Abstract:For the impact of landing typhoon on the estuarine entrance of the Yangtze River,we analyze a sequence of fixed-point observed data systematically based on statistical method,which is collected during the three landing typhoons.The results show that after typhoon landing,the significant wave period decreases to normal,and no long-period surge occurs.The water level raises before the typhoon landing,and the maximum surge and greatest significant wave height both occur at the high tide moment before landing.When the significant wave height is above 2 m before the typhoon landing,the waves act as a disincentive to the lateral flow component at the entrance.Other time,the changing process of lateral flow component matches with spring tide well.

Abstract:Based on the characteristics of water jet technology,such as environmental protection,easy access to materials and strong cutting ability,we propose a method of using water jet to cut reefs.By establishing a two-dimensional plane mathematical model,we simulate and calculate the motion characteristics of high-pressure water jet under submerged condition.The results show that the initial section of the jet is the region where the jet impingement velocity is the largest,the dynamic pressure is the largest and the energy is the most concentrated.The submerged water depth is from 0 m to 30 m,with the increase of water depth confining pressure,the initial stage velocity attenuation is less than 5 m/s,and the attenuation degree is only about 1.5%.In the submerged environment of 0 m/s to 5 m/s,the impact of water flow on the initial stage of the jet is relatively small.The variation of horizontal velocity component in the initial stage of the jet is only within 8.5 m/s,and there is no obvious deviation,so it still has a good impacting flow pattern.

Abstract:Appropriate wave generation methods,wave equations and mesh size should be provided as setting up an exact numerical wave tank.Based on FLUENT model,we adopt three wave generation methods,including the source term method,pushing plate method，boundary velocity method to set up numerical tanks for wave simulation of different mesh size and different wave steepness.Combining with the corresponding wave theory,we comparing the effects of numerical first-order linear wave,second-order Stokes wave and third-order Stokes wave by three wave generation methods,and obtain the characteristics of numerical wave propagation,the appropriate grid scale and the influence of wave steepness on the numerical wave effect.The results show that the numerical wave height using the source term method attenuates relative sharply,it is the most sensitive to the change of mesh size.The simulation results using the push plate method is the most exact.The computation efficiency for the velocity boundary wave making method is the highest.The wave height attenuation speed is the slowest.The wave propagation in the numerical flume has the nonlinear effect.The nonlinear the influence during transportation can be observed,and it causes the nonlinear deformation of the wave surface even if the making wave is linear.

Abstract:HDPE is used as firefighting pipeline in storage yard of a hydraulic project in Tanzania.HDPE is a kind of low modulus viscoelastic pipe,so it will have self limiting creep expansion under pressure.Due to the extension of polyethylene molecular chain under high stress,the pressure of filling water in the pipe will slightly decline during the test time,which does not mean that the pipe leaks,but the normal behavior of creep plastic pipe.Compared with the rigid pipe,the test method of HDPE pressure test will be different.Based on Chinese code GB 50268-2008,European code BS EN 805:2000 and American code ASTM F2164-18,the firefighting pressure test of HDPE pipeline is compared and analyzed to provide experience reference for subsequent related projects.

Abstract:Highway transportation is one of the main methods of port collecting and distributing transportation. This paper analyzes the current situation of the congestion of main collecting and distributing roads near the port caused by the large throughput of large container ports,and summarizes the traffic characteristics and congestion reasons of the roads near the port.On this basis,two measures are put forward for both reducing the hourly traffic flow and increasing the capacity of collecting and distributing road,i.e.,reducing expenditure by setting up outside yard to balance the traffic flow and increasing the income by introducing the driverless container truck to reduce the mean time headway. Furthermore,applying the measures proposed to Shanghai Yangshan Deep-water Port,this paper describes the scale and location of the off-port transit storage yard,and adjustment scheme of lane layout under the requirement of driverless container truck transportation.The result confirms the feasibility of the measures proposed in this paper. In consequence,it can provide an idea for the decision of port collecting and distributing transportation planning.

Abstract:Comparing with the traditional mooring line,the automated mooring system is faster in mooring and departure operation and safer and more reliable.At present,there are many engineering examples of automatic mooring system in foreign countries,but the main specifications of port engineering in the world have not been incorporated into the specific design methods of automatic mooring system.Currently,the calculation of the automatic mooring system generally needs to be carried out through more complex numerical simulation,which is not conducive to the design of the early stage of the project.In view of this situation,the paper analyzes the mechanical characteristics of the automatic mooring system,and assumes the mechanical model according to its mechanical characteristics.Combined with the current international and domestic codes about the calculation method of ship external force,the simplified calculation method of the automatic mooring system is derived.This method can be used for designers to calculate the forces on the automatic mooring system in the early stage of the project.

