Abstract:In order to solve the problems of large displacement and poor precision of the stone in the deep water and large flow rate,the research and development of the riprap ship for block stone dumped in deepwater and large flow rate are carried out.The application of the grille U-shaped chute and the frame walk trolley ensure that the block stone in the large flow conditions are not scattered and the stone waste is reduced. The results of the filling surface inspection show that the rate of stone throwing is more than 90%.The high precision fixed throw filling is achieved.

Abstract:Aiming at the complicated problem of laying the soft mattress,the theoretical analysis is carried out,and a simple and effective calculation method of the soft mattress force is obtained.Based on the Characteristic of the Yizheng waterway regulation project of 12.5 m deepwater channel from Nanjing in the Yangtze River，the performance of ship equipment and the quality control technology of the ultra-long soft mattress under complex flow condition are improved,and the working efficiency of the software and the precision such as underwater positioning of the drainage and the overlap width are improved.

Abstract:The hydraulic driving system is the core of the hydraulic ship lift,and its design determines the lifting efficiency and operation safety of the ship lift directly.Based on Jinghong hydraulic ship lift project,reasonable layout and structure design of hydraulic driving system and variable speed opening mode are proposed through unsteady flow numerical analysis of the process of filling and emptying.The hydraulic pipeline design is optimized through physical model test.The length of straight section is extended and the connected corridor is added to raise the synchronism of water levels of vertical wells.Furthermore,considering many other factors,the detail design of hydraulic driving system of Jinghong ship lift including the inlet and outlet,water delivery pipeline,vertical well,etc.is put forward,which may serve as reference for the hydraulic driving system design of the same-kind ship lift.

Abstract:There are multiple fluid-solid couplings in downstream docking process of hydraulic ship lift,such as the ship and the cabin,the cabin of the water and the ship,the shaft of water and the balance of weight.Therefore docking process ship crane force is more complicated than the traditional wire winding type ship lift.In order to ensure the safe and efficient docking operation of the hydraulic driven ship lift,we study the working condition and the downstream docking position of the hydraulic driven ship lift.By means of Jinghong hydraulic ship lift prototyping downstream docking process test,we discuss the influence of downstream brake operation and the docking position,deduce the formula of the displacement of the ship lift when the brake is not on,and obtain the applicable conditions of the brake working mode and the docking position.

Abstract:The coupling between water and buoys in ship lift system under earthquake loading is a difficult problem affecting ship lift safety operation.Using fluid dynamics simulation (CFD) method,we discuss the water oscillation in the shaft of ship lift at different frequencies of sine excitation.The result shows that there exists a natural frequency of water in the shaft,which is greater 10% than the one of the rectangular pool with the same size and the same water depth,the natural vibration period is about 0.42s.The natural frequency of shaft water basically does not change with height.

Abstract:The branch pipes are the important part of the hydraulic ship lift water conveyance system.Aiming at the force characteristics of the branch pipe in the hydraulic ship lift of Jinghong hydropower station,we apply the numerical calculation method for sensitivity analysis of four-girder reinforced trifurcations and four crossed pipe.The results show that the structure of the branch pipe is reasonable and feasible to meet the requirements of the water conveyance system layout of the hydraulic ship lift.The research can provide a scientific basis for the design of the bifurcated pipes of the hydraulic ship lift.

Abstract:The mooring condition of ship during falling door opening and closing is one of the key problems in ship lift hydraulics.This paper,combining with RNG k-ε turbulent model,VOF free surface capturing method and GMO which simulates objects movement,simulates the mooring conditions of ship during falling door opening and closing,and analyzes flow filed and mooring force by numeral calculation.The numeral calculation results are in good agreement with modeling experiment’s.

Abstract:The hydraulic ship lift is a new-type one with Chinese proprietary intellectual property rights without relative standards and rules about operation and maintenance for referrece.Based on the long-time project practice,debugging and trial navigation of Jinghong hydraulic ship lift,this paper expounds various operation ways and procedures including centralized control and terrain,automatic and single step,etc.systematically.Key checking items and safety control indices in the operation of the ship lift are summarized and key points for the device maintenance are also proposed to provide reference for the operation and maintenance of the hydraulic ship lift.

