Abstract:Using technical means of 2-dimensional tidal current and sediment mathematical model , with monographic study on choosing flume of 12.5 m deepwater channel phase Ⅱ project of Kou’an straight reach along Yangtze River downstream Nanjing, selecting typical calculation conditions of water and sediment, the contrast calculation and analysis are conducted of tidal current and sediment movement before and after the choice of flume , along with back silting quantity calculation within the position dredging of the design channel, providing a scientific basis for the scheme determination of choosing flume for Manyusha shoal reach. The calculation of mathematical model indicates that: plan 1 has effect on beach protection and increasing the flow dynamics of the channel shallow section, with less influence on surrounding waters. Considering the maintainability of the channel, adaptability of the traffic organization and adaptability of the coastal ports at the same time, plan 1 is recommended as scheme for choice of flume (unidirectional channel in left and right branch) of 12.5 m deepwater waterway in Kou’an Straight reach Manyusha shoal reach, while in the scheme a slight adjustment to the left bank of the middle route in the left flume is suggested, adapting to the change trend in the deep flume.

Abstract:In the first phase project of 12.5 m deepwater channel of the Yangtze River downstream Nanjing, under the worst working condition for the mattress placing ship, the water depth is 35 m, flow velocity is 2 m/s, and angle of current is 20 degrees. If we use the conventional placing operation method, the anchor cable stress often appears uneven situation. When the anchor cable stress exceeds the set value, the placing ship will lose mooring control. It is the main factor affecting safety. If it’s not effectively controlled, it may cause works accident. Therefore, in combination with the relevant information at home and abroad and the first phase project field operation of 12.5 m deepwater channel of the Yangtze River downstream Nanjing, this paper carries out the calculation analysis using the probability method and ANSYS finite element software, analyzes the anchor cable stress system on the placing ship in big flow velocity, deep depth and shifting current conditions, and puts forward the optimization of anchor system and servo anchor system control method. Through verification by engineering application, optimization of anchor system in combination with follow-up method is reasonable, can effectively control the difficult problem of losing mooring control in harsh conditions, and provides the referential experience for solving similar phenomenon.

Abstract:According to the contact impact happening among the armor blocks of rubble mound breakwater, we probe into the collision stress, crack formation and fracturing process of armor blocks with the FEMDEM. It is found that the fracture and failure generally occur in the outer edges corner or angular point, and FEMDEM is an effective method for simulating the transition from continuous medium to the noncontinuous medium.

Abstract:Laboratory physical model tests are performed to study the influences of different mooring lines combinations on the motion responses and mooring forces of pontoon-type floating breakwater models under large tidal ranges. The mooring systems contain four different mooring combinations, i.e., chain + clump, chain + heave chain, chain + wire rope, chain + nylon rope, of which all mooring lines are arranged parallelly. The advantages and disadvantages of different mooring configurations and different mooring combinations under large tidal ranges are investigated. A kind of mooring system which is suitable for large tidal ranges is given to provide reference for practical engineering.

Abstract:Researches, both at home and abroad, on permeable breakwaters are summarized and influential factors of the permeating wave coefficient are discussed. The model of irregular waves through the vertical breakwater with culverts is simplified, and a physical model experiment is carried out to study how the relative water entry depth(t/d), the relative width of the breakwater(B/Ls), the relative water depth(d/Hs), the wave steepness(Hs/Ls), the relative height of the breast wall(Δ/ Hs) influence the wave transmission coefficients .The error causes are found by contrasting with Wiegel formula , based on which, a new fitting formula of the wave transmission coefficients are proposed according to the relative water entry depth(t/d), the relative width of the breakwater(B/Ls), the wave steepness(Hs/Ls), and its calculation results were compared with experimental records. The research results may serve as reference for the research and design of vertical breakwaters with culverts.

Abstract:In the studies of ship mooring physical model experiment, two wind loads simulation methods, Fan-method and Hanging Weight-method, are discussed. The result of the wind force experiment shows that the Fan-method is consistent with the other three empirical formulas. The testing result of the ship mooring experiment with the wind force only shows that the mooring forces have some differences between the two wind loads simulation methods, but the difference is reduced with the stack wave load, and the force distribution condition of the mooring lines is improved. The above conclusions and reasons are discussed, which may serve as reference for the reasonable simulation of wind loads in physical model experiment of ship mooring.

Abstract:It is a great breakthrough in ocean heavy industry that the manufacturing of the first rail-mounted 2 × 11 000 ton gantry crane in the world, as well as direct unloading, split and assembling for super-heavy industry products. To meet requirements on the rail foundation with extreme heavy loading and strict deformation criteria, a new structure type of composited steel pipe pile and sheet pile with extreme wide integrated relieving slab is developed. No well developed calculation method can be referred at the moment due to its structural complexity. The bearing mechanism and calculation method remain the topics for further research.

