Abstract:

Abstract:This paper proposes the main technical problems in the first-stage project of 12.5 m deep-water channel of the Yangtze River below Nanjing city, such as water and sediment movement characteristics and navigation-obstructing characteristics, channel regulation and the timing of key parts, waterway regulation scheme optimization, and waterway’s new regulation structures, and analyzes the solutions to these problems and achievements, which are helpful for the acknowledgement of the construction and understanding of tidal river waterway regulation technology.

Abstract:The latest version of the third generation spectral wave model, WAMC4, is adopted for the long-term hindcasting of wave climate for the East China Sea. The model is driven by the NCEP reanalysis wind data spanning the period of 1950—2009. A 2-level nested downscaling framework, covering the Northwest Pacific Ocean and the East China Sea is established to simulate both wind and swell waves. The model result is validated against field data at Lianyungang and Lengjiasha. Based on the long-term modelling results, the temporal and spatial wave distributions of the area are obtained. The results suggest that the mean significant wave height decreases significantly from south to north, and its contours are consistent with the coastline. For the seasonal wave distribution, the mean significant wave height is the largest during winter and smallest during spring and summer. Furthermore, by comparing the significant wave field of 5% cumulative probability with mean significant wave field, the quantitative relationship between the two is obtained for different sea areas.

Abstract:The rich coal resources in China’s energy consumption determines the long-term dominant position of coal; The reverse distribution of coal resources and economic development degree leads to the transportation pattern of “West-to-East & North-to-South Coal Transport”; The formation,development and growth of industrial belts along the river and serious problem concerning environment and energy decide that the river transport will play a more and more important role. Based on the analysis of the characteristics and pattern of coal resource and endowment away in China, this paper proposes the coal transport pattern that East Inner Mongolia, Guizhou coal shall not be cross-area transported, energy golden triangle coal shall mainly keep “rail-ocean intermodal transport”, Xinjiang coal shall supply mainly central China area, to construct the coal transport pattern taking the Yangtze River trunk line as the frame and tributaries as the network, and realize a pattern of “North Loading and South Unloading”.

Abstract:The wave overtopping forces relate directly to the safety of vertical-wall structure and the decision of the top elevation and funds. Physical models are conducted to research the influential factors for irregular wave overtopping forces. The results show that the key factors are the foundation bed width, the foundation bed height, the height of the parapet to the still water surface, and wave parameters, etc. Based on the least squares method and the multi-varied nonlinear regression model, an empirical equation is fitted about the non-dimensional wave forces and its main influential factors, which may serve as a reference for the engineering design.

Abstract:In order to interpret the real stress characteristics of sheet-pile wharf with relieving platform, we carried out a numerical simulation on it by software PLAXIS 2D, and obtained the displacement of wharf, the moment of front wall, the axial force of piles and the overall factor of safety during the construction state and the service state. Considering the nonlinear characteristics of soil and interaction between front sheet-pile and soil, this method agrees well with the practical engineering. The comparison between results of the conventional elastic foundation beam method and the calculated results proves its feasibility for the analysis of sheet-pile wharf with relieving platform, thus may serve as reference for similar projects.

Abstract:This paper proposes the reliability-based optimization design model that has no problem of convergence compared to the traditional one for the rock-socketed pile which has fewer design variables and more random variables controlling load effect and resistance, analyzes a case about the reliability-based optimization design with the model calculated by matlab, and studies the sensitivity of random variables affecting the design variables. It is concluded that the target reliability index can’t be met by adjusting the design parameters, resulting from that the statistical and mechanical parameters of the load and rock are sensitive. It is suggested to strengthen the statistical work of the parameters.

Abstract:Export container slot allocation of the container yard is a typical NP-hard optimization problem. A mathematic model of export container slot allocation is established under consideration of the container’s mass and target port and targeted at the loading path and the transposition rate of container as a goal. The model is solved by particle swarm optimization algorithm, and the experimental data show that the model can improve the operational efficiency of the yard and it is practical.

