Abstract:Based on the previous research on the classification criteria of different coasts,we carry out an in-depth research on the classification criteria of muddy and silty coasts according to the hydraulic experiment of sediment with clay content between 15% and 25%.It is shown that coasts with median diameter greater than 0.10 mm and clay content no better than 0% are defined as the sandy coast.The coasts with median diameter between 0.03 mm and 0.10 mm and clay content less than 10% are defined as the silty coasts.The coasts with median diameter less than 0.03 mm and clay content greater than or equal to 25% are defined as the muddy coasts,and that clay content ranging from 10% to 25% are defined as transition zone between muddy and silty coasts.The results provide a new case study for the application of the domestic and foreign research on the coastal engineering of the muddy coast.

Abstract:Through laboratory test and practical engineering application,the technique of testing and evaluating the reinforcement corrosion in concrete structure was studied based on the electrochemical synthesis method.The paper studied the rule of the impact on three electrochemical detection results of concrete resistivity,half-cell potential and corrosion current density by different corrosion conditions and test conditions through three groups of specimen tests and obtained a progressive assessment criteria to detect the state of reinforcement corrosion in concrete with the electrochemical synthesis method.It regarded the test item of a high-pile wharf as the research object,and detected the state of reinforcement corrosion in concrete with electrochemical synthesis method and comprehensively evaluated the situation of reinforcement corrosion according to progressive assessment criteria.The results show that the technique of testing and evaluating the reinforcement corrosion in concrete with the electrochemical synthesis method can effectively improve the accuracy and reliability in detecting the situation of reinforcement corrosion.

Abstract:The influences of temperature on the monitoring results of two commonly used durability monitoring sensors,ECI-2 sensor and anode-ladder sensor,are investigated.The results show that for ECI-2 sensor,the temperature could affect the potential of the Cl-probe and the linear polarization resistance dramatically,especially the linear polarization resistance,but the influence of temperature on the corrosion potential of rebar is tiny.For the anode-ladder sensor,the temperature could affect the resistance of concrete significantly.However,the influences of temperature on the corrosion potential and galvanic corrosion current are tiny.While both durability monitoring sensors are used to monitor the durability status of concrete structure,the monitoring results affected by temperature should be compensated dramatically.

Abstract:The addition of additives is a main factor influencing the workability of self-compacting concrete.Based on laboratory tests,the effects of non-shrinkage additives’ ZM content on the performance of self-compacting concrete for different mixture ratios are studied.Test results show that the water-reducing efficiency improves with the increase of ZM content.The saturation point of water-reducing of ZM content is within the range of 16% to 18%. The mechanical property and concrete performance of SCC are optimal when the ZM content is between 14% and 16%.

Abstract:In order to analyze the influence on the material measuring accuracy by the inertial acceleration caused by the wave-induced hull motion,a mixing vessel with production capacity of 200 m3?h was selected to analyze its hydrodynamic characteristic with SESAM software.Short-term predictions about the vertical acceleration at the measuring reference point were done,and the acceleration sensor was installed in the measuring deck layer.Through the actual measurement and according to the theory,the influence was confirmed to be existed.

Abstract:This paper proposed a simulation and evaluation method for the oil spilling risk in the spatial layout of regional oil dock based on the theory of uncertainty analysis.This method can be used to systematically analyze the spatial layout of oil dock along the costal region and figure out the spatial distribution rule of sea-area oil spilling risk caused by the layout,and can also satisfy the technical demand for strategic environmental assessment and environmental risk assessment under the current situation of offshore high-strength exploitation in China.It treated Zhoushan sea area as the research object to evaluate the comprehensive oil spilling risk by analyzing the layout model of oil dock and the uncertainty.The results show that this method can be used to comprehensively analyze the oil spilling risk level of a certain sea area,and can realize comprehensive comparison among sea-area oil spilling risk levels under many kinds of dock layout schemes,and get the optimal scheme for the oil dock layout based on the oil spilling risk probability and the temporal and spatial distribution of pollution damage,and according to the principle that the total risk value is the smallest if the concentration ratio of risk value is maximum.

