Abstract:Low-frequency waves generated by a submerged curvilinear sill due to bichromatic wave groups with and without an opposing current are studied experimentally in a laboratory flume.Second-order wave maker theory is used in the generation of the primary waves and the spurious long waves are significantly suppressed.The generation of harmonics,wave blocking of the short waves and especially the penetration of long waves through the “blocking point” are observed.The evolution of long waves before and after the blocking point is described in detail.

Abstract:To study the specialties of wave slamming on beam-plate structures,we establish two-dimensional regular wave numerical models based on software FLUENT.Adopting RANS equations and standard equations,VOF method is used to reconstruct the free surface.Comparing typical cases of wave slamming on beam-plate structures,we verify the models by experimental data.With plentiful simulation,we carry out the parametric studies for different wave steepness,structure geometry and the distance between underside of horizontal plate and still water level,and get to know the influences of the three parameters on the impact pressure.Finally,the pressure formulae are improved based on the original calculation formulae of Hohai University.The work is significant for accurately predicting the impact load and mastering more impact mechanism.

Abstract:According to the Coast Reclamation Plan (2010—2020),we adopt the currently advanced third-generation wave model SWAN to simulate the wave fields before and after the reclamation engineering in summer,winter and typhoon period,which are verified by the effective wave data obtained by the Jason-1 altimeter,to analyze the impact of Jiangsu coastal reclamation on the Jiangsu nearshore wave field in province.Results show that the significant wave height and period keep unchanged basically in the northern area after implementation of reclamation,while the significant wave height and period vary greatly in the southern sea area.But the impact is limited and it’s magnitude is small.

Abstract:This paper investigates the impact of irregular waves under a 300 000 t tanker collision energy by physical model test and analyzes the main factors’impact on collision velocity including H/T,L/B,T/T0,D.The result indicates that the collision speed is proportional to H/T and T/T0,and is powered to L/B.When T/T0=1,the collision and wave resonates,which causes the greatest velocity.The collision speed when the tanker is ballast is larger than that when it is fully loaded.In another word,the collision speed is negatively correlated with the draft.A formula for the 300 000 t tanker collision energy is proposed and compared to the result by physical model test of Qingdao port oil wharf phase III project and Qingdao Yijia Group oil terminal project,which has better accuracy and can be used for reference for design.

Abstract:To explore the feasibility and superiority of CT scanning technology in engineering detection,we make CT scanning for the typical fracture and fatigue loading,corrosive cracks and site concrete member and obtain the CT image for typical disease of components.The experimental analysis shows that a CT scan imaging can visualize the inside concrete defects and damages and carries on the quantitative analysis.With the development of CT scanners,portable CT will appear in the future,and CT scanning technology will play an important role in the concrete structure detection.

Abstract:Adopting wave sectional physical model test and numeral model test coupling,we study the wave calculation method for the water area sheltered by the riprap submerged dike.The wave height of the water area sheltered by the submerged dike consists of the regeneration wave,diffracted wave from the entrance between submerged dikes and the wind wave of small fetch.The main factors are the structure of dike,wave feature and the length of the fetch.The calculation results of the numeral model are verified using the coupling model and according to the results of physical model test.Considering the overtopping wave height along the transmission attenuation,the energy consumption during the interaction of wave and structure,etc.,we calculate directly the design wave in front of the dike by adjusting the wave breaking index and parameters of wave energy dissipation.The results of the study are more realistic and thus provide a scientific basis for the engineering design.

Abstract:To simulate the wave in coastal areas of Jiangsu more accurately,this paper combines the measured wave spectrum of north Jiangsu with the SWAN model.In the case of cold wave weather,with the wind field data provided by CCMP,we simulate the wave field in coastal areas of north Jiangsu using the measured wave spectrum and spectrum by defaut respectively.The result demonstrates that the simulation with measured wave spectrum is in good agreement with the observed data.Calculating the wave field of the engineering region in Jiangsu province using the measured wave spectrum of north Jiangsu,we get the reasonable result.

