and anti-drag anchor is mainly analyzed,and then the system force situation model is established based on the force balance equation and the catenary model,using genetic algorithm for numerical simulation;finally,the inclination angle of steel pipe and steel drum,the chain shape,the draft depth and swimming area of the buoy are obtained by MATLAB programming,and the influence degree of each influencing factor on the mooring system is discussed.

Abstract:The reinforcement method of suspended breakwater is studied in different construction period and service life.During the construction period,the method of widening with the inside blasting is adopted to reinforce;and the outer sand is added with drainage plate to reinforce during the service period.The stability of suspended breakwater during construction and service period is checked,and it is proved that this method is feasible.Through monitoring the stability of the breakwater to meet the design requirements,it is concluded that the application of this method is successful.

Abstract:The application of long-span post-tensioned pre-stressed box track beam in port engineering has a trend of development,but the design requirements of port engineering are not specified in detail,and the research of this structure calculation is still less at present.Combining with the engineering example,according to the port and highway engineering codes and related literatures,we apply the finite element software to numerical simulate and analyze the mechanical property of long-span pre-stressed box track beam,meanwhile we consider the influence of the vertical nonlinear gradient effect on the internal force.This method can reflect the stress and displacement distribution of each part of the component comprehensively and accurately,and the verification result is reliable.

Abstract:Under the condition that the pile foundation has been completed,we apply the MIDAS finite element analysis method to analyze the static characteristics of dolphin pier of different heights,and further research on the main factors which influence the stability of structure displacement.It is concluded that the MIDAS finite element analysis of dolphin pier wharf structure performance is feasible,and build-in pile point to dolphin pier has a greater influence on the overall stability,while increasing its weight or changing its stiffness has a smaller effect on the stability of dolphin piers.Moreover,methods like rock rip-rap can be used in engineering to rise the engineering pile foundation point,which can increase the overall structural stability.

Abstract:Strict traffic control of LNG ships when entering and leaving the terminals has an impact on port operation.As a result,it is necessary to make a careful decision on the location and layout of the LNG terminals in the stage of planning.A systematic study is conducted based on a self-developed software of The simulation system of terminal operation based on multi-agent information interaction V1.0,the complicated port transport system with the effect of a LNG terminal is built.A real case is introduced to this study,and the research flow and method of effect by the navigation of LNG vessels in short and long terms are discussed.Combining with the characteristics of navigation environment,the optimization measures are put forward.The results could be employed to port planning.

Abstract:According to the status quo of and requirements for the navigational channel protection,the paper analyzes the contents of channel regulation and main factors affecting the stability of navigation channel.The paper also discusses the basic requirements and foundation work for the delimitation of the protective area of a navigational channel.Taking the first phase of 12.5 m navigational channel project in the Lower Yangtze River for example,the paper provides practicable recommendations as to the process of the delimitation of navigational channel protection area.

Abstract:The ship lock capacity is one of the most important factors to determine the size of ship lock.The sea ship lock in fishing port is almost under the complicated hydrologic condition,and it becomes extremely important to calculate the capacity reasonably.Based on the water depth for ships’safety navigation and the characteristics of hydrologic condition,we establish the actual tidal time calculating model under cumulative frequency of certain high tide level,and divide the capacity into flat tide period and tide period.Considering time that ship move in the lock,we revise the calculating method of traffic capacity in tide period,and introduce the concept of unit ships.The concept can simplify the selection and combination of ship types,and the determination the number of ships in one lockage is more convenient and accurate.The calculation of traffic capacity in flat tide period is based on the water depth and the tide waves under special organization model.The influences of organization form of ship lock operation and the service level also should be considered to make the result more reasonable.

Abstract:Main track is an important support part to guarantee the normal operation of plane valve in ship lock.This paper reviews the structures,advantages and disadvantages of common integral track,out-hung veneer track and embedded veneer track in recent decades,analyzes the wear characteristics of mild steel,cast steel,high quality carbon steel,alloy steel and laser cladding layer and other materials which are used as tread of main track,and puts forward improvement measures of optimizing structure of main track and directions of choosing materials of track tread.