Abstract:The axial azimuth influences directly the action of the berthing ship on the wharf structure,and thus influences the requirements on the structural design.So,it is necessary to make an optimization analysis on the axial azimuth of wharf for its influence on ship load and corresponding requirement in the structural design.Based on the practical engineering,a method named stratified flow factor is proposed to determine the optimum axial azimuth for wharf.This method and other two traditional methods are analyzed comparatively.Meantime,the relationship among the major factors of ship load,current velocity and axial azimuth is studied.The analysis result shows that the optimum axial azimuth is different from the three methods mentioned in this paper.The method of stratified flow factor is recommended for its more reality.

Abstract:Taking the sheet pile wharf project on soft soil foundation for example,we propose the sheet pile wharf design scheme using underground continuous wall as the front wall and concrete beams to connect the front and rear as a whole is proposed.Considering the material nonlinearity of the soft soil foundation,foundation soil adopts Duncan-Chang model.The sheet pile wharf stress distribution and deformation characteristics are analyzed by the finite element method.Moreover,front wall buried depth and the length of prestressed high strength concrete pile belonging to structure design scheme of the sheet pile wharf is researched.Different front wall buried depth and prestressed high strength concrete pile length can impact the sheet pile wharf stress and displacement.By analyzing the impact,the optimization result of front wall buried depth and prestressed high strength concrete pile length can be decided.Those results provide the basis of sheet pile wharf structure optimization in engineering practice.

Abstract:Considering the impact on the wharf slop and rear pile platform by the external loads such as ship impact force and cargo load,the finite element software,ABAQUS,was utilized to simulate the rear pile platform and slope soil mass used for arranging raking piles at the high-pile wharf,and the interaction between soil and pipe and the stability of structure were also analyzed.Through analysis on the simulation results of the cloud pictures about the displacement field,stress field,etc.,these results indicate that:the raking pile has better ability in bearing the horizontal load than bearing the vertical load,and it can well form a blind with vertical piles to guarantee the stability of slope soil mass and structures.

Abstract:By adding an annular hydraulic device between the ship-berthing pipe and batter pile,and partially separating the batter pile and major structure,a new type of floating ship-berthing system was proposed.The bearing capacities of ship-berthing pile and batter pile were also analyzed under the impact and load of ship by combing with the numerical simulation.Comparing with the existing high-pile wharf and floating ship-berthing system,this system has the advantages such as being convenient to use,protecting the pier body from being impacted,slowing down the descent rate dock carrying ability,etc.From the considerations of safety use and shipping economy,the new type of ship-berthing system is better in structure and safer in use,and can improve the wharf handling efficiency and has a broad application prospect.

Abstract:By physical model experiment which is performed under irregular wave and adopts accropode blocks on a sloped revetment,we study factors which affect the stability of accropode blocks including mode of placing,placing density,as well as the slope gradient,and obtain the void ratio of the revetment P under different modes of placing.We also give the value range of stability parameter KD under different placing modes of accropode blocks,density of accropode blocks and slope gradient.In addition,overtopping data is also analyzed,which may serve as reference for future design.

Abstract:To increase the foundation’s beating capacity of caisson structures on soft ground,we analyze the influences of various measures including increment of bed’s thickness (replacement of foundation),vibro-flotation gravel pile,increment of caisson’s width on the structure,and recommend the reasonable scheme.We also discuss problems to be paid attention to and relevant solutions to serve as reference for the engineering design.

Abstract:According to the force transmission characteristic of friction-type connection for the high-strength bolt,we analyzed the necessary conditions for the equal-strength connection of the whole section,and proposed the equal-strength coefficient for the friction-type connection node of high-strength bolt and the calculation method for the coefficient,and put forward the design principle that the net section coefficient should not be greater than the equal-strength coefficient to ensure the structural safety of the large-span truss in port engineering.

Abstract:According to the ro-ro transport characteristics,we analyze main factors considered in the general layout including the surrounding environment of Lushun port passenger-cargo ro-ro operation area,the relationship with the adjacent works,main transport types,transport organization form,as well as the parking lots layout,etc.,introduce the ideas for the general layout of Lushun port ro-ro operation area,and expound main points for the handling technology,parking lots arrangement,ans traffic organization.