Abstract:Mechanics of performance degradation for harbor engineering under stress and chloride ions is discussed. The safety of structure is described by bearing capacity while the applicability is described by stiffness and longitudinal crack. The model for corrosion rate of reinforcement for RC port structures is proposed after considering the effects of stress intensity and duration and chloride ions on structure performance. The deterioration model of bearing capacity, development model of longitudinal crack and degradation model of stiffness characterized by corrosion rate of reinforcement are established based on the theoretical analysis on multiple factors and lab corrosion experiments.

Abstract:When designing a high-piled wharf with pontoon, we need to take the influence of pontoon into account, but there is little research on this project. Based on that, we conduct the model experiment under combined conditions of different water stages and same wave parameters. The model experiment includes three projects, i.e. without pontoon, only pontoon, and pontoon with steel approach bridges in front of the wharf. According to the model experiment we obtain the horizontal wave force and the uplift wave force of three experimental schemes and analyze the effect of pontoon. The experimental results show that the transmission effects of pontoon and approach bridges increase the horizontal wave force to wharf and the blocking effects of pontoon to wharf decrease the uplift wave force to wharf.

Abstract:The dynamic analysis of high-pile wharf under the wave uplift force action is carried out by finite element software ANSYS. The results show that the internal force of dynamic and static calculation in all parts of the wharf structure is basically the same under the action of wave slowly varying pressure, so we can calculate the internal force through static analysis; but the internal force of dynamic calculation is much smaller than that of the static calculation under the action of wave impact pressure, therefore the dynamic analysis may be used to consider the interaction between wave impact pressure and high-pile wharf; High-pile wharf does not produce resonance phenomenon under the wave uplift force action because of the huge difference between wave uplift force frequency and structure natural frequency.

Abstract:In complicated wharf engineering, 3D-based design and FEM not only enhance performance of 2D drawing, and improve efficiency, but also offer strong reference to structure analysis and optimization. In order to better connect autoCAD drawing to FEM calculation and enable FEM file to communicate on the internet, FEM is combined with WebGL and a set of programmes for 3D design and analysis is developed. The programmes are run on Autocad and Adina platform, and start from 2D drawing, build FEM files semi-automatically, and the stress and temperature field are derived. The postfile is further processed so that we can display contour plots and execute interactive operation on internet. The whole set of technical solution integrates design, calculation and display. It is tested and verified on a project with satisfactory results.

Abstract:For the container terminal, the berth scheduling is an important task that affects the terminal operations, and the berth allocation is the primary matter. In order to reveal the degree of influence of berth preference to the results of berth allocation, two aspects including the berth allocation and the influence of preference are studied. In order to optimize both the berth allocation and maximize the preference of berth, a multiobjective mixed integer linear mathematical model under the constraints of the preference for berth is presented. CPLEX is used to solve the model. The efficiency of the model is demonstrated by the experiments, and the effects of berth preference are analyzed. The results are beneficial for the operations of container terminals, and new features are introduced for discrete the berth allocation problem.

Abstract:Sri Lanka Colombo South Container Terminal Project is an international BOT project. To meet the development of container transportation and requirements of operation and management, according to the project layout characteristics, we analyze the problem of land layout in BOT and put forward optimization ideas and optimization proposals of wharf structure level, yard layout, gate layout and auxiliary layout, which satisfies the BOT and employer’s requirement, gets the international engineer’s approval, and ensures the successful construction. It provides reference for similar international port projects.

Abstract:The unloading type sheet pile has enormous complexity of load transfer method and coordination mechanism, thus exploring the structure of the bearing capacity performance is of great significance, especially the bearing capacity characteristics are studied by combining with specific engineering cases for the field measurement. The results show that the walls in the 16 m at the amount of horizontal displacement over time are gradually increased and stabilized, and the overall maximum horizontal displacement of the anchor wall occurs at the anchor point. Drawbar pull is substantially increased in the early deep dredging period, and tends to be steady in the later period. The distribution of lateral earth pressure is approximately determined by the distribution of earth pressure at rest, and the fluctuation is due to uneven distribution of various soil and interlayer, but the overall trend remains unchanged. The excess pore water pressure is reduced at the height of -20 m or more in the active region, following a slight increase under the height of -20 m in the passive zone. All results show that the unloading sheet pile has high bearing capacity mechanism and working performance functions, and can be widely used in large-scale complex deepwater pier projects.

Abstract:This paper summarizes the existing inspection content and methods for high-piled wharf, analyzes the deficiencies of the inspection methods, and discusses the basic principle of the structural health monitoring system (SHMs) of high-piled wharf. The optimal sensor placement of the SHMs is studied, and an adaptive genetic algorithm (GA) is applied to optimize the layout of the acceleration sensors. Based on the case analysis of a highpiled wharf is taken for example engineering, it proves that the method can be applied to the SHMs of high-piled wharf.

Abstract:The land formation engineering of the steel project in Fangcheng port adopts a large area of land reclamation, which will have influence on the tidal prism of the Fangcheng bay and the marine environment. Based on the comparison and analysis of the reclamation area and the tidal prism, this paper proposes the optimal design scheme of the land bench edge, and studies the factors shall be considered for the design of the land bench edge under similar bay mouth position and natural conditions.