Abstract:Based on the design of Jinghong ship-lift,this article expounds the functions of all subsystems of mechanical system & components of hydraulic ship-lift,reseasrches the structure & design parameters of the ship-lift,and proposes the main structure & design parameters of the drum,the synchronizing system,the float,the fall block device,the wire rope assembly and the water-entering navigation chamber.Probing into details in adding water of the float,this paper puts forward the novel-innovative structure for the gapless synchronizing system and the sealing device which is used for the navigation chamber docking,providing reference for the similar engineering design.

Abstract:The tower is the main building of ship lift.Aiming at the force characteristics of the hydraulic ship lift of Jinghong hydropower station,we apply numerical calculation and model experiment for deeply studying the tower structure of hydraulic ship lift.The results show that the numerical results are in good agreement with the model test results.We use the relevant monitoring results after construction to prove the design,and the results can provide reference for the tower design of similar hydraulic ship lift.

Abstract:Due to the installation features and difficulties of wire rope assemblies used in large vertical ship lifts and the shortcomings of the traditional installation,a new kind of scientific installation technique and operation method for wire rope assemblies are proposed.The measures of precise positioning of the wire rope combined with rope winding device are taken to solve the problems of installation of wire rope assemblies including a large number of wire rope components,large wire rope diameter,narrow construction site,multi-rope groove winding for long ropes and short ropes,etc.This technique has been employed in the construction of Jinghong and Three Gorges ship lifts and achieved remarkable effects.

Abstract:The data of environment,hydrologic condition,durability design and load design are surveyed and collected.The durability monitoring sensors are embedded in the construction period to monitor the durability degradation from the beginning of the construction period to obtain key durability parameters of the project.The exposure test stations are built to carry out the exposure test investigation with the same raw materials and mix proportion to the project.While at the same time,the durability of the concrete also with the same raw materials and mix proportion to the project is carried on in laboratory.Therefore,the differences of the durability degradation among the projects,exposure tests and laboratory studies could be investigated and the relativity would be built.It could guide the design and construction of marine concrete structures.

Abstract:Lingdingyang Firth of the Pearl River Estuary is a sensitive sea area with unique geomorphic features and complex hydrodynamic sediment conditions,and it is also one of the coastal sea waters with densest routes and biggest ship density.The Hong Kong-Zhuhai-Macao Bridge (HZMB),consisting of bridge-islands-tunnel,is a super large complex project crossing the Lingdingyang Firth.Aiming at HZMB and complex hydrodynamic sediment environments of Lingdingyang Firth,various means are adopted to carry out comprehensive and deeply studies on the key problems such as the influences of HZMB on hydrodynamic sediment environment,harbor and navigational channel and stability of shoals and troughs,etc.The following main conclusions are drawn from the study.1)Lingdingyang Firth of the Pearl River Estuary presents the characters of micro-variability,tendency-to-stability and flexibility,and its geomorphic pattern of “Three Shoals and Two Troughs” can keep stable chronically.2)The recommended scheme of HZMB has relatively less influence on hydrodynamic sediment environment,and it has bascially little unfavorable impact on harbors and navigational channels.3)The recommended scheme of HZMB is feasible as far as its effect on hydrodynamic sediment environment is concerned.

Abstract:The Yangshan sea area is characterized by strong tide,rapid flow and high sediment concentration,and there are complex tidal currents in channels between islands.After completion of the phase I project in the North Yangshan chain,a large-scale recirculation zone was formed during the flood tide period in the wharf water. So,we carried out the tidal current physical model test and obtained a recommended scheme for the phase I project,which solved the problem of recirculation in wharf water during the flood tide period.Furthermore，combining with the scheme selection test of Yangshan deepwater harbor phase I project,we analyze the characteristics of typical tide currents and corresponding sediment movement near islands，and point out matters of attention in planning marine engineerings in these waters.

Abstract:BIM has brought the revolution to the traditional construction industry.While the application of BIM in waterway infrastructure is currently left behind when compared to building domain,to solve this problem,this paper analyses the state of the art of the global BIM application,technical policy and technical standard,and the comparative analysis is conducted.On this basis,recommendations including standard research and development,key technologies,sustainable development,policy making,selection of exemplar projects and roadmap development are proposed to facilitate the comprehensive industry BIM implementation in China.

