Abstract:According to the wave conditions of Nanhui siltation engineering located in the Yangtze River estuary,this paper studies the wave characteristics of the section of hollow tetrahedron siltation embankment by physical model test.Test results show that:1) The porosity of embankment is about 66%,when the weight of each hollow tetrahedron is 3 t; 2) The reduction rate of wave energy increases linearly with the increase of embankment height,and the increasing rate of the reduction rate of wave height is averagely 4 times faster than that of wave length with the increase of embankment height;3) Compared with traditional siltation embankment which is composed of riprap and armor block,the hollow tetrahedron siltation embankment has many advantages such as significantly reducing the ground forces from the dike,simplifying construction and repair work,a strong ability to survive under strong storm action and reuse; 4) A critical stable cross-section shape of hollow tetrahedron siltation embankment under certain conditions is proposed.Under this shape condition,every 100 m of siltation embankment consists of about 3 210 blocks,the wave reduction effect of which is slightly worse than that of traditional siltation embankment at low water levels,while the effect is close to or even significantly better than that of the traditional one at high water levels.

Abstract:MIKE21 BW model is verified by the wave field simulation of single jetty flat terrain and an actual port terrain,which match well with calculating diagram in the specification or physical model test values.At the same time,studies show that as the limitation of numerical format,when the incident wave is oblique,there are evident errors in the model calculation result,and rotating the terrain to adjust the incident wave from oblique to vertical can improve the calculation results of the model.In addition,in the wave simulation at an actual port terrain,the influence of the higher peak factor γ to the wave field is also discussed.

Abstract:The crack width prediction is one of the most important contents in concrete structure design.This paper compares different international code provisions and analyzes the calculation conclusion based on the case studies.Combining with the current study on the crack with,some suggestions on current Chinese code are proposed,which could be useful for overseas projects.

Abstract:According to the actual measurement data and the Stokes wave theory,we study the effect of nonlinear wave loads on the offshore wind turbine foundation.When the wave characteristic parameters are determined,the velocity potential,velocity field and acceleration field function of the wave can be calculated,and the variation regularity can be analyzed.The wave characteristics of variable parameters and cycle wave loading extreme variables are predicted using BP neural network,and the probability density function of wave load extreme value distribution is fitted using Matlab.

Abstract:This paper studies the mooring force and movement of 275HP bow-stern double mooring trawler under the action of wind and wave,wave and current or wind and wave and current.The experimental results show that the mooring force and rolling angle under the action of wind and wave are both higher than that under the action of wave.When current velocity is less than 1.0 m/s,the mooring force under the action of wave and current is greater than that under the action of wave,while the rolling angle is slightly less.Bow-stern tension force under the combined action of wind,wave and current is greater than that with the effect of wind and wave or wave and current.Because of the difference of bow-stern area of fishing boat affected by wind and current,the influence of current on bow tension force is greater and the influence of wind on stern is greater.Considering the inhibitory effect of the initial rolling angle of fishing boat on its motion,the rolling angle under the combined action of wind,wave and current is slightly lower than the value under the action of wind and wave.According to the experiment,the allowable wave height of 0.6 m is suggested when there are about force 10 wind and current with the velocity less than 1 m/s at the same time in the port.

Abstract:This paper analyzes the ground penetrating radar(GPR)method in detection of cofferdam blasting toe-shooting effect based on a real example of Jinhai phase Ⅲ east cofferdam engineering in Lianyun new city,Jiangsu province.According to the explanation and analysis of the radar image,we can obtain the specific scope and depth of the cofferdam riprap.It provides the basis for evaluation of the blasting toe-shooting effect and the reference for the subsequent construction.It shows that GPR is an effective method in the detection of blasting crowded silting effect.