Abstract:A three-dimensional finite element is built to analyze the structure deformation performances,the internal force distribution,base stress distribution and earth pressure distribution between structure and soil.The finite calculation result and criterion calculation result are compared and analyzed.Results show that the finite calculation result of the earth pressure appears in the “convex curve”,which is closer to the actual conditions,and the boundary settlement is less than the center settlement which is the same as that by the layer-wise summation method.

Abstract:Taking the composite sea embankment arc crown wall as the research object,three main factors,including water depth,wave period and wave height,were chosen to carry out the orthogonal test.Sixteen test schemes were designed by choosing four levels to each parameter stated above by L16（43）orthogonal table to study the influencing significancy of the wave loads on composite sea embankment arc crown wall.Meanwhile,the wave pressure distribution and schedule change rule of wave loads are studied.The results show that there’s no fixed relationship between each two point pressures for the wave pressure distribution.However,the wave pressure on the lower part of the arc crown wall surface is generally greater than that of the upper part as a whole;In the process of a single wave cycle,the horizontal wave force has two peaks,while there are three peaks of the vertical force.The second peak of vertical wave load and the first peak of horizontal wave load appear almost simultaneously,which is the worst moment for the stability of the arc crown wall;The effect of water depth on arc crown wall wave loads is the most significant,that of wave height secondly,and the impact of wave period is relatively minimal.

Abstract:Based on the basic principle of strain energy,we establish the framework wharf three-dimensional finite element model and calculate the structure strain energy in the condition of flexible work of five kinds of impact forces.The results show that the main force transmission route of horizontal force along the transverse of the wharf is from the direct stressed component to the adjacent transverse components,and then the front row or back row pile foundation.The main force transmission route of horizontal force along the longitudinal direction of the wharf is from the direct stressed component to the longitudinal components closest to the acting position.The structure stores the maximum strain energy when the impact force is applied to the high water level，therefore it is proposed to check the structural stability in high water conditions;The strain energy of the peripheral components are larger，especially the front row or back row pile foundation,river-side transverse members and longitudinal member connected with the back pile.In other words,the force mainly passes through the peripheral components of wharf structure，and these components should be designed as the control components.

Abstract:According to a practical application on the third and fourth stage projects of Huanghua terminal coal area,this paper analyzes the reasonable throughput capacity based on the port service level evaluation index and offers a scientific support for the planning and design of this project by analyzing systematically the new ship-loading operation pattern of coal terminal,i.e.bilateral sides berthing,ship-loader whole rotating operation,and building a computer simulation model.

Abstract:The nonlinear Finite Element Method (FEM),which is convenient for engineering applications to the pontoon-chain system,is introduced to simulate the large deformation and contact behavior with mud plane for mooring chains.According to the calculation flow given,quasi-static analysis can be carried out to get the displacement and tensile force of pontoon-chain system under external load with water level variation.A practical case,a floating yard of the MSA somewhere,is analyzed to validate the applicability and practical value of the method presented.

Abstract:According to the wave characteristics of Dianchi lake,we build a wave propagation numerical model on the basis of the wave energy balance and wave action conservation equations.The model validation shows that the numerical results coordinates well with the ones by the empirical formula,and the numerical model is used to calculate the wind wave fields in the project area under the designed wind field before and after construction of the pier,which provides basic parameters for the schemes selection.The calculated results show that the north(N)wind wave has a great influence on the project while the WSW wind wave has less influence,and the L-shaped floating bridge has a better effect of blocking wave than the T-shaped one.

Abstract:Hengsha east shoal is a large underwater bank located at the east side of Hengsha island.Hengsha east shoal,together with Chongming eastern shoal and Jiuduan shoal are three largest shoals in the Yangtze mouth-bar area.The Hengsha east shoal is an ideal area for port construction because of its stable location and seabed form.A 3-D tidal-sediment model is used to simulate the current dynamics and sediment transport with a dig-in harbor basin built at the Hengsha east shoal.The changes of tidal current and sediment flux before and after the project are compared to analyze the impact of port-building.