Abstract:The planning lock capacity of ship lock is an important basis for determining the scale and standard of the lock construction.Because of the large deviation between the three key parameters such as ship type,ship water level difference and cargo flow in the lock design stage,there is a large deviation from the actual situation,which leads to a serious deviation from the forecast result and thus affects the accuracy of the scale and layout of the lock.Taking the actual operation data of a ship lock in Jiangsu Province for example,we analyze and compare the difference between the above-mentioned three parameters in the planning and actual operation stage using the capacity calculation method recommended by the lock design specification,and make a conformance checking of the berthing conditions.The results show that the lock design parameters have great influences on the analysis of the lock capacity,and the result of lock capacity calculated by combing the ship standard and water level is seriously conservative.In order to improve the accuracy of the planning for the lock capacity,further analysis and demonstration shall be carried out to the ship type and water level combination.

Abstract:In view of the evaluation question of the non-woven clogging index,this paper studies the permeation criterion and the gradient ratio criteria about the clogging index of the nonwoven geotextile commonly used in the slope filter layer of the channel regulation project,and finds out the relationship between the two points:the hydraulic gradient of the standard drainage gradient and gradient ratio limit.Based on this combination point,this paper carries out a series of non-woven clogging tests,and explores the evaluation model of non-woven clogging index to fit the evaluation formula of the non-woven clogging index in the anti-filtration layer of the bank slope and guide the calculation of the time period for non-woven fabric to function properly.The results fill the gaps in the field of research,lay the foundation for the study in this field,and have important value and significance for the future to promote the study of the field.

Abstract:Riprap protection of embankment is most widely applied in the middle and lower Yangtze River which can increase the flood control capacity of embankment and safeguard the flood safety of plains and major cities along the Yangtze River.However,rubbles crept down frequently that can lead to the damage of revetment.In order to comprehend the failure mechanism,flume experiments were carried out under different conditions such as different slope gradient,different particle size of rubbles,and different velocity.The damage of riprap revetment was researched from the characteristics of rubble force,flow characteristics,rubble displacement and rubble collapse.And then,the discriminant index of the degree of damage and the time node for maintenance was put forward.

Abstract:In view that the backflow rate exceeds the standard in the entrance area of the guide channel,we analyze the mechanisms of weakening the backflow in the entrance area of the guide channel by a variety of flow-guiding structures,and put forward the pile-rectifying technology,which is extended,covering a variety of flow-guiding structural types.Combined with the physical model test,we apply the pile-rectifying technology to the improvement of the flow condition in the entrance area of Datengxia hub’s downstream channel.The results show that the pile-rectification technology can effectively reduce the flow rate with LD of 1.0.

Abstract:The layout of energy dissipater and the effect of energy dissipation of lock chamber sidewall corridor ditches directly impact the mooring force and berthing safety of the ship in the lock chamber. Based on the hydraulic model test of the filling-emptying system of Hongyanzi ship lock,we discuss the application effect of the mesh-type energy dissipation and optimum design of adding the energy dissipation cover in the medium and high water head scattered ship lock.By comparing the hydraulic characteristics of ship lock during filling and discharging,the hydraulic pressure of the lock chamber,and mooring conditions of ships,we find that the optimal design of adding the energy dissipation cover has a better performance.An operation scheme of the valve opening mode is also put forward.

Abstract:To counter the problem of navigation-obstruction under Shaxikou hydropower station due to insufficient water depth on sill and channel in the dry season and the large velocity and disordered flow pattern in the channel,we follow the regulation idea of building dams and open channel combined with reef blasting to adjust the diversion ratio,raise the water level of the shiplock gate and channel during the dry season,adjust the flow state,and improve ship navigation conditions.Adopting the 1:50 physical model test to study the waterway regulation scheme,and according to the problems existed in the design scheme,we analyze multiple schemes.By the optimized scheme,the water depth on sill and channel,flow velocity and flow pattern satisfy the design requirements.

Abstract:Miter gate,as the plane gate which bears one-way head,has been widely used in navigation buildings.Pointing at the problem of vibration in the operation of miter gate,this paper studies the flow-induced vibration response to understand the miter gate excitation by the external causes.Water flow pulsating load is simulated to calculate the stress,displacement and acceleration response,and judge the harmfulness of vibration.

Abstract:The ship lock’s expansion and renovation in a narrow space is influenced by many factors,and the rationality of the general layout of lock position is particularly important.Taking an expansion and renovation engineering of ship lock for example,considering comprehensively the site selection,the width of shared approach channel,the effect on the second-line ship lock’s main structure and partition dikes in the process of construction,the layout of construction cofferdam,as well as the requirement of flood control,we carry out a research on the comparison and selection of the scheme.The lock layout scheme determined at last is that the distance between two locks’ axial lines is 80 m and the distance along river flow direction between the lower lock head of expansion and renovation the first-line ship lock and the lower lock head of the second-line ship lock is 4.4 m. Moreover,suggestions are presented for the follow-up engineering design.

