Abstract:Based on the information from the shipping management system (VTS) and the statistical data on the Yangtze River cargo transport from the Ministry of Transport,this paper analyzes the operating conditions and characteristics of the 12.5 m navigation channel,and discusses the strategy and suggestion on alleviating the navigable pressure of the deepwater channel.The research shows that the Yangtze estuary waterway cargo’s throughput achieves a rapid growth and the trend of “heavy in-light out” is more obvious.The ship operation organization changes to a certain extent,and the trend of ship enlargement becomes obvious.Especially,the number of over control type ship (the width is over 45 m) grows up sharply,and the bidirectional navigation ability of the 12.5 m main channel is insufficient.For relieving the navigation pressure of the Yangtze estuary deepwater channel in the current and next period of time,the execution pace of the Yangtze estuary waterway system construction should be accelerated,and the research on the feasibility of main channel’s broadening of the Yangtze estuary is strengthened in time.

Abstract:The active ground consolidator is a new energy-dissipating & shore-protecting structure,which is for the first time applied to the 12.5 m deepwater channel of the Yangtze River below Nanjing city.This paper analyzes the on-site assembly of the active ground consolidators,compares the installing efficiency by machine and by man,and concludes with the effect of scour-preventing,depositing-promoting,dune-consolidating,foreshore-protecting as well as ecological conservation of active ground consolidators.

Abstract:The predictor-corrector-iteration algorithm in the framework of finite difference method was applied to solve one-dimensional version of two-layer Boussinesq equations,creating a numerical wave tank for focusing wave in time domain.A fourth-order composite Adams-Bashforth-Mouton scheme was adopted for time integration.The internal wave method of summing multi-frequency wave components was used to realize wave focusing in computational domain.Numerical experiments were conduct to reproduce the laboratory measurements of Baldock,and the agreements between the computed results and experimental data were good.Further discussions were carried out to investigate nonlinear effect on the computed results of focusing wave by considering different levels of nonlinearity (strong nonlinearity,weak nonlinearity and linearity) in the numerical model.The results show that nonlinearity plays a very important role in accurately modeling focusing wave.The present model with strong nonlinear terms presents the best results,the weakly nonlinearity presents reasonable results,while the linear model presents the worst.

Abstract:Based on Biot seepage consolidation theory and wave diffraction theory,the analytical solutions to the diffracted water wave potentials and the wave-induced seepage pressures referring to vertical breakwater resting on permeable elastic seabed are derived by applying the eigenfunction expansion approach,and then the wave-induced lift force and overturning moment caused by the seepage pressure on the bottom of vertical breakwater are accordingly evaluated and compared with the direct wave force and moment.The numerical results demonstrate that in certain condition,the wave-induced seepage loads may have the same order of magnitude as the direct wave loads.The variation of incident wave angle,porous on the front surface of breakwater and structure geometry under ocean condition may have some influences on wave-induced seepage loads,especially on the wave-induced seepage overturning moment.

Abstract:This paper investigates the impact factors of permeable pile structure (including wave steepness,the relative immersed depth of the piled baffle and openings) using the physical model experiment method,and gives the influential law of various factors on the transmission coefficient.The experimental result indicates that the relative immersed depth of the piled baffle and wave steepness have a negative correlation with the transmission coefficient.The impact of baffle openings for the transmission coefficient is relatively small,but it can effectively reduce the wave forces.Comparing the experimental result with various wave transmission coefficients’ theoretical formula and empirical formula given by the specification,the Wiegel formula matches well with the result got in this study,so it can be used for reference for the design.

Abstract:Two methods for calculating the ship wave’s effect on the moored ship are introduced.Combining with a 75 000 DWT coal terminal in Pakistan and adopting the Flory-Remery method using OPTIMOOR software,we analyze the effect of the ship wave load on the ship moored on the jetty which is near to fairway,and give the critical speed of the passing ship when the normal operation of the moored ship is not affected.

Abstract:Nautical silt specific weight is the key for both nautical resources and nautical depth.Taking Lianyungang port for example,the Lianyungang port sediment silt-site sampling and analysis are carried out.The mud rheology test,resistance test ship models and laminar-turbulent flow pattern changing theory,and nautical specific weight,which is the most important parameter for nautical resources,are analyzed .The results of Lianyungang port nautical specific weight are obtained and recommended values are proposed.

Abstract:The data from small vessels turning circle were used to analyze the scale of the turning circle in the original Chinese code.In order to verify whether the provisions of the code is available for the large vessel’s turning around,we carry out a large number of full-scale large vessel observation tests in many typical ports in China，and obtain the sample data of 57 large vessels’ turning circles.Based on the statistical analysis of these data,we get some regularity conclusions about the turning circle of the large vessel,which provides a technical support for the revision of the codes.