Abstract:The maximum wave rising height is one important factor in the calculation of top level in the design of open high-pile wharf.Aiming at the selection of calculation theory for the wave rising height,we expound the theory of second-order Stokes wave and cnoidal wave.Combining with one project in West Africa,we use different theories to calculate the wave parameter of every control point.The results show that the relative water depth should be calculated before the calculation of wave rising height in the long period wave area.When d is smaller than 0.125L,the result based on the second-order Stoles wave theory has large error,but the result based on the cnoidal wave theory is more in line with the actual situation.

Abstract:Aiming at the problem of dock repair of semi-submersible ship and other heavy-duty products while strength of dock floor is insufficient,we analyze numerical simulation of the interaction between dock floor and steel case board under dock load by using finite element method,and study the influence of the spread of the load along the steel case board on the internal force and settlement of the dock floor.Contact problems between two different materials of concrete and structural steel can be well solved by the application of contact elements by the finite element method.The results show that there is no excessive intrusion,disengagement or slip between the steel case and the base plate.By setting the steel case board at the local position of the dock floor where large load is applied,the vertical load spreads along the four sides of the steel case board to extend the application range of the dock floor,which can effectively reduce the internal force and settlement of the dock floor.The method can effectively solve the problem of insufficient strength of dock floor.

Abstract:The clay and sea sand in coastal areas are abundant and appropriate ratio of clay mixed with subsea sand can be used for constructing seawall theoretically.Adopting the DDS-70 cyclic tri-axial test system and GZZ-50 resonant column test system,we carry out the experimental study on the dynamic behavior of the subsea sand-clay mixture with different blending ratios and obtain the dynamic strength and maximum dynamic shear modulus it.Moreover,the influence of the blending ratio and confining pressure on the dynamic strength and maximum dynamic shear modulus are analyzed.The results show that the dynamic strength and maximum dynamic shear modulus increase with the enhancement of the confining pressure;with the decrease of proportion of sand and the increase of proportion of clay,the dynamic strength and maximum dynamic shear modulus decrease.

Abstract:According to characteristics of easy pasting tool clay in Tianjin port,this paper points out that the key indicators for adhesive forces of easy pasting tool clay are its moisture content,plasticity index and cohesion.Based on a lot of indoor soil geotechnical test data about easy pasting tool clay,this paper studies and analyzes the relationship between adhesion and key indicators including moisture content,plasticity index and cohesion by the mathematical statistic method.The results show that:1)the regression coefficients of empirical formula of adhesive, moisture content and plasticity index are above 0.8,which means high reliability;2)adhesive force of clay is about 3 times of its plasticity index under natural condition in Tianjin port.Aiming at the case of cohesive soil dredging construction and through the comparison of the adhesion and its key indicators,the paper conclude that it is possible for cohesive soil to paste tool under this condition.

Abstract:Relying on the Algeria Ore Terminal Project,we propose a double-row-cylinder structure,and analyze numerically its static response under the action of the wave crest with Abaqus.There are two schemes to connect the two rows of the cassions,which are using simply supported slab and rigidly coupled slab.The latter form is better in deformation coordination with a smaller maximum base stress,and it’s easy to meet the requirement of the slab strength.However,it needs a higher cost.As for the scheme of using simply supported slab,the slab gaps can be with or without filling the flexible material.In the former situation,the soil pressure takes on a linear distribution with the bigger value in the upper place,which is opposite to the latter situation.The load transmitted by the connecting slab will account for a considerable proportion,and base stress is greater in the latter situation.

Abstract:In combination with the design of a container wharf project in Wenzhou Port,and in view of the complicated natural circumstance & environmental condition,poor construction condition,as well as high requirements,we study the application of super long combination large- diameter cylinder pile in the deep soft soil area.Analyzing the advantages of super-long combination pile,and carrying out the static-load test for the super long combination large-diameter cylinder pile,we demonstrate the applicability of the pile foundation in the offshore area with ultra thick soft soil covering,determine the friction coefficient and tip resistance of the pile,optimize the arrangement and length of the pile,and thus greatly reduce the project investment.