Abstract:The Jiang’an second Yangtze River highway bridge under planning in Sichuan is adopted the diamond-shaped tandem-ranged cylindrical piers as its main towers. In order to study the influence on the navigable waterpower of the river reach under this bridge by the main tower piers,we built a 2D mathematical model for the flow to simulate the flow field before and after the scheme is implemented,and analyze the influence on the flow condition of this river reach by the tandem-ranged cylindrical piers from the view of engineering application.By analyzing the results of the mathematic model,we find that under different levels of flow,the changes of the water level and velocity in the river reach under the bridge are small,and the transverse flow velocity on the axis of the bridge is very slow,and the influence on the navigation flow condition by the construction of bridge is also small and will not affect the ship safely passing through the bridge area.

Abstract:This article researches the hydrodynamic condition in channel siltation at the mouth bars of the Yangtze estuary.From the research results,some perceptions are as follows:1)In the mouth bars,flow dynamic is the main power of erosion in the deep-water channel of north passage,and the erosion power generally enhances in the channel,after the 12.5 m channel at the Yangtze estuary being through.2)The correlation between the change of runoff and the siltation in the deepwater channel of north passage is not distinct.3)At the mouth bars of the Yangtze estuary,water flow is a kind of relatively stable power with periodic change;there is no obvious difference between flood season and dry season.4)Under the natural condition,the riverbed at the mouth bars of the Yangtze estuary is in a dynamic equilibrium which is resulted from the flow dynamic and wave dynamic.When it is only under the action of flow dynamic,the riverbed at the mouth bars of the Yangtze estuary is not in an equilibrium state any more,and the scouring depth tends to further develop in the main channel.

Abstract:To guarantee safety operation and accumulate experience of large ship lock,we carry out the prototype observation of the miter gates in the third-line ship lock of Changzhou hydro-junction.The results show that the hoisting device is reasonable during the commissioning stage when the water level is equal in and out of the lock,for the miter gate system runs steadily,and the gate closing and opening forces are much less than the rated capacity of the headstock gear.At the beginning of the operation commissioning stage,there exists a serious over filling(over emptying)phenomenon in the ship lock.The great force in piston rod of the miter gates easily exceeds the capacity value of headstock gear with the damaged hydraulic lever.After the centralized control automation is implemented,the over filling(over emptying)phenomenon is controlled to a great extent,and the force in piston rod of the miter gates is within the normal capacity.The prototype test is an effective approach to ensure the safe operation of the practical engineering.

Abstract:This paper did research on composite roughness in compound channels from the asymmetry and symmetry of cross-section morphology.Based on the analysis data from massive flume experiments and the influence on compound channel by channel geometry and relative water depth ratio(hf/Hm),this study developed a formula for composite roughness.From the results,it got that in a certain range,the composite roughness increases along with the increasing ratio of flood-plain width.Furthermore,through comparing the computational results when the cross-section morphology is symmetric with the computational results when the cross-section morphology is asymmetric,this research suggests that the composite roughness under the circumstance of symmetry is larger than that under the circumstance of symmetry.

Abstract:Based on the existing achievement of research on the bank collapse occurred in the middle and lower reaches of the Yangtze River,this paper probes into the situation of previous studies from three perspectives:the morphological study,the dynamic process of water and sediment and the slope stability.Meanwhile,it points out scientific problems needing further research,and suggests that the relationship between the evolution of river regime,soil properties and morphology of bank collapse,complex flow in the bank collapse section,accumulation at the foot of bank,accumulation and decomposition of collapsed soil will be further directions in the bank collapse research.

Abstract:Disorderly sand excavation activities in the river caused damages to the channel condition.It is essential to reduce the effects of sand excavation on the channel condition by regulating the way of sand excavation and protecting channel condition.Focusing on a sand excavation area of Manting Dashaba,and using average depth of two-dimensional finite element mathematical model,we optimize the original excavation scheme.In addition,some channel protection measures such as building beach protection engineering before excavation,controlling excavation elevation and adjusting excavation area are given.