Abstract:The evolution of Baimaoxiaosha in recent years,changes in trends and their implications are analyzed in terms of riverbed erosion and section changes.Studies suggest that because of runoff and sediment conditions change,ebb and flow passage separating and human disturbance,the overall evolution of Baimaoxiaosha appears that the sandy surface elevation reduces in the upper sand and the tail-part lifts,and the lower sand is washed out.It is expected that Baimaoxiaosha would be in a natural state of change,but the change will gradually slow down.After washout of the lower sand,the best chance for regulations lost.It is suggested to strengthen observation to analyze the impact on the river regime and water engineering nearby.

Abstract:Due to lack of research on the construction condition of the artificial deep-water channel in the radial sand ridges area of the south Yellow Sea,we analyze comprehensively the construction condition of Lyusi artificial 100 000 DWT deep-water channel based on the research on water flow condition,sediment condition,seabed evolution and siltation intensity.The results show that the water flow is strong and seabed is stable.Furthermore,the results of the trial dredged channel observation and back silting prediction show that the siltation intensity is not serious under normal weather,and even under 5-year frequency wind.So it’s basically suitable for constructing 100 000 DWT deep-water channel at the southern channel of Xiaomiaohong waterway.

Abstract:Considering concrete plastic change,we build a three-dimensional finite element model of lock chamber-foundation with ABAQUS.Regarding a lock chamber on the soft base as a basic computing structure,we analyze the stress distribution and deformation characteristics under different working conditions of elastic model and elastoplastic model.The results show that the elastoplastic model is conservative,which can provide reference for the reinforcement design.

Abstract:As a secondary inlet of the Yangtze estuary,the north channel experienced several large-scale hydraulic projects in recent decades,such as sand stabilization project in the separating pass of the south and north channels,Qingcaosha reservoir project and siltation promotion project in the Hengsha east shoal,etc.,which made the river regime more stable to some extent.Meanwhile,many new unexpected situations occurred following them,especially under the background of drastic decline in river sediment supply.The stability of sand bodies over the south side of Xingqiao channel was enhanced during the sand stabilization project in the separating pass of the south and north channels.However,the spilt ratio of the north channel decreased owing to the northward movement of the Biandansha shoal in this period.After the project of Qingcaosha reservoir,the upper part of the north channel kept scouring,with the development of Hengsha passage,the channel’s curvature increased.Due to the siltation promotion project in the Hengsha east shoal as well as the natural deposition in the north channel mouth bar area,the north-inlet of the north channel developed.However,the water-intaking program of “avoiding saltwater and storing freshwater” was seriously influenced by the strong flood current in this inlet.

Abstract:For the channel improvement project with the shiplock enduring bilateral water head action or to meet the needs of specific-period flood control required by water administrative sector,sometimes it need be equipped with open shiplock to hold the back water.As the shiplock’s passing capability is generally less than that of channels,which is likely to create the bottleneck of navigation,the shiplock passing capability becomes a key point of channel improvement projects.Taking Danjin shiplock as a research object,this paper analyzes and compares the electro-mechanical system of the gate,water supply system and layout plan with a view of giving reference for carrying out similar projects in water networks of plain areas and improving shiplock standards and norms.

Abstract:Xin’gan hydro-junction is the fifth junction on Ganzhou downstream of the Ganjiang River.It has the functions of navigation,electric power generation and other social benefits.The main structures include shiplock,water release gates,power house,fish passage and earth-filled dam.The riverway section,where the hydro-junction is located in,is straight.There are problems to be solved when the shiplock is placed on the right or left side of the river.The general layout of Xin’gan hydro-junction is discussed from aspects including topographical and geological condition of site,navigation conditions,reserved for the second-line shiplock,removing houses,project investment,etc.The upstream and downstream flow conditions are researched,including the power house,entrance of shiplock approaching channel and so on.The plan of “shiplock on the left and power house on the right” is recommended based on general demonstration.