Abstract:Because of the large transverse currents in the wharf apron area,the ships can easily bang into the wharf or the mooring ropes break.Therefore,studying the flow fields in the wharf apron area is important for the reasonable selection of the wharf axis as well as the successful berthing.On the basis of pile group resistance,the flow field around the high-piled wharf in Caofeidian first phase and third phase ore terminal projects are simulated with the triangular net hydrodynamic modules(FM modules)in Mike21 software.Compared with the measured velocity and flow direction,the influence parameters of pile group in the model are determined.Moreover,the effect of the construction of pile wharf on the surrounding sea area is researched by the method,also the method can calculate and analyse the transverse currents in the wharf apron area.It has been proved to be an easy and high-effective method and the effect of the construction of high-piled structure on the large sea area is reasonable.It is helpful to the reasonable selection of the wharf axis as well as the successful berthing.

Abstract:Determination of the slope stability have been carried out aiming at the problem of slope instability caused by excess large pore water pressure or the small vertical effective stress.The curve of vertical effective stress and excess pore water pressure of body or a slope foot point over time is analyzed,compared with traditional arc sliding method.It is concluded that the slope stability can be determined by the vertical effective stress or the excess pore water pressure in the design and construction process,which also can be used to monitor the development of slope stability.

Abstract:The wharf construction has many problems in Latin America and Africa,such as lack of large-scale ship equipment and poor offshore construction conditions(long-period wave).Meanwhile,the operation of conventional piling and the installing of prefabricated components are both difficult.Based on the general structure of pile wharf,we optimize design and construction of the structure,adopt a self-traveling platform by cantilever construction method,use the pile foundation as supporting structure,and also adopt composite beams and slabs.The method transforms the construction into activities on land as an innovation,establishes a new structure as wharf with pile foundation under cantilever construction method,avoids lack of large-scale ship equipment and poor offshore construction conditions(long-period wave).The method shows its well economical efficiency and applicability in meizoseismal area.

Abstract:Due to the special sea area in the marine climate environment,the sea harbor wharf faces sea water,sea fog and other corrosions,which lead to damages of the main wharf structure.Taking a sea harbor wharf in Zhejiang province as a study case,we probe into the structural repair and reinforcement technology for the wharf to provide a scientific basis for the application of the sea harbor wharf in use,repair and reinforcement of the corroded concrete members,as well as the reconstruction and extension of the sea harbor wharf.

Abstract:In view of the problem that the small craft harbor structure is rather flexible and its berthing load can not be calculated by the method used for the normal high-piled wharf,we provide a new method for the small craft harbor’s berthing load condition combining the theories of structural mechanics and energy conservation law and adopting the infinite element method,which considers that the structure and the fender absorb the berthing energy together.The results show that this method is reasonable.

Abstract:Significant variation of flow condition of Yibin to Luzhou reach is affected by unsteady flow caused by hydropower stations in the Jinsha River and the mainstream and tributary of Minjiang River.Based on one-dimensional unsteady flow mathematical model and analysis of measured data,study on the propagation process of unsteady flow from Yibin to Luzhou and the change of hydraulic parameters relative to steady flow condition is achieved.The results show that the wavelength of representative unsteady flow is about 218 km,propagation velocity is about 3 m/s;as the propagation distance increases,the attenuation amplitude decreases and the waveform becomes smoother;downstream flow decrease along the river when the water level of Yibin is at the crest,the trough is just opposite;relative to constant flow condition,the flow change in the range of 0 m3/s to 730 m3/s and the water level rises from 0.5 m to 2 m,the average velocity of cross section varies from -0.5 m/s to 0.2 m/s,the variation of water surface slope is from -0.2‰ to 0.2‰ and the maximum gradient is 1.38‰.

Abstract:The finite element software ABAQUS is used to construct the whole finite element model of the high-lift ship lift system,which is composed of the base,tower column,ship chamber and water,lifting cables,pulleys,counters,vertical and horizontal guides.Dynamic characteristics analysis of the high-lift ship lift system is carried out using numerical simulation method.The effect of foundation stiffness and the chamber vertical position on the dynamic characteristics of the ship lift are investigated.The results show that the vibration modes are more intensive and the few initial modal frequencies are zero without considering the foundation,which may lead to the dynamic instability of operating system.In the ship lift system,the overturning and lifting modes will adversely affect the strength of the security agencies and the stability of the ship lift system.The corresponding frequency value of the main mode of the ship lift structure is decreasing when the vertical position of the ship lift chamber is changed from low to high.