Abstract:Based on the finite element model of high-pressure jet grouting piles composite foundation,when the arrangement forms of high pressure jet grouting pile with low intensity are equilateral triangle and equilateral quadrilateral,we study the influences of elastic modulus of pile,internal friction angle of soil,and length of pile on the bearing characteristics of composite foundation,and analyze the effective length of high-pressure jet grouting pile.The results show that the maximum vertical settlement value of soil with the arrangement form of equilateral quadrilateral is 93% of it with the arrangement form of equilateral triangle,the maximum vertical stress value of pile is 97% of it with the arrangement form of equilateral triangle arrangement,and the arrangement form of equilateral quadrilateral for high pressure jet grouting pile is better than the arrangement form of equilateral triangle for it.With the decrease of the elastic modulus of high pressure jet grouting pile,the maximum settlement value of soil increases,and the maximum vertical stress value of pile decreases.With the increase of the friction angle of soil,the maximum settlement of soil decreases,and the maximum vertical stress value of pile also decreases.The maximum vertical stress vertical of pile with the arrangement form of equilateral quadrilateral and equilateral triangle is basically unchanged when the length of pile is more than 10 m,so the effective length of high-pressure jet grouting piles with low intensity is about 10 m,and it is consistent with the results of the literature and the design values.

Abstract:To analyze the reclaimed soil influence on the working performance of cylinder infrastructure,we apply general finite element software ABAQUS to establish bucket foundation structure and reclaimed soil interaction of three dimensional elastic-plastic model,simulate the wave load and different thickness of reclaimed soil conditions affecting stress size and distribution,and obtain the soil pressure,the bottom of the vertical displacement and the change trend.The results can be used to check computations of stability for the bucket foundation of breakwaters.

Abstract:By modeling of ANSYS and explicit dynamical analysis of LS-DYNA,we simulate the concrete pier columns to lateral impact mass,apply four types of concrete constitutive model on the simulation,such as Johnson Holmquist concrete constitutive model,brittle damage constitutive model,continuous surface cap constitutive model,concrete damage model,etc,and test the accuracy of the simulation calculation by the system energy.The numerical simulation value is compared with the experiment results to further validate the accuracy of the simulation calculation.The concrete constitutive models are compared with prediction accuracy,prediction speed and parameter number.

Abstract:Pile foundation is the key to the whole structure of high-pile wharf.We establish pile-soil stress theory model,and analyze the pile,soil and their interactions in theory.Meanwhile,we apply the Fourier series convergence method to simply the symmetric inverse model for the computer to solve a given direction,use the language APDL on finite element analysis software ANSYS to build the pile-soil interaction model and load on it,conclude the regular on pile-soil overall deformation and side frictional resistance on pile with the depth,and compare the model results with the existing experimental results.The results show that Fourier series convergence method can change many elements into zero in the process of inversing stiffness matrix on symmetric model,in order to increase the computational efficiency of the computer.The overall displacement of pile and soil is small under different loads,and the friction resistance of pile and soil is piecewise linear,and the maximum stress reaches 32 m at the depth of embedment.In the project,more longitudinal bearing steel should be arranged.

Abstract:Taking a cross-sea bridge in Hainan Province as the engineering background,and with a method of the parallel contrast experiment,we apply static load tests to test the vertical compressive capacity of the three super-long bored piles,and record the friction of each part of the pile and pile tip resistance during the test.We also analyze the effects on the post-grouting on the piles capacity,the law of load transfer,and the characteristics of the resistance on the pile side and pile tip by comparing the test results.The results show that the post-grouting can improve the bearing capacity of the super-long bored piles and reduce the settlement.For the super-long bored piles,the effect of the pile-side grouting on the capacity is much greater than that of the pile tip grouting.After the grouting,the law of load transfer of the super-long pile is the same,the resistance of the upper side is activated before that of the lower side.The soil of the grouting section shows a cementing strength with the pile cement,while the shear strength is greater and the shear stress increases faster with the increase of the displacement.