Abstract:In the process of drawing up overall port planning,the prediction of port throughput is very important to put forward the planning scheme.Support vector machine (SVM) method is a common and effective prediction method for port throughput prediction.In view of the complexity of the influencing factors of the port throughput prediction,this paper takes the overall planning of Jingzhou Port as an example to study and analyze the main index factors affecting the port throughput.Based on SVM prediction method,GA and GS method are used to optimize and improve the main parameters of SVM model,and the results of the GA-SVM and GS-SVM model predictions are tested by the MSE and R2.The improved SVM model is a new port throughput prediction method based on the current research results,which can be applied in the overall port planning .

Abstract:The calculation of the wave uplift force is very important for the design of the high-pile wharf structure,but the calculation methods are different based on different codes.International standards such as European and American standards are generally recognized internationally,or local standards are adopted. In order for better promoting the Chinese codes in international projects,comparative analysis of several codes is usually required.According to the Chinese industry code and manuals,combined with specific engineering examples,this paper compares the British standards,US standards,Japanese standards,ISO standards,PIANC standards and other commonly used foreign specifications.Furthermore,combined with several different wave period conditions commonly used in engineering,we analysed the relationship between the total wave uplift force and the ratio of the height of the bottom of the structure above the static water surface to the design wave height;for the condition of medium water depth and deep water depth,we analysed the differences and characteristics of wave uplift force in different periods of different water depths base on different calculation method,and gives suggestions for the application of overseas.

Abstract:Aiming at the problem that it is difficult to accurately set the reserved settlement on the top of the wave retaining wall when the revetment on soft soil foundation is completed,we take the revetment of Xiaohudao petrochemical wharf phase I project as the research object,and use the hyperbolic method and the three-point method to calculate the post-construction settlement based on several months’ settlement observation data of typical revetment sections.The results show that the three-point method is affected by various factors such as irregular loading and variation of groundwater level,and the measured settlement curve is often not smooth enough,which leads to difficult selection of points,difficult control of errors and abnormal calculation results.The hyperbolic method is relatively simple,and the data processing is simple,which is easy to be applied and promoted on site.It is more reasonable and reliable that using the calculation results by the hyperbolic method and the theoretical calculations to set the reserved settlement of the wave retaining wall.

Abstract:To guarantee the berthing conditions,mitigate the impact of engineering on the surrounding shoreline,and reasonably reduce the engineering investment,we study the layout of breakwater in Lufeng marine base wharf project. Based on wave and tidal current observation data and historical data of remote sensing images,and carrying out the numerical simulation of wave,tidal current,sediment and beach evolution,we analyze the hydrological characteristics of Lufeng marine based,clarify the berthing stability conditions,wave loads,flow field changes,sediment movement and shore evolution characteristics under different breakwater layout schemes,and discuss the advantages and disadvantages of them.According to the comparative analysis,and considering the convenience of reserving more expansion space and phased construction,we suggest to adopt the northeast opening scheme and do not extend the breakwater currntly,and supplement the affected bank with corresponding beach regulation measures.

Abstract:Seismic design methods in US standards for pile-supported wharf are compared from their principle and adaptability.The displacement-based approach and its substitute structure method are focused on.Effects such as bi-linear approximation of pushover curve,damping ratio,and response spectrum attenuation are reviewed for the substitute structure method.Through pushover analysis and substitute structure method,the deformation capacity and seismic displacement are calculated,and the seismic performance of wharf is rechecked.Combined with practical cases,response spectrum analysis and substitute structure method are used to analyze the seismic behavior of a pile-supported wharf structure.The results show that the response spectrum method tends to be conservative and cannot reflect the load attenuation at plastic stage,and the substitute structure method is more precise.For the substitute structure method,different effective damping ratios will significantly affect the displacement calculation.

Abstract:The Lujiahe waterway is characterized by navigation obstruction with steep gradient,rapid flow,shallow water and width problems,especially the falling ridge in the middle section of Shahong channel has plagued the river regulation for a long time.This paper probes into the formation reasons of the falling barrier and its effect on channel and carries out exploratory regulation.The results show that the formation reasons of the falling barrier include the geomorphological and geological factors,and the influence of the Three Gorges reservoir’s impoundment;the falling barrier aggravated steep slope and rapid flow phenomenon and channel obstruction.After the implementation of dredging,the channel depth in the shallow area is ensured,and the large ratio drop in the falling barrier area is significantly reduced.