Abstract:Honghua 2nd lane lock is one of the first-round key construction projects for Xijiang Golden Waterway,and it is also an important project to improve the navigation capacity of Liujiang River and Xijiang River and to achieve the goal of one-hundred-million-ton Golden Waterway.The lock chamber size is in line with the Three Gorges Lock.The working water head is nearly 20 m,and flow energy is huge.Considering the characteristics of this lock,the in-chamber longitudinal culvert filling and emptying system is chosen,and the detailed layout is put forward including a confluent culvert for improving the flow condition under single valve operation.The hydrodynamic characteristics,ship berthing condition in lock chamber,and flow conditions around inlet and outlet are all studied by a 1:30 scaled physical model.Based on the model test,recommended valve opening patterns are put forward under which all the parameters can satisfy the needs of codes and design.

Abstract:Taking the main channel project of Lianyungang Port as an example,this paper analyzes the long-term matching of the integrated channel and the planning of the shoreline resources of the port,and the adaptability of the channel and the navigation standard.Based on ANYLOGIC multi-agent simulation modeling platform,using the object-oriented modeling method,a simulation model of the port operation system of the main channel of Lianyungang Port is established.The model covers the whole process of the ship’s entering and leaving port,anchorage,channel and wharf production.Based on analyses on the long-term channel transit capacity,channel service level and the rationality of the channel width,the long-term navigation standard is proposed.

Abstract:The unsteady flows adjustment process of the Jinsha River and the Minjiang River are more complicated,and a new unsteady flow to the downstream propagation in Yibin section is formed after the confluence.According to the recent data,the paper analyzed unsteady flow characteristics and convergence effect of the Jinsha River and the Minjiang River.The results show that the unsteady flow characteristics of Yibin section is accordance with the unsteady flow characteristics of Xiangjiaba Hydropower Station;the unsteady flow in the Minjiang River has no typical process;there is a linear relationship of water level amplitude between Yibin section and the Jinsha River and the Minjiang River.Typical process of unsteady flow in Yibin section is a discharge wave which has about 1.7 m rising water level and about 1 m initial water level.Its propagation velocity in the downstream is basically consistent,and the attenuation amplitude decreases with the increase of distance.

Abstract:This paper puts forward a new grass mat structure after analysis of the insufficient of tradition erosion control structure of beach protection engineering edge.The paper carries out fixed bed and moving bed model tests to study the effects of different flattening degree,different layout and different current velocity on scour prevention.The results show that when current velocity is small,blade bending amplitude is small.Current velocity increases to 0.3 m/s,and blade bending amplitude is large.While current velocity increases to 0.73 m/s,blade bending amplitude increases lessly.When blade flattening degree is 60°,scour prevention effect of sparse arrangement mode is better.When it is 75°,scour prevention effect of close arrangement mode is better.However,when the current velocity is large,the erosion protection effect of grass mat will be less.Based on the researches,the paper determines the grass mat structure.

Abstract:In recent years,with the improvement of the waterway grade,the scale of the design navigation ship has been increased,and the requirements of the navigation clearance scale have increased,and the conditions of navigable waters in bridge area have changed significantly.The bridge exists ship collision risk,it is necessarry to implement the assessment of bridge and ship collision venture,which provides a reference for the anti-collision facilities engineering to protect the bridge.At home and abroad,accidents that cause bridge collapse or serious damage are gradually increasing,and an average of one large bridge is damaged or even collapsed every year. The waterway grade of Beijiang River channel Wushi to Sanshui estuary segment is promoted from grade IV to grade III after the channel regulation,the bridge exists the ship collision risk.Based on AASHTO probabilistic model of ship and bridge collision,the influences of the parameters on the ship bridge collision are probability analyzed,the annual collision probability of the ship collision with each wading bridge pier is calculated,the annual frequency of the collapse of the bridge pier is obtained.

Abstract:The flow condition at the entrance area of the lock approach channel is directly related to the safety of the ship in and out of the lock.For the problems of disadvantageous flow condition,insufficient water depth and big transverse velocity at the entrance area of the lower shiplock approach channel in Shaxikou hydropower station,the whole physical model of upper and lower reaches near the hydroelectric station are established.Combining with the ship model navigation test,we study the navigable flow condition at the entrance area of the lower shiplock approach channel and propose the optimum scheme.The test results of the second optimum scheme shows that,by building a dam and excavating new open channel and permeable partition dikes at the bottom,the navigable flow condition at the entrance area of the lower approach channel is improved significantly and meets basically the specification requirements of the navigation flow condition.The ship model navigation test shows that the ship can pass through the entrance area safely,and the ship maneuvering parameters are controlled within limits of requirements.