Abstract:Based on the wave model test for the section of vertical breakwater with culvert under the action of irregular wave, we study the main factors such as the wave steepness (H/L), relative water depth(d/H), relative plate wide(B/L), relative depth of the culvert into water(t/d) and period affecting the wave uplift pressure intensity on the top of culvert of vertical breakwater with culvert and corresponding variation law. By analyzing the experiment data, we revise and verify the GuoDa formula and obtain the empirical formula for the maximum relative uplift pressure intensity on top of the culvert.

Abstract:The twin-plate breakwater is a new type of harbor engineering structure using twin horizontal plates to attenuate waves and permeate seawater. The horizontal plate expounded in this paper uses steel box-type plate structure. According to the physical model tests, this paper investigates the influence of different supporting forms, different thicknesses of steel plates, different numbers and model numbers of H-beam stiffeners on the stress and deformation of the horizontal plate by the finite element software ANSYS. Comparing the numerical simulation results with those by the traditional calculation method, it provides a reference for the structure design and engineering applications of twin-plate breakwater.

Abstract:A comparative study was made on seismic design of port and harbour structures based on Chinese code, US guidelines and Japanese standards as well as guideline of international navigation association. This is the fifth of the series papers and the method for seismic design of pile-supported wharf in these codes is analyzed. It is shown that for the design of pile-supported wharf, the response force generated by earthquake is determined based on acceleration response spectrum in Chinese code and spectrum acceleration in US guidelines, and the seismic coefficient obtained from analysis of seismic hazard and dynamic response of structures is used in Japanese standard. Several approaches are presented in US guidelines for deformation prediction.

Abstract:Based on the physical model experiment, we carry out a research on the ship’s mooring force and ship movements under various circumstance loads, such as wave, wind and current, analyze the mooring force, movement and energy variation law under different mooring angles and mooring lines’ arrangements, and determine reasonable berth length to serve as reference for the engineering design. The research result shows that the most reasonable berth length is 1.08 to 1.2 times of ship length, the mooring force’s distribution is most uniform, and ship motion and impact energy are most reasonable.

Abstract:The prototype high-pile pier panel corresponding to the physical model test is used as the object of study, by finite element analysis software ABAQUS to establish the finite element analysis model, and according to the static and dynamic calculations for single pier panel and the whole structure, this paper studies the dynamic response of the single panel and the whole structure in different types of waves and the different simplified loads.

Abstract:Using the finite element analysis software ANSYS, we establish a numerical model to simulate a new high-pile wharf in the fluctuating backwater area on the upper reach of the Yangtze River after the impoundment of the Three Gorges reservoir. Mechanical response values of each component under various load cases are extracted based on the static analysis of finite element model considering the plate rigidity of space frame system. The worst case combinations and types of mechanical response values under various load cases are obtained by MATLAB programming. The maximum resultant moment, maximum resultant shear stress and maximum axial force of strength checking effect are achieved to determine the worst stress position of component in the range of frame bent with the same dimension components.

Abstract:During dock construction in sandy site, the dewatering of dock foundation pit affects the displacement of sheet-pile wharf nearby. It can even appear the phenomenon that the sheet pile wall moves to the shore side. Based on a new shipyard project in Singapore, this paper presents the analysis and research for the results of the sheet pile wall displacement monitoring during the dewatering work, and also presents numerical simulation by the application of finite element program PLAXIS. The result of numerical simulation further verifies the correctness of the results of displacement monitoring.

Abstract:According to the feature of gravity quay and project area, a two-dimensional horizontal current-sediment numerical model is established and verified by the measured data. The model is used to analyze the impact of gravity quay on the hydrodynamic of Dongshan bay and sediment conditions and provide the basis for site selection and program layout. The result shows that the tide current field in Dongshan bay has little change and changes mainly locates around the project. The suspended sediment increment scope is concentrated at the east side of the project. The range of siltation is small, and the maximum siltation intensity is 12 cm/a. Overall, the siting and design of the project are feasible.

Abstract:This paper proposes the idea of multi-objective control with the displacement of corner points, internal force of upper structures and base piles flexural controlled. With the help of building ANSYS finite element model, researches the laws of transformation and the force changes of wharf structure under different construction temperatures when the panel suffers a temperature difference or not. Through these laws, conclusions can be drawn that only when the construction temperature is higher than 11.1℃, can the displacement of corner points meets the regulatory requirements when there is no temperature difference of the panel. And the value should be higher than 21.4℃when there is a temperature difference.