Abstract:The large cylinder breakwater is subjected to horizontal loadings,vertical loadings or the combination of those loadings generally.The type of the structure and the penetration depth can influence the bearing capability of large cylinders when subjected to the combination of horizontal and vertical loadings.The swipe loading model with displacement loading control method is adopted to calculate the bearing capability of large cylinders in different radios of penetration depth to its diameter.According to the results of numerical stimulation,the bearing capability in horizontal direction increases dramatically in a linear relationship.However,the bearing capability in vertical direction,though in the beginning,increases,then tends to become stable in the following situations.Furthermore,the plastic penetration area appears in the soil on both sides of the large cylinders when the penetration depth to the soil is in a lower level,while it changes to appear on one side of the large cylinders along with the increasing of the radio of penetration depth to the diameter.In the end,the failure envelope of large cylinders subjected to the combination of horizontal and vertical loadings turns out to be convex ellipse,the radius of which increases when the penetration depth getting larger.Besides,the normalized failure envelope can be expressed in the exponential form of V/Vult and H/Hult。

Abstract:The wave uplift force is an important external load in high-pile wharf and piles.Based on the analysis of the formula system for the wave uplift force,we find the relationship between the uplift force and the water stage and bottom elevation,and the position of biggest uplift force appears,so as provide convenient and quick calculation.Comparing existing calculation formulae,we discuss whether the influence under the hydrostatic pressure shall be considered for the total wave uplift force.

Abstract:For the rubble mound breakwater in deep water,the influence of the property of the core stone on the wave propagation is studied using regular waves in physical experiments.Without overtopping,the relations between the transmission coefficient of the rubble mound breakwater,the period and height of the incident wave,and the weight distribution of the core stone are discussed.An empirical formula of transmission coefficient in function of dimensionless parameters Hi/d,gT2/d and B/D50 are fitted,which provide reference for breakwater construction and scientific research.

Abstract:To ensure the country’s precious coastal resources can be fully utilized,it’s crucial in wharf design to determine the reasonable layout and grade of a wharf project.Serveral tidal current and sediment mathematical models are built to imitate the schemes of a wharf with different fornt-line positions and grades,study the change of current,erosion and siltation of dreging area,and get the siltation volume of basin and channel.Finally,the recommended plan is presented by calculating and considering the factors of economic benefit,port development,as well as influence on the surroundings.

Abstract:In order to study the application of HRBF500 high-strength rebar on reinforced concrete beams in port pngineering,we carry out an experiment of reinforced concrete beams with HRBF500 rebar as stirrups under concentrated load based on normative clauses of design code for concrete structures of port and waterway engineering.The propagation laws of diagonal crack and failure mode are observed under different external loads.The load values are collected under different stress state of the beams.Shear capacity and diagonal crack width during the limit state of serviceability considering influence coefficient of long-term loads are analyzed based on normative clauses of load code for harbour engineering.The results indicate that the propagation laws of diagonal crack of the beams with high-strength stirrups are basically the same to the ordinary beams and the strength of rebar can be fully utilized.The shear capacity and diagonal crack width considering the effect of long-term loads in the normal service stages can satisfy the requirement of design code for concrete structures of port and waterway engineering,which is safe enough.

Abstract:Permeable breakwater with barriers is applicable to the situation of deep water and poor foundation bearing capacity.By physical model experiment,we verify the rules between both parameters of the model and wave elements and the effect of wave dissipation of double barriers permeable breakwater,which mainly studies the transmission coefficient variation rule of transmission coefficient in the range of［0.25,1.5］.The wave dissipation effect of multi-layer-barriers permeable breakwater is obviously better than the single one,and an optimal engineering design can be given.Through the research on the calculation method of the wave transmission coefficient,we obtain a new structural form by modifying the Wiegel equation and Kriebel equation which fit the double-layer-barriers permeable breakwater,providing reference for the practical engineering calculation.

Abstract:The shoreline utilization intensity,the index which can be used to evaluate the shoreline utilization efficiency of excavated-in layout and alongshore layout，is introduced to evaluate and compare the existing excavated-in layout and the alongshore layout.Introducing the restricting factors of the index,i.e.land width and land supporting area to realize the quantitative analysis of the shoreline utilization efficiency of the excavated-in layout.Then the evaluation index is applied to the engineering project,through which,the reasonable numerical scope of shoreline utilization intensity is obtained.