Abstract:Taking the phase I Shipu navigational channel project in Ningbo-Zhoushan port for example,we analyze the unfavorable factors for channel designing under complicated geologic conditions.Furthermore,a series of main scale parameters of channel designing,such as depth,width and turning radius,are calculated based on the formulas given by the specification in operation referring to the Guide for Design of Approach Channels (PIANC).The recommended results are proved by ship maneuvering simulator experiment.The conclusions may serve as reference for the channel engineering design.

Abstract:In Yuandong ship lock expansion project,we establish a physical model of 1：40 scale ratio to study the long wave movement,water surface slope,velocity distribution,and backflow intensity when the lock empties and afterwards.The results show that the reverse water head at the miter gate is 0.39 m,and the longitudinal surface velocity at the mooring site is 0.62 m/s under the designed condition.These values are beyond relevant standards,so measures shall be taken to improve the navigation condition.

Abstract:Based on the systematic engineering concept,we put forward for the first time the theory of Building Information Modeling (BIM) plus to guide the ship lock construction.Integrating BIM and 3-D printing,hydraulic simulation and internet,we carry out the planning,design,construction and operation management of the ship lock project and thus realize a new mode for constructing the ship lock based on BIM plus.The engineering practices prove that this new mode is simple with high efficiency,and solves the construction difficulties of complex ship lock structure easily.Therefore this mode has a vast application prospect and may serve as the theoretical guide and technical reference for similar projects.

Abstract:The three-dimensional visualization management and control system of coal terminal is built based on virtual reality technology,information technology and network technology.The system is designed with data connection to port operation and management system.In the enviroment of network,real-time status display of port operation,real-time information query and equipment fast positioning and emergency alarm in the process of port operation can be achieved.The system provides an intuitive and interactive platform assisting analysis and decision-making for coal terminal management.The system is validated to be advanced and practical through its application in huanghua coal terminal.

Abstract:Virtual visualization technology research and related application is a research hotspot in today’s computer field,which also provides effective means for realizing harbor scene simulation.Based on the Open Flight hierarchies and Vega Prime Visual simulation,this paper analyzes the system architecture design and scene database optimization management and builds the digital port.Using the Vega API in Visual C++ environment,the real-time roaming process of the port is realized.With the improved berth allocation algorithm,this research opens up a new way for port construction and traffic management,and the future real visual simulation of the emergency command decision.

Abstract:The no-sand vacuum preloading technique is proved unsatisfactory for improving the newly-reclaimed mud foundation,so we analyze the reasons from both objective factors and subjective factors.The result reveals that ：1) The physical characteristics and permeability coefficient of newly-reclaimed mud are the objective factors,which lead to the difficulty of vacuum drainage consolidation and serious barriers with low permeability around the PVDs during vacuum preloading,and thus result in unsatisfactory improving effect.2) The performances of PVDs and horizontal drainage system are the objective factors.The characteristic opening size of filter stipulated in de current code is too small (O95＜0.075 mm),and the curvature of vertical drains and transfer resistance in horizontal drains are too large,these also results in the poor improving effect.3)The winding-connecting part of horizontal drainage system should be buried in filling/ fine/ medium fine/ medium coarse horizontal drainage to improve its three-dimensional permeable effect.

Abstract:Settlement observation and calculation of degree of consolidation are carried out for the soft foundation under the riprap border dike in Xuwei port area in Lianyungang.The border dike can’t break the water surface after sand quilt and drainage plate construction,and the cumulative settlement is lost when putting the settlement plate at the lowest tidal level,and the degree of consolidation is relatively small.Thus the drilling method before and after construction is applied to achieve the real settlement and degree of consolidation.Moreover,putting the settlement plate before the riprap construction with the enclosure protection method using steel reinforcement cage frame plus gravel bag,we can get the relatively correct settlement and degree of consolidation,so it is worthy of popularizing.