Abstract:Rules for scour protection in front of sheet pile in the present Chinese coastal engineering codes are not very complete, so design of scour protection for oversea project is difficult to be accepted. Considering of this, combined with international professional publication and standards, the method to calculate the scour protection in front of sheet pile which is accepted by most of engineers internationally is summarized. Moreover, scours protection for an actual project are calculated and compared by the aforementioned method and Chinese code. On the basis of the results, the shortage of Chinese code that the ship-induced scour isn’t considered is put forward. It is suggested to revise the present Chinese code so as to joint with the international codes.

Abstract:To solve the reasonable investment problems of handling equipment in container terminal, a mixed integer programming model is built with comprehensive consideration on investment cost and average handling efficiency. And a solution algorithm is established with genetic algorithm and system simulation. An experiment about handling equipment investment plan optimization in a container terminal is given to verify the validity of the model and feasibility of solution method. The results show that the model can optimize the handling equipment investment plan with comprehensive consideration on cost and efficiency. The solution algorithm can effectively improve the global search efficiency and the real investment effect.

Abstract:In order to save the coast line resource and guarantee the safety of port operation so as to realize the sustainable development of the port, the upgrading and renovation to the existing wharf tends to be a significant issue of water transport design industry. Taking the renovation project of Guangzhou Zhujiang Power Plant, Shenzhen Mawan Power Plant, Dongguan Shajiao Power Plant A as a study case, this paper analyzes the main problems and solutions concerning the structural plan, handling technology, and wharf auxiliary facilities in the design, hoping to serve as a reference for similar engineering projects.

Abstract:Based on experimental and observed terrain data, we analyze the effect of dredged channel on current and river regime in the North Passage of the Yangtze Estuary. The results show that: 1) The current velocity in the main channel increases significantly after the channel depth is dredged to 12.5 m; 2) When calculating the current velocity caused by dredged channel in the north passage, Le Peijiu’s formula is more appropriate; 3) Digging of the dredged channel for 12.5 m intensifies the change of river regime in the north passage, which is one of the main reasons of the change of river regime in the North Passage since 2009. The effect of dredged channel should be considered sufficiently in the analysis and evaluation of the regulation effect of the Yangtze Estuary Deepwater Channel Regulation Project and other relevant waterway regulation engineering.

Abstract:Taking dredging without siltation as the theoretical basis and current afflux as the key motive force, this paper presents the natural dredging method, which bears the effect of less siltation or no siltation following channel deepening. This method is applied to Lingdingyang channel of Guangzhou and achieves a satisfactory effect. Furthermore, the guiding opinion is put forward for the channel deepening engineering of Yangkou port in Jiangsu province and Jiaxing port in Zhejiang province.

Abstract:Based on the contrast analysis through the flume model tests for the damaging process of different types of spur dikes, the length of spur dike and the pick angle of dike, we discover the temporal characteristics of scour pit depth, observe riverbed erosion topographic effects in different types of spur dikes, based on which, we compare and analyze the test data of different dam types, propose a new dam body cross-sectional structure with better stability, and probe into the mechanism of river bed scouring and dike’s water damage under different dike lengths and pick angles.

Abstract:With the increase of port scale, the fairway greatly restricts the port’s capacity. Therefore, turnout anchorage is proposed to improve the throughput capacity and decrease the investment. This study establishes an Arena-based coastal bulk port navigation operation system simulation model; then determines the optimal site of turnout anchorage and the affection of the quantity of turnout anchorage on the throughput capacity of fairway. Finally, the results show that the throughput capacity of fairway is improved evidently by setting turnout anchorage, and the optimal site of turnout anchorage is the midpoint of the fairway.

Abstract:This article studies the effect of the tetrahedron permeable framework beach protection structure by the flume experiment results show that after the implementation of the tetrahedron permeable framework protection structure, the river flow rate is obviously reduced. The tetrahedron permeable framework beach protection structure is water permeable which can dissipate energy, reduce the near bottom velocity of the water and improve the flow pattern partially, thereby the near bottom velocity of the water may be lower than the non-flushing velocity, even the riverbed deposit can be produced. Compared with traditional beach protection engineering, it can effectively avoid the problem that the entity revetment foundation is easy to be scoured and then affect its stability. It is capable to adapt to the topographic change of river bed without foundation treatment and the need for bottom protection. The tetrahedron permeable framework, which can be directly threw on the riverbed, having the advantages of stability, simple construction and low cost, is a new technology that is worth to be popularized energetically.