Abstract:This paper compares and analyzes the differences of codes for vessel berthing energy design of harbor between China and Britain,and verifies the result by an engineering example.The study shows that the results calculated by Chinese codes are less than those calculated by British codes.Some influential factors of berthing energy are ignored in Chinese codes.Suggestion about amending some parameters in calculation in Chinese codes is proposed.Meanwhile,this paper may serve as reference for the vessel berthing energy design for harbors abroad.

Abstract:The wave transmission coefficient through double immersed vertical barriers with holes of high-piled wharf is studied through the physical model experiment in wave flume under irregular wave action.By comparison of experimental results with different theoretical calculation methods of wave transmission coefficients,the calculation method of wave transmission coefficient in the Code of Design and Construction of Breakwaters turns out to be not suitable for high-piled wharf with double immersed vertical barriers with holes.The results of Kriebel formula are in good agreement with experimental results.On the basis of Kriebel formula,the paper proposes a semi-empirical formula of wave transmission coefficient under certain wave conditions,which may serve as a reference for the engineering practice under similar conditions.

Abstract:Accompanying the large-scale trend of wharf and enlargement of handling machinery,the effect of horizontal force of hoisting machinery on the lateral bent becomes more apparent.Based on the plane calculation under the effect of horizontal force of lateral bent and beam size of the crane,this paper introduces the calculation method of high piled beam slab,and gives a suggestion on the simplified calculation of the horizontal force on the lateral bent of handling machinery.

Abstract:Combining the design of automobile ro-ro & general cargo wharf in Meishan bonded port area and based on a comprehensive analysis on the natural conditions of the engineering area,operation requirement of automobile ro-ro terminal and general cargo wharf,rationality of structural design,feasibility of construction,as well as the engineering cost,etc.we determine the elevation of wharf apron,which may serve as reference for similar engineering designs.

Abstract:This paper discusses the advantages of the wharf construction in the EPC mode.Combining with a bulk cargo dock in Suzhou in EPC mode,this paper optimizes the pile arrangement of high-pile wharf by increasing the pile caps to set lengthways vertical piles,increasing pile slope to reduce the amount of raked piles,setting the angle and position of lengthways oblique piles flexibly,etc.The optimized layout of pile foundation not only makes the construction easier,but also improves the piling efficiency and saves the engineering investment.

Abstract:This paper expounds the idea and scheme of renovation for the technological process system of Ningbo Guangming general berths upgrading renovation engineering.Under the premise of not influencing the existing production,we adjust the technological process and update the handling equipment to match the berthing grade and design ship type and ensure more reasonable technological process.By the innovation,the port through capacity is greatly improved,and the yard capacity matchs well.

Abstract:There are three main navigation hindering areas in Jiulongtan shoal reaches of the Yangtze River,which are Guguqi,Jiaobatan and Sanjiaoqi.On the basis of navigation hindering cause analysis and combining the target and principle of waterway regulation,we propose the regulation schemes.The 2-D flow and sediment mathematical model is applied to investigate the regulation effects of different schemes.According to the flow conditions and sediment erosion and deposition characteristics of the typical year,we compare and optimize the waterway regulation schemes,and then propose the recommended one.Using the flow and sediment series data of year 2002 to 2011,we study the laws of long-term channel sedimentation,the results of which show that after implementation of the recommended scheme,the channel scale meets the design requirements and can remain stable,which indicates that the regulation effect is remarkable and has achieved the expected goal.

Abstract:Specification algorithm applied in calculating the lock head does not consider the impact of nonlinear foundation material and 3-D structure’s integrity to the structural calculation of the lock head,so it can’t simulate the real stress and deformation of the whole lock head and foundation,thus affect the structural design of lock heads.To counter the above problems,we establish a 3-D finite element model of the lock head-foundation by taking a large ship’s lock heads for example.Considering the foundation’s material nonlinearity，the foundation material model uses the Duncan-Chang’s E-B model.The large scale finite element analysis software ABAQUS is used to analyze the stress distribution and deformation characteristics under working conditions of the lock head.The results show that the canonical algorithm is generally conservative,but it is unsafe at the side pier’s cross-section near the gate and the edge of the pier and the bottom.