Abstract:Wharf slopes are often formed by the natural soil sedimentation.Soil parameters are space-variable,and the soil localized point variability can be changed to spatial variability based on the random field theory.The soil character random field is a stationary random field,and correlation distance is an important parameter which can reflect characteristics of the field.Based on the random field theory,CPT data has been used,then according to the relevant function method,the correlation distance of wharves soil is fitted and solved,and the work lays a foundation for the reliability study on the wharf slopes.

Abstract:Based on the previous research on wave forces of perforated caisson，we further study wave forces at the forefront of the perforated caisson with permeable superstructure through physical model tests of irregular waves.Analyzing the regular pattern of pressure distribution and comparing it with the existing formula of wave pressure,we find that the formula can be modified based on the Aida Yoshizane formula which is applied to the calculation of the pressure distribution of the upper structure’s panel and the forefront of the lower part of perforated caisson with permeable superstructure.The stringers of the upper structure suffer greater relative point pressure.So,the relative wave pressure of stringers is studied separately and the empirical formula for calculating relative wave pressure is provided here.

Abstract:Based on the traditional testing technology of the new deepwater sheet pile wharf structure,we illustrate new testing technologies of ground penetrating radar (GPR),impact-echo method,and seismic wave CT.Through the project example,we probe into the application of the new testing technology for inspection of the qualities of unloading-board,underwater beam-slab and underground continuous wall,to provide a technical guidance for the overall or special detection of the sheet pile wharf and improve the safety ensurence of construction and operation of the sheet pile wharf.

Abstract:Using numerical simulation method,we analyze the load transfer and distribution of high-piled wharf under the static and dynamic load and know that the transfer of axial force & bending moment under the dynamic load is the same with the static load in a certain time range.So,according to the dynamic test data we can analyze the joints’connection status.Research results can provide reference for the test and evaluation of high-piled wharf joints’performance.

Abstract:This paper discusses the variation law of factors (metacentric radius,distance from the gravity center to the buoyant center,metacentric height and draft of caisson) impacting the floating stability of the rectangular caisson with the change of the unit weight of concrete and the height of ballast water in the front compartments of the caisson in some port.The results show that if the ballast water in front compartments of the caisson remains the same,the metacentric radius and the distance from the gravity center to the buoyant center will decrease with the increase of unit weight of concrete,but the metacentric height and the draft of caisson will increase.The initial stable equilibrium of the caisson will be changed into unstable equilibrium because of higher water level in the front compartments of the caisson.The risk is not included in the codes and should be considered in design.The decrease of the height of ballast water in the front compartments of the caisson under the premise of satisfying the floating stability is necessary for the construction.

Abstract:According to the results of a sloping seawall model test,we obtaine the fitting formula.Using the fitting formula,standard formula and empirical formula given by researchers,we calculate the secondary wave height produced by overtopping of the the sloping seawall under a different crest elevation,and compare the results with the model test,from which we know that the result by the fitting formula and test results are close most to each other;we also analyze the reason why the results from other fitting formulae are not consistent with the test result.The results may serve as reference for the secondary wave height calculation and model test of other slopping seawalls which allow the overtopping during the crest elevation design.

Abstract:Based on the physical model test,we measure the wave-overtopping of a sloping breakwater and wave height at the inner side of the breakwater and analyze the adjustment of the top elevation and the effect of variation of the wave berm and armor block’s top width on the wave-breaking effect of the breakwater.The research result provides a scientific basis for the engineering design and may serve as reference for similar port construction engineering as well.

Abstract:The yacht dock is a new structure form in China.In order to facilitate the getting on and off the yacht,the yacht docks are mostly floating structures and the guiding pile is widely used as a type of anchorage.The displacement caused under the horizontal load is large on the all-straight-pile yacht.Besides,the floating dock’s mass itself is also small.So it is easy to cause the dynamic response of the wharf structure under the harmonic wave load or berthing impact.Thereby,it will increase the guiding pile’s internal force and reduce the structure safety.The paper analyzes the dynamic response of the guiding-pile yacht under the berthing and wave load by the method of finite element and on the basic of the theory.The paper also derives the simple calculation method for the piece of yacht wharf structure,which lays a basis for the design work.

Abstract:This paper mainly describes the innovation design of the gravity block quay wall with relieving slab combining some project cases.Since the reliving slab of existing quay is longer than usual,the increasing apron uniform load causes a greater stress backward on the top surface of the foundation bed,whose bearing capacity cannot meet the requirements of relevant codes.The transformation scheme reduces the load of relieving slab cantilever and prevents a greater stress backward through driving cast-in-place piles and casting reinforcement concrete slabs,which can provide a reference for similar quay transformation in the future.