Abstract:The Three Gorges project is a large and complex project. From project justification to design and construction, a lot of problems with its navigation technique were studied and discussed. At that time, the experts and technicians of the navigation department made unremitting efforts and found better solutions. The Three Gorges dam was completed and at present the comprehensive benefits of the project are being brought into play. In recent years, the amount of traffic in Chuanjiang river section has been increasing rapidly. The work and its accomplishments in the earlier period, such as the decision-making of the project construction time, the selection of reservoir characteristic levels, the optimization of configuration and layout of navigation structures, the justification and determination of navigation channel dimensions and its maintenance measures, the identification and implementation of navigation scheme during construction period, as well as the optimization of reservoir operation program, etc, are all effective. This paper attempts to discuss the successful experience of the Three Gorges project construction as viewed from navigation, which may be helpful to similar project construction in the future.

Abstract:This paper predicts lockage cargo volume and ship type combination of the planning level years on basis of the analysis of Ganjiang’s lockage cargo and ship type. Based on lock arrangement computer-simulation, this paper researches the effective dimensions of lock, construction scale and construction stages, which provide a scientific basis for decision making of Xingan lock’s construction.

Abstract:The lower section of the south branch, where many active shoals distribute, is the reach with the most frequent and most complicated river regime evolvement in the Yangtze estuary. The paper presents the process and outcome of the 2D numerical simulation about the hydrodynamic condition and the riverbed’s evolvement under the natural condition and the condition of implementing Biandansha shoal protection project, which may serve as reference for the research of south-branch’s river regime evolvement and controlling project.

Abstract:Based on characteristics of longitudinal water level and channel regulation project in reservoir reach of Naji junction, this paper establishes the orthogonal curve two-dimensional current mathematical model for the reservoir tail reach, and analyzes the channel regulation effect for the reservoir reach according to materials of the design stage, acceptance stage and topography after 3 years of completion, as well as the calculation results by mathematical model. The analysis shows that construction site is consistent with the design; the channel dimension and curvature radius of the waterway conform to the design dimensions’ requirement; no siltation occurs 3 years after completion, and the elevation of the unexcavated area is lower than that of the excavated area. In a word, the channel regulation effect meets the design goal.

Abstract:The fluctuating backwater zone navigation flow conditions of Shatuo hub are affected by both the upstream Silin hub daily regulation and downstream Shatuo reservoir scheduling. Based on the 2D flow mathematical model of the two dams, this paper studies the fluctuating backwater zone regulation scheme and presents a scheme optimization. The results show that after implementation of waterway regulation, the shoal reach channel of the fluctuating backwater zone reaches grade IV standard, which provides technical reference for waterway regulation scheme design.

Abstract:The general framework of the intelligent waterway demonstration project construction is developed. With the research and application of the electronic channel chart and ship perception & database integration, we realize the five service functions of intelligent waterway under the design framework, and complete the system construction of intelligent waterway implementing scheme with the integration of guarantee measures.

Abstract:The ball-screw-driven hoist was first used in line 1 ship lock of Liulaojian in north Jiangsu province. In order to reveal the law of motion and force and to provide the theory for further application and transformation, the motion and force of the ball-screw-driven hoist areanalyzed under conditions with frequency transformer and without frequency transformer. The result shows that when the nut runs 1.8 meters per minute at track, the force meets the design requirement of 300 kN whether or not we adopt the frequency transformer; when we adopt the frequency transformer, the motion of ship lock gate achieves“slow-fast-slow”, the motion of the lock gate is steadier, the force of gate opening and closing is larger, and the change rate of both the angular velocity and the force reaches about 33%.