Abstract:Typical landslide parameters in Three Gorges Reservoir were collected.Taking the topographic data of the Wanzhou section of the Yangtze River,the three-dimensional physical model of impulse waves was built on the basis of similarity criterion.According to the situation of navigation,the ships were divided into three types:the navigation ships,moored ships and anchored ships.The navigation safety thresholds of three type ships exposed under impulse waves induced by landslides were studied.The results indicated that the channel as a suffered body due to impulse waves disaster was partitioned into three subareas：the straight area within the width of landslide(region A),the straight area outside the width of landslide(region B),and the meandering area(region C);for region A,the detailed threshold did not exist,all ships were prevented from entering this area when meeting a landslide forewarning or landslide;for region B and C,these ships should be keep outside the safe distance thresholds.

Abstract:At present,the design specification does not clearly define the basis for selecting the Z-value of the front and rear water pressure difference in the formula for calculating the opening and closing force of the miter gate.The designer selects a large value when calculating the opening and closing force of the miter gate,so it leads to engineering waste.We carry out the numerical simulation and physical model test of the hydrodynamics and opening and closing characteristics of the miter gate of Datengxia ship lock,and analyze the effect of the factors affecting the opening and closing force quantitatively in order to select the Z-value more scientifically and reasonably.The results show that increasing the clearance of the door bottom,the depth of the sill and the use of the variable speed opening and closing mode are beneficial to the smooth flow of water before and after the gate.The Z-value during the opening and closing process is small,and the corresponding opening and closing force of the herringbone door is also small.Considering the main influencing factors of hydrodynamic characteristics of the opening and closing of the miter gate,the Z-value can be reasonably selected to obtain more accurate calculation results and optimize the capacity of the hoist.

Abstract:Under the strategic superposition condition of “the Belt and Road”,“the Huaihe River Ecological Economic Belt”and“the Yangtze River Delta Integration”,aiming at the problems of inadequate development of high-level waterway of Jiangsu,Anhui and Henan provinces and no regional network,the layout of the existing waterway network in each province is analyzed,the way,important node and logistics hub network of foresight waterway connecting the Yangtze River and seas are put forward,and that the channel network is a strong support for the national strategy to extend to the west and boost the regional economy is pointed out.The high-level waterway network provides a reference for the region to give full play to its strategic advantages and implement the strategy jointly.

Abstract:Aiming at the installation deformation of the top seal of reversed tainter valve for high-head ship lock,we apply the method of water stop slice test combining with numerical simulation,and study installation deformation properties of semicircular head top seal,such as the deformation profile,displacement deformation,bulge height and contact width of head,and the distribution law of equivalent stress under different installation loads.The results show that based on prototype material parameters obtained by the mechanical test and theory of contact mechanics calculation,the results of seal deformations obtained by numerical simulation are in good agreement with the results of the scale 1:1 slice test.With the increase of installation torque,the bulge height of the semi-circular head increases approximately linearly,the contact width at the parapet shows a non-linear trend,and the maximum equivalent stress gradient appears at the boundary of seal head contacting with clamp plate and seat plate,which is the most easily damaged part of top seal.

Abstract:In order to study the temperature variation law of hydration heat of mass concrete and its influence on temperature cracks,we carry out a finite element simulation analysis and monitoring of buried thermometers for the ship lock under construction. By comparing the results of finite element calculation and measured temperature,we get the possible reasons for the difference between them. By setting the parameters of heat release function and strength adjustment function,the calculated results are closer to the actual engineering situation.Based on the results of finite element analysis,the possibility of temperature cracks in the main structure of ship lock is evaluated by the crack index. After adjusting the heat release function and strength adjustment function,it is known by calculation that the possibility of cracks in the main structure is less than 5%,which is consistent with the appearance of the main structure.We also discuss the similarities and differences of various codes for calculating the temperature stress to provide reference for selecting applicable codes and interoperability for relevant calculation.

Abstract:In order to scientifically evaluate the effects of the implementation of the water channel improvement project for the Yandao waterway from Chibi to Panjiawan in the middle reaches of the Yangtze River,this paper comprehensively analyzes the variation in four aspects including the change in scour and fill,the diversion ratio of the canal,the conditions of the waterway,and the stabilization of the buildings since the implementation of the project.The analysis results show that the implementation of the project has stabilized the pattern of the continental beach and river potential of the Yanziwo waterway,curbed the trend of unfavorable changes in the fairway,and further stabilized the position of the left channel as the main channel. The waterway scale has reached the designed standard.The research result lays a foundation for further improving the channel scale of the Yanziwo waterway and accumulates experience for the management of similar branching river reaches.