Abstract:Dafeng approach channel is a natural depth waterway which locates in Xiyang channel of the radial sand ridges area along north Jiangsu province.In order to provide a scientific basis for the construction of Dafeng 150 000 DWT approach channel,we carried out the trial excavation from 2012 to 2013.The dredging thickness is 3.1 m and the total siltation thickness is 1.72 m in 12.5 months.The back silting intensity during the stable period is 0.12 m per month and the influence of a normal year wind is limited.The research provides reference to Dafeng approach dredging and related waterway construction.

Abstract:A shallow water flow model is parallelized with OpenMP and OpenACC to improve the computational efficiency.The Fujiangsha reach is used to validate the validity of the present model.Results of the numerical simulation indicate that the calculated results are in good agreement with the measured ones and there’s no obvious differences compared with the results of sequential program.The two modes of parallel processing can reduce largely the calculating time without losing accuracy.Moreover,the speed-up ratio of GPU parallel program reaches more than 6.7 times.

Abstract:Based on the chart of year 1972 to 2007 and hydrological data of mouth bar around the Karsimu port Ahsan channel,we probe into the mouth bar evolution characteristics and its influence on Ahsan channel.The results show that the Ahsan channel and mouth bar are relatively stable in the 1970 s,but in the 1990 s,with the increase of the human factors,and under the influence of natural conditions,the Ahsan channel axis changed.Recently,the scour rate around channel increased,the water around waterway became shallow,deposition turned more serious and the channel maintenance work increased.

Abstract:The navigation-power junction artificial regulation will cause the change of water level and velocity in the downstream channel,and affect the the condition of navigation.Based on the the typical mountainous waterway,Lanjiang under the navigation-power junction regulation,a numerical model is established to study the hydraulic characteristics of water level and velocity change under different return periods after the completion of Yaojia hub and Lingma hub,and the designed highest navigable water level is obtained from the simulation.The results show that:The characteristic water level under the flood of once 10 years and once 5 years is much bigger than the warning water level,and the velocity of partial area is large under the case of the flood of once 3 years;These go against the safety of navigation;Combining the construction of waterway and economic benefits and the safety of running,and according to the control velocity obtained by the synthetic duration curve method,the water level under the case of 90% flood frequency should be considered as the designed highest navigable water level.

Abstract:Based on the annual survey data,this paper analyzes the dydro-dynamic condition and bed evolution process,and researches the river regime of Anqing reach.The characteristics of river bed evolution are as follows:the flood river regime is stable;the Xinhekou point bar is basically stable with slight deposition and erosion;the process of new middle channel is closely related to Xinhekou point bar,Emei sandbar and Qian sandbar.Combining with the implementation of waterway regulation,the fluvial tendency of Anqing reach is predicted.

Abstract:Based on a comprehensive consideration of destination selection,the ship lock construction scheme,construction of water conservancy facilities,and the scheme of water resources, we put forward the general design scheme of Xinwanfuhe channel,the implementation of which has important guiding significance to the development of Shandong inland feeder channel.

Abstract:The application of double-pile in foreshore soft foundation is studied.Based on the elastic link finite element theory,the finite element software ANSYS is used to simulate the mechanical characteristics of double-pile under different conditions,and the influence on the displacements and internal forces of the double-pile stiffness and penetration depth.Results show that the double-pile is pretty well applied to the foreshore soft foundation.The penetration has great impact on the stability of structure.The increasing of the stiffness can reduce the horizontal displacement to some extent,but when the pile diameter reaches a certain critical threshold,double-pile appears rigid body motion which is not fit for the bearing capacity of soft foundation.

Abstract:It is proved that the improvement effects cannot meet the use requirements for conventional vacuum preloading techniques improving new hydraulic reclamation mud foundation.To investigate the reasons,we analyze firstly the engineering properties of new hydraulic reclamation mud,and then carry out a full-scare single-well indoor model experiment considering different initial moisture contents.It is shown that:(1)the new hydraulic reclamation mud mainly consists of fine and very fine soil particles with high content of clay soil particles(clay & rubber) and strong hydrophilic minerals (illite & smectite);its pores mainly consist of isolated pores and intergranular pores;its moisture content is usually larger than 100% and more than 1.5 times greater than the liquid limit;its void ratio is larger than 2.5;its plasticity index is larger than 20;its liquid index is larger than 2.0.(2)when it is improved by no-sand vacumm preloading for new hydraulic reclamation mud,the vacuum degree loss can be up to 20% under the membrane,and the radial loss extent of vacuum degree is severe from vertical drains to soils;the radial range of vacuum degree is limited to the soil column with the diameter of around 40 cm;the unconfined compressive strength does not exceed 35 kPa in the range of soil column;it is small for the effective improvement depth and intensity of the soil strength growth.The above two reasons both result in the unsatisfied improvement effects.Therefore,it is very necessary to optimize the conventional vacuum preloading techniques or develop a new improvement technology for new hydraulic reclamation mud.