Abstract:The top elevation of breakwater is one of the main factors of breakwater construction cost under certain geologic condition and breakwater cross section type.Analyzing the Concession Agreement and Employer’s Requirements[WTBZ] for the breakwater,and considering the landscape requirements,we determine that the breakwater top elevation shall be between 3.0～4.0 m;Analyzing the natural conditions and design elements of the engineering area,we determine the structural type of the breakwater;Under the allowable wave overtopping,we calculate the the scope of breakwater’s top elevation;By 2-D stability physical model tests and 3-D physical model test,we verify the stability of armor blocks and the artificial beach’s sediment change,and measure the wave height after the breakwater caused by different locations of diffraction wave or secondary wave height;Comparing the construction quantities and construction technology,we select the optimal elevation,which may serve as reference for the engineering design.

Abstract:Diaobang fishing port is an important part of Wenling central fishing port,and its breakwater’s armor structure is seriously damaged by the ultra-strong typhoon “Kanu” & ”Matsa” and thus exists security risks.The repairing technical difficulty lies in the dispose of thousands of artificial blocks.Testing the section model of wave and then determining the design drawings,we adopt the new technology of forming cushion after block decomposition to solve the technical difficulties of repairing project.After completion of the repairing and strengthening project,the resilience of Diaobang fishing port has been increased to 100 years once.

Abstract:This paper introduces researches on main problems including the layout and working process reform,reinforcement and reconstruction technology and slope stabilization in the reinforcement and reconstruction of built piled wharf of Ningbo Guangming No.1 berth,and gives the final scheme,which is safe,with less disturbance on the normal work,economical and reliable.Thus it may serve as reference for similar engineering.

Abstract:The precipitation and waterproof play an important role in the stability of the foundation.Based on Doha Newport in Qatar,we simulate the effects of deep shaft in the excavated basin,and optimize the flow of ground water,the distances between wells,the depth and diameter of wells.

Abstract:The second Minjiang river bridge to be built locates 1.4 km downstream of Zhushitan,the 215 m-long main navigable hole of which locates on the right side of the channel,and the linking of which to the new groove faces a big problem.At present,the old groove is not deep enough for the passing of large transport ships.The 2-D flow sediment mathematical model is established,and the similarity is verified by the measured data.The calculating results of the water line,the velocity distribution and the river bed scour are consistent with the measured data,so the accuracy meets the specification requirements.To reach the IV channel standard and meet the need of large transport ships,we compare the schemes of old groove and new groove.The results show that the mathematical model can simulate the movement of the river flow and sediment deposition process of navigation channel.It shows that three schemes all have their own advantages and disadvantages from the regulation effect (the flow condition for navigation,navigation channel stability,etc.).Relatively speaking,the old groove scheme is better,since it can meet the requirements of the channel’s navigation condition.

Abstract:The Hanzhuang line and twin-lane locks use the same lower approach channel and produce complex unsteady flow in filling and draining water.To ensure that the ships’ safe sailing and berthing,we probe into the complex unsteady flow of lower approach channel in different upstream and downstream level combinations by MIKE21 hydrodynamic model,simulating the distribution of the longitudinal velocity,the lateral velocity and the circulation flow.The result shows that Hanzhuang line and the twin-lane locks don’t meet the navigation requirements during the flood period.In view of the hydraulics problems of flood period,we put forward the effective engineering measures using grille and local dredging.

Abstract:Taking Zhushi rapids in the Minjiang river for example,we analyze the impacts of large-scale sand dredging on the riverbed evolution and channel conditions of rapids at the curved channel.The riverbed erosion of Zhushi rapids maintained a balance before the sand dredging.The riverbed erosion balance was destroyed and the riverbed dropped severely after the sand dredging.The severe siltation happened from the upstream to the downstream in the flood season.The impacts of large-scale sand dredging on the channel conditions are destroying channel boundary,reducing river water level,increasing upstream water surface slope,etc.The original stable curved channel was abandoned due to the lack of water depth.Waterway changed to go unstable straight channel,which created difficulties for the channel maintenance.Sand dredging also resulted in disordering of riverbed topography and big cross-flow in waterway,which is dangerous for the ships sailing.

Abstract:To provide a technical support for the regulation work of Liyushan waterway in the mid-reach of the Yangtze River,we research the regulation principles and implementation schemes.Based on the analysis of the recent navigational conditions of Liyushan waterway and its negative evolution tendency,we propose the regulation principles,i.e.,taking the north channel as the main navigation channel,to stabilize the current river regime and channel-shoal layout by protective engineering,control the development of the south channel and improve the navigation condition of the north channel.With the help of physical model tests,we recommend the general regulation scheme for the waterway regulation,which ensures to satisfy the planned channel dimensions of year 2020.