Abstract:Aiming at the problem of surface cracks generated in the upper part of the support beam during construction of a ship lock chamber,we analyze the causes and distribution of surface cracks of the chamber based on the finite element principle,and put forward the temperature control measures.The results show that the early surface cracks in the upper part of the support beam are mainly due to the internal-external temperature difference and the restriction effect of the support beam on the newly cast concrete;under the prerequisite of controlling the concrete casting temperature,we combine the surface heat preservation and internal water pipe cooling to control the temperature difference and the crack prevention coefficient of surface points is raised to 1.40.Applying the measure in subsequent construction,no surface cracks appear,which prove a satisfactory anti-cracking effect.

Abstract:In view of the problems existing in the design and construction of a gravity block wharf in North China,such as component collision,low accuracy of engineering calculation and low efficiency of technical handover,we carry out a research on the application of BIM technology in the design and construction of gravity block wharf. By creating a three-dimensional information model for collision inspection,engineering calculation,schedule simulation and visualization of process technology,we solve the above problems and come to the relevant conclusions as follows:visualization of BIM technology reduces communication costs and provides technical means for fine management of engineering;BIM technology can be used to solve the collision problems in the design stage to reduce the risk of rework during construction;the engineering calculation based on BIM model is more intuitive,complete,fast and accurate;using BIM technology to visually preview the construction schedule,the construction technician can be assisted to optimize the construction plan.

Abstract:It is different to accurately grasp the status and position of coal running on belt conveyor in the process of loading and unloading operation in coal port,which causes low efficiency,high safety risk and inaccurate sprinkler and dust removal.Based on the analysis of the characteristics of coal loading operation process and transportation equipment in Huanghua Port,this paper proposes a material flow tracking system for belt conveyor.By installing corresponding material flow detection devices along the process line,adding remote stations in the transfer rooms,designing PLC control algorithm to process the collected data,the system displays the results on the man-machine interface of shiploader operation in real time.The results show that the system can accurately detect the distribution position of material flow on the conveyor belt.The error between the system and the real distribution position of material flow is less than 20 m,and the detection accuracy is 99%.It effectively improves the efficiency of loading and unloading process,reduces coal spilling at the belt junction,and ensures the safety of semi-automatic and automatic loading process.

Abstract:PHC pipe pile is widely used in water transportation projects of China,but the calculation method of shear bearing capacity is not clearly unified,so we carry out the shear test on three PHC800B110-5 pipe piles with diameter of 800 mm and wall thickness of 110 mm.Based on the observation of the crack development,deflection and failure state,we analyze the maximum principal stress,the maximum shear stress and the principal stress angle at the shear span;based on the study on the shear failure process of the test pile,we obtain the shear cracking resistance and shear ultimate resistance of the test piles.The test results show that PHC pipe piles still have load carrying capacity after cracking until they are destroyed.

Abstract:Most of the existing calculation methods about the earth pressure between double-row piles are depending on classical earth pressure formula,without considering the influence of friction between pile and soil.In view of the above problems,according to the ultimate balance theory,the calculation method is presented with considering the influence of friction between the soil and the pile and the width between piles to calculate earth pressure between double-row piles,and it is expanded to make it applicable to the cohesive soil,the non cohesive soil,the incompressible foundation and the compressible foundation.With the increase of width between piles,the earth pressure calculated by this method presents a curve distribution,the asymptote is close to the vertical line,and the value of earth pressure is close to the Rankine formula.Compared with the results of the finite element software Plaxis,the calculated results of the earth pressure have the same tendency,and the calculated values of the earth pressure are basically the same,which proves that the calculation method is basically reasonable and reliable,and the results are reliable.

Abstract:A range parameter η exists in the formula for calculating the equivalent rigid joint depth in the design specification,and its different value will lead to the difference of calculation results by several meters,which greatly affects the calculation of superstructure.We apply the finite element analysis to calculate the horizontal displacement of the top of a single pile for the PHC pile,steel pipe pile and cast-in-place pile,which are commonly used in engineering.According to the basic assumptions of material mechanics,we constrain the cantilever beam deflection curve equation with beam end freedom and beam end rotation,and obtain a series of equivalent rigid joint depths of various pile types.Combined with the formula of design specification,we get the η value recommendation and matters needing attention for the equivalent rigid joint depth calculation.The research results can provide references for the calculation of pile foundation structure.