Abstract:At the miter gate of large-scale ship lock,buoyancy tank is usually set to improve the stress state of operating parts of the top and bottom pivot,and to reduce the drooping volume of gate head.First of all,seven kinds of different buoyancy tanks of the rectangle,U type,⊥ type,L type,J type,T type and Π type were compared under the same buoyancy to analyze the features of bearing reaction of top and bottom pivot,drooping volume of gate head,natural frequency and ventilation path,and give a relative reasonable structural form of buoyancy tank.On this basis,five kinds of buoyancy tanks of one layer,one and a half layer,two layers,three layers,and four layers with different buoyancy forces were compared to analyze and give a relatively reasonable control range for the buoyancy force of buoyancy tank.

Abstract:Taking a chamber structure on rock foundation for example,we discuss the stress characteristics of the keyway lock chamber and the dock lock chamber.Surface to surface contact element Targe170 and Conta173 are applied to simulate the nonlinear contact of keyway and analyze the stress,moment and foundation stress of the keyway lock chamber under four working conditions:inspection condition,low water condition,finished condition and high water condition,and compare with the dock chamber.It is shown that the stress,moment,and foundation stress rules of keyway chamber are similar to the dock chamber,and its value are small under the inspection condition and low water condition,and the bottom center has a greater negative moment under the inspection condition.While under the finished condition the bottom positive moment of two models is the maximum between four kinds of working conditions,18 016 kN?m,31 163 kN?m respectively,and the value of the dock lock chamber is comparatively large,indicating that the presence of the keyway joints can effectively reduce the positive moment of the chamber bottom.This condition also has the maximum stress foundation.It is also found that under high water condition the two models have the maximum tensile stress on both sides of the top center of bottom,and have congenial value.The middle moment of the keyway lock chamber bottom is smaller than another model’s under this condition.

Abstract:This paper analyzes the composition,relationship and system configuration of lock logistics system based on the object-oriented modeling technology and system simulation method,establishes the object model and dynamic model of lock system to elaborate the universality of simulation module library for lock system,and builds the simulation module library of lock system.Building quickly the Three Gorges ship lock simulation module and carrying out simulation experiment,this paper verifies the engineering application value of the module library.

Abstract:Establishing a 1:30 physical scale model,we observe the filling & emptying system’s hydraulic characteristics and berthing conditions in chamber of Mengzhouba second-lane lock.The result proves the reasonability of adopting the overall layout form of sidewall long gallery & branch hole dispersion system in Mengzhouba second-lane lock,and the hydraulic characteristics under the recommended valve opening mode satisfy the requirements of the design and related codes.

Abstract:The flow level comparing method and the stable waterway depth estimating method were adopted in the fine reach to research the water depth that can be reached when this river is under the influence of factors such as flow,slope,and bed roughness.Furthermore,according to the planned ship type and the current situation of the ship type at the watershed of Xijiang river,the dimension standards for constructing a level-4 navigation channel was put forward,and the feasibility of constructing a level-4 channel at this reach was comprehensively analyzed.

Abstract:During the construction of dredging and hydraulic reclamation,how to reduce the water content of reclaimed soil rapidly is the key point when dealing with the soft foundation in reclaimed area.In order to further improve the drainage efficiency,the study on pulsating vacuum preloading drainage technology was carried out based on the silt rheology theory.By conducting a large number of small-scale single plate water draining model tests inside the room,this paper analyzed the drainage effect with the pulsating vacuum preloading method,and proposed a new method for soft foundation treatment.Experimental results show that this method is superior to the present vacuum preloading drainage method which is commonly used,and it improves the drainage efficiency and reduces the silting and blocking problems in drainage channel.

Abstract:In the process of excavating the foundation of gate dam in Yuliang navigation junction project,it is discovered that the shear weakness zone exists in the middle of rock stratum and the joint fissure is relatively developed;the integrity of rock mass is relatively bad.Meanwhile,the structural surfaces such as interlayer shear weakness zone,joint fissure surface and rock surface mutually cut each other and form into different size of blocks which are unfavorable to the anti-sliding stability of dam foundation.The deep-layer sliding doesn’t meet the standard requirements through calculation.After contrastive analysis and study on many schemes,the comprehensive foundation treatment scheme is adopted by combing with measures such as excavating partial weak interlayer,laying anchor pile layout and grouting the foundation for consolidation.