Abstract:Based on the finite element software ANSYS, this paper builds up a 3D finite element model of monolithic lock chamber structure to conduct a simulation for the stress and deformation of this chamber structure in different conditions. The result shows that U-shape reinforcement prestressing technology used in depressed chamber structure is feasible, which not only provides solution to the problem of concrete crack, but also cuts down the cost of reinforcing bar. Thus it may serve as reference for the design of monolithic lock chamber.

Abstract:This paper uses ABAQUS to make a numerical simulation of the indoor model test of double-layered soil with upper crust. Through the analysis of the contours of equivalent plastic strain and displacement vector, the failure mode of double-layered soil is proved to be punching failure. With the increase of upper crust thickness, the expansion of plastic deformation area in sub-soil delays while double-layered soil bearing capacity slightly improves. The curing agent which contains cellulose enhances the strength of upper crust, so that it helps to increase the bearing capacity. In terms of the failure characteristics and ultimate bearing capacity, the results of numerical simulation close to that of indoor model test.

Abstract:In view of the lack of rock transport information at home and abroad, this article performs a back analysis on the slurry pump head and pipe coefficient of friction resistance based on delivery system principle and operational data of Asia’s first heavy-duty self-propelled cutter suction dredger Tian Jing Hao. On this basis, the paper verifies the applicability of the empirical formulas and gets the pipe coefficient of friction resistance of two kinds of rock, one is weathered and mixed with a lot of fine-grained component, and the other is weakly-weathered rock which is almost totally blocks. Considering the pipe coefficient of friction resistance varyend from the hard of uniaxial compressive strength, it is recommended to calculate the pipe coefficient of friction resistance by performing a back analysis on the rock conditions.

Abstract:For improving the soft soil foundation of domestic coastal and inland areas and guarantee the stability of over-water buildings, the sand compaction pile of artificial processing methods of soft soil foundation is widely used in recent years. The sand compaction pile by KS-REACT’s method is that under the action of vibration, the sand pile is expanded in diameter through controlling the air pressure inside the pipe. The application of this method to the soft foundation treatment in the Hong Kong-Zhuhai-Macao bridge resulted in perfect pile quality, fast foundation reinforcement, and low sand loss rate. The measures taken for dealing with the problems in construction provide valuable reference for the compaction pile constructions in the future.

Abstract:Taking Luochengzhou protection engineering in the straight reach of the Yangtze River as an example, this paper probes into the reasons for the tearing of soft mattress of concrete interlocking blocks during construction based on the analysis of the construction condition and the check of the longitudinal tensile strength, and according to the course and phenomenon of tearing, investigates the treatment ideas and methods, and recommends the method for increasing horizontally-moved reinforced bars.

Abstract:According to the experience of construction management of sand piles in Hong Kong-Zhuhai-Macao Bridge Island and tunnel works, the paper presents the method for determining related parameters, which is very important to the pile quality. The quality of sand piles meets the design requirement by checking, and the method presented is proved feasible.

Abstract:With the bigger and bigger construction scale of wharves, ultra-large caissons come into being and gradually develop, which need the help of the crane barge in the process of launching and placing. Taking the ore terminal with a capacity of 400 000 DWT in Dongjiakou area of Qingdao port as an example, the paper demonstrates the launching and placing process of ultra large caissons of 6 000 t. The success of the project has provided reference for the launching and placing process of the ultra-large caissons.

Abstract:The reinforced concrete structure which exposes in the marine environment easily appears damage due to corrosion of reinforced bars, leading to accelerated corrosion damage of the whole structure. Thus it is important to repair the damaged reinforced concrete structures timely and prolong the service life of the structure. For the repair of marine R.C. structures, both the general performance of the repairing materials and the construction environment and matter of durability shall be considered. With the development of material technology and construction technology, various kinds of repairing materials and construction technology adapting to different marine environments have been developed. Some new repairing technologies commonly used for marine structures are analyzed in this paper.

Abstract:This paper outlines the design, construction and quality assurance measures of the frame beams of the prestressed concrete with unbonded tendons in port engineering, especially the anti-corrosion measures for the ends of prestressed structure, deals with technical difficulties of water construction on large-span continuous prestressed concrete structure by the construction technology of sectional precasting and sectional tensioning. Anti-corrosion measures such as bonded tendons are used for guaranteeing the structural safety of the ends of beams.