Abstract:Based on the theoretical understanding and engineering practice,we analyze the variation characteristics of pore water pressure dissipation,settlement,physical properties and strength properties of vacuum-preloaded foundation soil,which indicates that：The value of pore water pressure dissipation is affected significantly by curving and clogging of PVD caused by disturbances of soil structure and settlement,making it do not simply decrease with the increase of the depth;The empirical coefficient of dredger fill can be a little larger,and the undisturbed soil can be a little smaller;The physical properties and the strength properties are improved obliviously,and the soil under the depth of drain boards are also improved.According to the analyzing result of the monitoring data,we discuss the effective depth and strengthening effect of vacuum preloading method,which reveals that：The effective strengthen depth of soil is affected by the value of vacuum and drainage resistance;The strengthening effect of soil within the depth range of drainage board is obvious,and that below the depth range of drainage board will reduce gradually with the depth increase and reach to no effect at last.

Abstract:To reduce effectively the design and construction risks of rock-socketed piles in port and waterway engineering and save the engineering cost,we can determine the pile length by the graphic checking method,and obtain the minimum distance and corresponding coordinate of points considering the deviation of pile top,the inclination angle and torsional angle of the longitudinal axis by the formula checking method based on programming,thus to meet the design and construction demands of pile calculation and optimization adjustment of rock-socketed piles.

Abstract:The driving process of prefabricated piles of a wharf in coastal areas is monitored.The result shows that due to the soil’s severe disturbance around the pile,the penetration resistance of pile is greatly reduced,and that of silty soil is higher than that of silty sand.The redriving test shows that the coefficient of restitution of silty soil is larger than that of silt,and kin friction along the pile is closely related to the pile side soil properties.Appropriate piling hammer shall be chosen according to the soil condition during pile-driving to reduce or avoid the adverse effects on the pile.

Abstract:As transparency of construction technology and cost of sheet pile wharf’s underground structure,competitiveness of sheet pile wharf is declined in the port construction market.Combining with 26#～27# container terminal project and previous engineering experience,we puts forward the concept of “time” and “space” in the construction process of sheet pile wharf’s underground structure.Through impact analysis on three aspects which are construction environment,process conditions,underground space disturbance,we get to the conclusion that the overall deployment of sheet pile wharf construction process is “from simple to complicated & double-line parallel construction”;we also deduce a calculation formula of trench stability under seepage action and give the safe distance of two-line parallel construction.

Abstract:During installing C-plastic drainage boards under Donghai bridge in Yangshan deepwater habor Phase IV eastern cofferdam engineering,the traditional plastic drainage board crawler installing machine is renovated and the installing technique is innovated,which results in the successful installation of plastic drainage boards using double casing pipes within the limited clearance under the bridge,and both the installing depth and construction quality satisfy the design requirements.

Abstract:This paper expounds the construction technique of post trenching,interlocking mattress at the suspended area,and clearing of sand bags concrete chain row and sandbags removal for the pipe sinking across waterway for subsea pipeline hazard remediation engineering,analyzes the safety risks of waterway-crossing contruction,and discusses the influence of the anchor position on the waterway,so as to take targeted prevention and emergency measures.

Abstract:The ripped-rock embankment is extensively used in construction of Caofeidian because of its simple construction,rapid construction,good adaptability,mature construction method,and high safety performance.However,gap is formed inevitably in the ripped-rock embankment construction,especially in the sea,all around without cover,and gap closure construction affected by the marine natural conditions has always been a difficulty.During construction of Huaneng Caofeidian coal terminal project,we simulate the possible current change process by mathematical model to provide reference for the choice of gap closure time and the setting of construction plan and thus ensure the stability of gap closure riprap in the process of construction.

Abstract:The stone column and surrounding soil form the composite foundation,and the stone column itself can be taken as the vertical drainage body to accelerate the consolidation of surrounding soft soil.This method can improve ground in a fast and environmentally friendly way.However,because of the restriction of construction method,this method cannot be used in slurry (vane shear strength less than 20 kPa) and in height restriction condition.This article introduces a new bottom-fed vibro-stone column,which forms the stone column in soft foundation with good quality.This method also break the barrier of height restriction of airport by extension tubes to reduce the device height.