Abstract:Based on the analysis of the causes of the landslide problem in the upper reaches of the left bank slope of Naji navigation junction project,it is concluded that we shall pay attention to the stability of slope soil,the sudden drop of the groundwater level,as well as the erosion and adsorption of the bank slope.Two treatment schemes,i.e.slowing down the bank slope scheme and cement mixing pile reinforcement scheme,are put forward for the bank slope landslide.Comparing them in safety,construction,project investment and project effect,we recommend the slowing down bank slope schemed.

Abstract:We put forward an approach for modeling the transient response of solid pile with large diameter,and the generalized defects are divided into three types including mutation defect,gradient defect and combined defect.Based on the Rayleigh-Love theory,plain strain model and fictitious soil model,we form the mathematic frame,adopt the integral transformation methods to solve the equations,and program effective the calculation process.On this basis,the differences in the simulated results of the three types of defects are compared,and the differences in the reflected wave characteristics between the peripheral contamination at the base and the bottom sediment are discussed.The present method is proved to be rational and will be conducive to the analysis and judgment of reflected wave curve with complicated defects.

Abstract:Because of the high limit and crack moment value,large pipe piles are widely used in foundation engineering.In offshore engineering,the fatigue performance of large pipe piles must be considered because of the horizontal dynamic load of the pile foundation subjected to long-term wave,current or ship impact.The anti-cracking performance of D1200B32-2 pipe piles is studied by the bending test under cyclic load.The fatigue damage of the test samples is obtained and the fatigue limit bending moment is predicted by lgS-lgN curve.It provides some reference for the design of fatigue strength of large pipe piles.

Abstract:A 52.5 m-length and 1.0 m-diameter steel tube pile is driven into soft soil foundation.According to the pile pressing experiment,pile pulling experiment and pile horizontal static load experiment,we discuss the engineering properties and distribution law of steel tube pile in soft soil foundation.The results show that the maximum bending moment of the horizontal static load experiment of the steel tube pile in the soft soil foundation is at 2 times the pile diameter below the mud surface,and does not change with the increase of the load.According to the horizontal static load experiment result,the m value should be 3 500 kN/m4 considering the displacement of mud level to be 10 mm.The side resistance of soft soil foundation is small,so the ratio of the axial force to the pile top is 30% in the pressing pile experiment,and it is about 12% in the pulling pile experiment.

Abstract:For the Yangtze River Estuary area in recent years,some new reclamation projects cannot excavate the storage pit because of constraints or cost control.Through Changxing submerged breakwater engineering construction,we introduce the construction technology for integration of deep-water channel dredging and filling in the Yangtze River Estuary,and discuss the key technologies of dredging,anchoring and bowing.The construction technology does not need to set the storage pit,and the dredging soil could be pumped to the shore for land reclamation.It is very effective,resulting in a comprehensive benefit in the Yangtze River Estuary area.

Abstract:For the Yangtze River Estuary area in recent years,some new reclamation projects cannot excavate the storage pit because of constraints or cost control.Through Changxing submerged breakwater engineering construction,we introduce the construction technology for integration of deep-water channel dredging and filling in the Yangtze River Estuary,and discuss the key technologies of dredging,anchoring and bowing.The construction technology does not need to set the storage pit,and the dredging soil could be pumped to the shore for land reclamation.It is very effective,resulting in a comprehensive benefit in the Yangtze River Estuary area.

Abstract:In Meizhou Bay Shimen’ao Land Reclamation Phase 1 Project(C bid),an alternative scheme was brought forward to fulfill the demand of forming reclamation area quickly with hydraulic filling conditions,which the original design couldn’t realize.By analyzing soil quality within sand borrowing area,the optimal scheme of cutter suctiou dredger(CSD)pumping sand directly to build reclamation weir was adopted,which fulfilled the project requirements,saved cost,shortened duration and maximized the overall efficiency of CSD.