Abstract:Designing the comparative model experiment,we study the treatment effect of high and low liquid limit clay with vacuum preloading method,esp.the applicability of vacuum preloading method to treat high liquid limit clay in a project and the treatment effect for the two kinds of clay (high and low liquid limit) samples with this method.The result indicates that the moisture content and void ratio of clay samples decreased obviously;The density and strength of them also improved obviously;The volume compression ratio of high liquid limit clay is 47.4%,and the volume compression ratio of low liquid limit clay is 22.9%.It is applicative to treat high liquid limit clay with vacuum preloading method in this project,and the treatment effect is obviously.

Abstract:Taking a large oil tank foundation project of Yangzi petrochemical company for example,we conduct an experimental study on dynamic consolidation of the filled fly ash underlying silty soft soil.At first,the surface settlement around craters and pore water pressure are inspected,and then the improving effects are detected through laboratory soil mechanics test,load plate test,standard penetration test,cone penetration test,etc.The test shows that it is obvious to improve the foundation with construction technology of low energy in the beginning and gradually growing energy and cycles combined with gravel cushion,vertical plastic drainage board and the layout of cinquefoil for tamping point.The mechanical property and anti-deformation characteristics are improved obviously and the liquefaction problem of the upper fly ash is eliminated.The whole consolidation effect is remarkable, and physical-mechanical properties are better than the expected.At the same time,the optimal parameters and construction techniques are obtained by analyzing the measuring data.

Abstract:Taking Weifang fishing wharf project as a study case,we analyze the difficult points of the small-spacing & large-diameter piling structure construction,summarize the control points of the construction quality on piled wharf,and expound the key technology for seepage control,to serve as reference for similar projects.

Abstract:The steel concrete composite pile combines the low cost of concrete pipe pile and good flexibility of steel pipe pile,and achieves the purpose of reducing the cost under the premise of meeting the project quality requirement.The design method of lifting steel concrete composite pile with six lift points is derived and compared with field test,based on which,the parameter sensitivity of lifting pile is discussed.Meanwhile,this paper analyzes the similarities and differences between six and four lift points based on field test.The study may serve as reference for the lifting technology of the steel concrete composite pile.

Abstract:The large-diameter prestressed concrete pile,which is of large strength and great bearing capacity,is usually used in pile foundation structure in coastal and marine engineering.But the pile head is often damaged during pile sinking.This paper describes the reasons and countermeasures for the damage of pile head during sinking of the large pipe pile.

Abstract:The impoundment of the Three Gorges reservoir changed the rapids’ sedimentation rules within the fluctuating backwater area.To guarantee the safe and smooth operation of the tail of the reservoir channel and Chongqing port,maintenance dredging is needed every year.This paper summarizes the situation of maintenance dredging at the Three Gorges reservoir fluctuating backwater area,analyzes the problems and experience during implementation of the dredging engineering,and gives suggestions to the dredging time and sequence,to serve as reference for the future dredging engineering.

Abstract:There are many cases of sand throwing on seawall in reclamation projects,and the safety and stability of seawall under construction directly relates to the construction control level.But up to present,there is no research on the safety control method of sand throwing yet,and the construction mostly relies on the experience,thus the construction faces great safety risks during implementation. Combining with the actual need of Shantou east coast park,we propose a complete set of safety control method for sand throwing on the seawall under construction from the seawall stability computation,construction safety monitoring technology and construction organizational measures,which achieved good effects in the engineering application,and guaranteed the seawalls’ safety.