Abstract:Timely detection of problems is critical to quality control.For conventional precast pile,the domestic related testing methods are relatively mature and integrity,and there are various testing standards or specifications.But for TSC pile pile,it is not clear for quality inspection standards and quality inspection means,it is also lack of related standards and specifications.To some extent,the popularization and application of TSC pile are hindered.In this paper,a suitable calculation method of TSC pile for water transportation industry has been put forward.Combined with numerical simulation and field test of high strain test,the feasibility of the single pile bearing capacity is demonstrated.The results show that it is feasible to detect pile body completeness and TSC single pile bearing capacity with high strain test,and the measuring sensor can be installed on the steel tube or concrete in high strain testing.

Abstract:Based on the foundation treatment practice of a large-scale engineering,we carry out a field test on the dynamic compaction of 6 000 and 10 000 kN?m energy-level respectively and test the treatment effect of the two energy-levels by multi-channel transient surface wave test and heavy dynamic penetration test before and after the dynamic compaction.The test result reveals that:the bearing capacity of foundation and engineering characteristics is improved after the dynamic compaction,and the bearing capacity of foundation and compression modulus of part depth cannot satisfy relative requirements after the dynamic compaction;the effective reinforcement depth of 6 000 and 10 000 kN?m are about 6.0 to 7.0 m and 7.0 to 8.0 m;due to the existence of mucky soil in the shallow layer,backfilling method of hollows,as well as the large spacing and small compaction energy of the 3rd time compaction point,the treatment effect of shallow layer is poor in 10 000 kN?m energy-level zone.Thus,measures shall be taken to improve the condition.

Abstract:Based on the piling practice of 12 mm thick steel pipe pile in a project in the Eastern Africa,we summarize the pile-driving regularity of the thin-wall steel pipe pile in the highly weathered rock area and the conclusions are as follows:when the steel pipe pile enters the highly weathered rock of 50 standard penetration blow count,the penetration is within 21.5～28.3 mmblow and the maximum energy transfer coefficient reaches 94.5% of the hydraulic pile driving hammer while the pile tip is in the highly weathered rock.The penetration depth of pile tip can reach 7.1 m in the highly weathered rock,and the penetration is 1.5 mmblow correspondingly.When the pile tip of the thin-wall steel pipe pile enters 3.7 m below the highly weathered rock layer,the end resistance increases slowly,and the resistance value of the pile increases by 30.8%～32.8% according to the result of pile D1 and E1.

Abstract:Reclamation project needs to take sand to the shore from long distance.Joint construction with the hopper dredger dredging and hopper barge can improve the efficiency of the project from the far distance,also can supplement the construction capacity and reduce the overall cost.We establish an effective calculation method by the process feature and factor analysis method.With the actual construction data,we calculate different forms of comprehensive efficiency from the different transport distance.We obtain the combined efficiency of the typical working conditions and applied boundary conditions,which can provide the data for support and decision.

Abstract:The soil of Suizhong port district general wharf project in Huludao is gravel with pebble and sand,which is characterized by large particle size,large density and large friction resistance.When dredging this kind of soil with cutter suction dredger(CSD),the construction parameters are unstable,the soil is difficult to be transported and production capacity is low. So,methods including construction data analysis,comparative optimization of different dredging layers based on the layered tri-dredging,optimization of the conveying technology,as well as installation of the flow deflector are taken to optimize the construction technology.As a result,the the construction productivity of Suizhong port district general wharf project is increased by 30%,the construction cost is reduced and the construction period is shortened.

Abstract:Based on the constructing project of Hadarom Port at Ashdod,Israel,aiming at the problems of construction of Quay 27,such as the storm in winter bringing more risk to the uncompleted structure of sheet piles and the limited equipment and insufficient work efficiency not able to complete the structure of Lee breakwater as a shield for Quay 27,we propose the thought of an embankment constituted of reclamation material to be regarded as the shield for Quay 27 before Lee breakwater is completed.More in this way,the anchor piles could be driven by crane on land,and the problems in project are solved.The technology has the advantages of good construction continuity and strong feasibility under strong wave conditions.This systematic construction plan could be used as a reference for the projects constructing sheet piles in similar condition.

Abstract:The temporary wave elimination measures for construction area were developed to deal with technical problems in the settlement of steel cylinder structure.Four types of floating breakwater with different principles were proposed to attenuate wave:floating barge with rigid wall,floating barge with flexible wall,water bag raft and V-shaped water bag group.A series of experiments were carried out to compare the wave transmission coefficient of the floating breakwaters.The influence of wave period and angle on wave attenuation performance was analyzed .The results showed that V-shaped water bag group with angle of 60° had a better attenuation performance than the other floating breakwaters.