Abstract:The lock chamber floor with filling culvert and energy dissipation facilities possesses the characteristics of 3D.According to method of the frame on elastic foundation or frame on uniform foundation in Lock hydraulic structure design specification,it is difficult to determine the stiffness of the frames and the 3D stress characteristics of floor is unable to simulate.This paper analyzes the force of ship’s lock chamber floor with filling culvert,and establishes the 3D finite element model by FEM analysis software,and calculates the stress and displacement of lock chamber floor.

Abstract:Taking Zhuzhou second-lane shiplock peoject for example,we discuss the thoughts and methods of arrangement for the shiplock axis,and study the relationship between the influence on the safety of the first-lane lock members due to the axial space and the bridge construction scheme.Technical and economic evaluations of different axis arrangements are carried out,which may serve as reference for other projects.

Abstract:Hanzhuang double way locks shares the approach channel and its filling and discharging will generate unsteady flow in the downstream approach channel.During flood discharge of Hanzhuang sluice and the old canal sluice,the flow conditions of approach channel are more complex.This study uses international general MIKE21 hydrodynamic model to study the longitudinal velocity,transverse velocity and reflux distribution of approach channel,waiting area and entrance of approach channel of the downstream Hanzhuang double way locks.In accordance with the Code for Master design of shiplocks,to solve the problem of hydraulic during flood discharge,this study proposes effective engineering measures for improving the flow conditions.

Abstract:This paper proposes the flexural capacity formula of reinforced concrete beams strengthened with CFRP or steel plate based on the material strength factor and the experimental data.The research results show that the beam strengthened with steel plate has better strengthening effect in the flexural capacity than that with CFRP.

Abstract:The shallow rapid reinforcement technology based on the vacuum preloading principle is a new technology of rapid reinforcement technique for the new reclamation silt.Relying on Huizhou Quanwan port soft foundation treatment engineering,we study the influence of different drainage plate spacings on the shallow rapid reinforcement effect by the field test.We also study the rules of the process of strengthening about the vacuity under the membrane and the surface settlement and pore water pressure,and analyze the soil physical and mechanical properties,strength and bearing capacity of foundation before and after the reinforcement.

Abstract:It’s extremely difficult to clean up residual sand from the filtration wells after backfill construction is completed in buttresses gravity wharf.The partial replacement method is studied based on the second oil service base and heavy cargo wharf project engineering,Luanda,Angola.A barrier layer between the backfill sand and buttresses is formed,which blocks the backfill sand to filter down flowing wells and cleans the residual sand filter wells efficiently and completely .

Abstract:The pile-drilling platform formed with the support of steel casing can adapt to complex engineering geologic conditions,reduce the use of large vessels and machinery,speed up the construction schedule and avoid the deformation of steel casing caused by concrete striking into it.By controlling the position and size of frothing orifice and adjusting the workability of the anchorage concrete,we can ensure that the steel casing get enough frothing height and thus form a rigid node of sufficient length between the steel casing and the bedrock to guarantee the stability of the single pile with steel casing during the flood period.

Abstract:The concrete pipe pile is likely to be damaged to form circular or vertical cracks during construction and operation due to its concrete structure.Such cracks mainly occur within water level fluctuation area and above,also underwater even under the mud level.The above-water maintenance and strengthening technique is unable to be directly applied to the underwater construction due to the restriction of technology and construction conditions.Combining with wharf engineering cases,we propose the technology of applying the steel casing outside the pipe pile and then concreting to form similar steel casing concrete pipe pile structure for the maintenance and strengthening of the cracks.

Abstract:This paper probes into the optimization design of the sedimentation tank design in the project of new port’s large excavated basin in Doha,Qatar.According to high standards on environmental protection and relevant laws and regulations,we determine the overall design for the sedimentation tank,which may serve as reference for the overseas construction engineering,esp.in the Middle East.

Abstract:The tendency of deep water and offshore wharf construction leads to the enlargement of the upper precast beam slab.However,due to severe offshore conditions,the installation process by conventional rigging boat is insufficient in ensuring accuracy.Taking Dongjiagang 400 000 ton class mining wharf of Qingdao port for example,we introduce a complete set of accurate installation process for 500 t precast box girder at offshore,which mainly includes a combination adoption of offshore tower crane,3-D jack and beam-adjustment lever.

Abstract:The shallows development in the Yangtze River downstream utilizes the flexible mattress to protect the foundation.Due to the large beach topography of the shallows,tidal influence and bad depth conditions,it is difficult for the flexible mattress’ construction and targeted construction ship machines and construction technology shall be chosen.Based on the conditions of the flexible mattress construction in the tidal river,this paper expounds the construction ship machines,construction technology and quality control points in the deepwater and shallow areas,especially,the gasbag is adopted to complete the construction of flexible mattress successfully in the shallow area,which provides reference for similar engineering construction of tidal flat reclamation.