Abstract:At present,the consolidation degree and strength of composite drainage foundation cannot be calculated and predicted from theory,which causes inconvenience to engineering design and construction.Aiming at this problem,we rationally simplify the boundary conditions of composite foundation,deduce the theoretical model of composite drainage,analyze this problem by the finite element software of PLAXIS 3D,contrast the results of PLAXIS 3D with theoretical,and give the irregular correction coefficient of drainage control area a recommended value.The results show that the theoretical model results are consistent with the numerical simulation results.For the irregular correction coefficient of drainage control area,the recommended value of a is 1.20 to 1.35 when the distance between sand piles is more than 3 m,and is 1.35 to 1.50 when the distance between sand piles is less than 3 m.

Abstract:In the construction of CSD transporting medium-coarse sand,it is difficult to determine the optimum construction parameters of transportation and the rotation speed of dredge pump unit.Aiming at the problem that the calculation accuracy of hydraulic transportation of non-uniform medium-coarse sand is insufficient by common calculation formulas at present,the calculation formula should be fitted-revised by actual construction parameters to realize the accurate calculation of construction parameters of slurry transportation.At the same time,by calculating and analyzing the operation power of the dredge pump unit,the low-power rotation speed of the dredge pump under the most economical transportation parameters can be determined.The characteristic of rotation speed is,under the given mud flow rate,concentration and total lift of mud pump unit,that the underwater pump adopts low speed and deck pump adopts high speed,which is conducive to reducing energy consumption in transportation construction.

Abstract:In view of the difficulty of accurate real-time survey of the coastal long-distance tide level during construction,we study the principle of real-time tide level observation during construction and the dynamic change of trailing suction vessel’s draft based on the dredging project of Lianyungang Port 300,000 DWT channel phase II project,and propose a method of surveying the coastal long-distance tide level based on the technology of satellite difference and verify it in dredging projects. This method meets the requirements of the current specification for port and waterway engineering survey and the accuracy requirement of the construction water level as well. Moreover,it is applicable to any sea area in the world,and it is worthy of popularizing in the real-time tide level measurement in coastal long-distance construction.

Abstract:In view of the difficulty in controlling the traverse speed range of the cutter suction dredger during the construction process,this paper takes the dredging construction work in Panjin channel as an example,applies the analysis method based on the control chart to study the traverse parameters of the cutter suction dredger.This paper proposes the method of setting parameter range of traversing dredging operation based on the control chart,sets the cutter pressure and the suction vacuum of the underwater pump during the horizontal dredging operation in detail,and realizes the continuous quality control of the traverse operation during dredging.The results show that the method can provide a scientific and intuitive way to help operators to control the optimal parameter range so as to improve the ship’s productivity.

Abstract:Base on a project of ship lock in Zhoushan,the structure type of the lock head suitable for over-water construction is analyzed,the corresponding construction technology and water stop measures are put forward,and the foundation treatment method and anti-seepage measures are introduced.Different from integral docking structure of lock head under dry construction condition,the lock head adopts the structure type of combination of prefabricated reinforced concrete caisson and cast-in-site concrete.The caisson is used as the cofferdam.After the caisson is put in place,through the arrangement of temporary and permanent water stops,the caissons of lock head and lock chamber are combined into the overall structure to form dry construction condition.For the rock foundation,the combination of blasting reef and underwater prepacked aggregate concrete is adopted to ensure the stability of the caisson at high tide level.For over-water construction ship lock,the head structure and construction method saves the project cost and shortens the construction period,which is used for reference in design and construction of similar ship lock projects.

Abstract:In view of the structural stability and quality control requirements during construction of sheet pile wharf,we discuss the dredging and reclamation method in Hadarom Port project of Israel,find out the dredging and reclamation quality control points,and propose corresponding quality control measures to avoid main quality problems:position deviation of sheet pile,accumulation of silt in reclamation area,over dredging and shallow points in berth area.To counter the specific problems,we implement adaptive improvements:the trailing suction hopper dredger’s pumping sand on shore directly instead of loading sand in hopper and adjusting the high pressure flushing to side jetting,we can solve the problems encountered in dredging by the TSHD in shallow areas with water depths less than its load draught and dredging the areas adjacent to the sheet pile without mobilizing other equipment, and it is effective to save the engineering cost.