Abstract:Based on the theoretical knowledge and engineering practices about vacuum preloading at present,this paper analyzed the change features of parameters including pore water pressure,mud surface settlement,water yield,moisture content and strength of the hydraulic fill mud consolidated by vacuum preloading through test.The test results show that at the earlier stage of vacuum preloading,the surface settlement increases fast,but the pore water pressure increases slowly;in contrast,the surface settlement increases slowly and the pore water pressure increases fast at the later stage.The strength increasing mechanism of hydraulic fill mud consolidated by vacuum preloading was analyzed,and the strength increasing process of hydraulic fill mud was calculated by applying the calculation formula for the strength increase under effective stress consolidation,and combing with monitoring and testing data.The calculation results show that the strength increasing rule calculated with theory corresponds to the strength increasing rule practically measured in the experiment;the strength of hydraulic fill mud is nearly not existed at the earlier stage of vacuum preloading,but increases relatively fast in the middle and later stages of vacuum preloading;The strength increasing trend of soil mass still doesn’t tend to disappear after 7 months’ vacuum preloading.These characteristics about the strength increase of hydraulic fill mud consolidated by vacuum preloading should be brought to the attention in the design and construction of vacuum preloading engineering.The preloading period should be reasonably determined by comprehensively considering the strength increasing rule and the rationality of engineering economy,and the strength index shall be regarded as one of unloading standards.

Abstract:For the stability of the vertical revetment constructed on sand foundation,an island filling project in Haikou city is elected to research the application of compaction sand piles in the vertical revetment foundation anti-liquefaction.The calculations on the foundation liquefaction index indicate that it is necessary and feasible to pile compaction sand piles when constructing vertical revetment on sand foundation,and that compaction sand piles can increase the density of sand and eliminate sand liquefaction.Meanwhile,the results of field tests also prove that the sand foundation processed with compaction sand piles meets the anti-liquefaction requirements,and can guarantee the stability of the vertical revetment.

Abstract:For high-slope retaining structures buried in the shallow rock,based on the load structure method,the model was reasonably simplified according to the theory of elastic foundation beam.The anti-skid pile foundation will be optimized from the distributed structure to the double-row pile revetment structure,which can play fully the role of end-fixing of raw-pile in the rock section,reduce the pile internal force and deformation,and reduce the interference with neighboring buildings,so as to reduce the construction difficulty of the pile into the rock.

Abstract:Based on a dredged harbor basin project,this paper introduced the design and key construction technologies about the over-length steel tube-sheet pile wall in the integral deep-water unloading sheet-pile structure.According to the auxiliary pile’s ability to adapt to the deformation,the requirement that the allowable deviation of main pile’s verticality is no more than 0.4% was put forward.Through rational design and transformation to the guide frame,the pile-sinking technologies such as whole-pile lifting,vibrating-driving combination,and staggered sinking were adopted to ensure that the piles sink smoothly.The results show that all the steel tube-sheet pile walls achieve the design elevation and have a good pipe sinking effect.It can provide a technical reference for similar projects.

Abstract:In the 1～3 berth project at Kemen work zone in Fuzhou port,deep soft foundation exists at the revetment of flood discharge trench,but the surface layer is covered by so many block stones that it is difficult to implement soft foundation treatment to the substratum.Aiming at this problem,the scheme of adopting the method of combing guide hole with pipe sinking gravel pile was put forward for the soft foundation treatment.This scheme successfully solved the technical problem of dealing with the underlying soft layer by penetrating hard layer,and obtained a good effect.This designing scheme and construction method can provide a reference for the design and construction of similar projects.

Abstract:There are seven professional sand compaction pile ships in China,all of them are imported from abroad and expensive.It’s very meaningful to study the transformation of sand compaction pile ships,which is helpful to speed up off-shore port constuction.Based on the construction of the South Sea Pearl artificial island projects in Haikou bay,the construction technology,application conditions and quality control of sand compaction pile construction with land pile drivers are described.It’s good for master of the consolidation soft foundation with sand compaction pile ships.