Abstract:Wuzhou center port is close to the Xijiang river. The port has superior geographical position and convenient traffic. It is affected by the tide in the Pearl river delta downstream and by the Changzhou hydraulic complex upstream, and the hydrological and sediment conditions are complicated. Based on the analysis of Wuzhou station statistical data, and combining with the waterway regulation practice and project experience, we suggest to consider the influential factors of the low water level in port design, and give referenc value of various factors, aiming to provide reference for the port design.

Abstract:To guard against a variety of potential risks of the overseas port engineering survey, combining with several overseas survey projects, this paper summarizes the ways of identifying the risk source and means of preventing and controlling the risk for the survey projects abroad, focusing on the technical risks caused by survey standards and control survey original data and measurement equipment. It may serve a s reference for similar overseas port survey projects.

Abstract:The 12.5-meter-deep waterway of the Yangtze estuary has stepped into a new stage of stable operation and obvious benefit, but the navigational resources of the North Channel and South Passage in the Yangtze River estuary are abundant, which still have the potential of further development. Combining with the new situation and requirements of the Yangtze estuary waterway development, we point out that the future development keypoint of the Yangtze estuary waterway is the North Channel. By summing up practical experience of the Yangtze River Estuary Deepwater Channel Regulation Project, we probe into the general principles of the Yangtze estuary waterway regulation under the new situation. According to the differences of stream pattern feature, fluvial evolution characteristics and navigation-obstructing properties along the waterway of the North Channel, we propose relevant channel regulation ideas and principles of the upper, middle and lower reaches of the North Channel are respectively.

Abstract:On the basis of the channel conditions and the analysis of the riverbed evolution of Bagua island in the downsteam of the Yangtze River, we calculate specifications of the special two-way navigable waterway of Baota, and carry out the waterway optimization design and adjust scheme design for the navigation marks. The adjustment satisfies the demands of two-way for different types of ships, and the development demand of the enterprises along the Yangtze River. In addition, it provides a foundation for the long-term development of this channel.

Abstract:Using numerical simulation method, aiming at the Ouchikou reach and Guniusha reach in the middle reach of the Yangtze River which are typical navigation-obstructing shoals, the new method to determine waterway regulation parameters is applied to the specific section in waterway regulation construction after the Three Gorge Project reservoir using, practicing and testing the key parameters of waterway regulation, providing applied basis for relevant researches. The calculation results from the mathematical model show that under such regulation parameters, through typical hydrological processes the designed channel dimensions and the expected effect of regulation can be achieved. The results of the waterway regulation parameter theory results apply to the shoals regulation in the middle reach of the Yangtze River after utilization of the Three Gorges reservoir.

Abstract:The south channel in the Yangtze River estuary has always been a good access to the sea with favorable water depth condition. Long series of field data on water, sediment and topography show that a series of regime variations has happened in the south channel, such as scouring in the lower Ruifeng bar and development of central string ditch. Based on the analysis of the recent riverbed evolution characteristics, evolution trend, and siltation characteristics of the 12.5 meters deep water channel of the south channel, we research the regulation strategy of the south channel and put forward the preliminary regulation scheme.

Abstract:The evolution of sand bars and shoals in goose-neck braided reach results in unstable waterway condition. Based on the field topographic data, we analyze the recent scouring-silting adjustment in the Xinzhou goose-neck braided channel. The results revealed that the implementation of the channel regulation works stabilizes the channel boundary condition; The goose-neck reach maintains the plane pattern that Xinzhou and Ya,erzhou river islands partition the river into three branches; The sand bars and shoals are basically stable, and obvious adjustment of the status of the branches will not occur in the future. However, since the decrease of the sediment transportation from upstream caused by the impoundment of the Three Gorges project, the deformation of the head of Xinzhou and Ya’erzhou river island, together with the river boundary will proceed, which requires more analysis and implementing appropriate measures timely.

Abstract:To study the influence of ship’s berthing and departing operation in the mixed waters on its navigable efficiency, we establish the marine traffic flow volatility model in mixed areas based on traffic wave theory and combining with the traffic flow characteristics of the ship to explain further the vessel traffic flow gathering and dissipating process during berthing and departing operations. According to the vessel traffic volume, speed, the current density of the ship and relying on the time from the mooring operations, we establish the mixed- water interference range & time model. Taking the Fujiangsha south channel for example, we carry out a research on the vessel navigation efficiency in mixed waters under the safe condition.

Abstract:The research on Yingpan shiplock shows that the water-saving ship lock can not only decrease lock’s consuming water, but also lower lock’s working water head so that as to simplify hydraulics technical problems. The relationship between the area of storage pool, steps of storage pool and water-saving efficiency is expounded based on the principle of water-saving ship lock. The ratio of chamber area and storage pool area should not be three times or steps of storage pool not greater than three. The application prospect of water-saving ship lock in inland river navigation is also analyzed.

Abstract:For ranking and comparing different design results of the channel width given by different codes to promote the reasonable design of channel width, comprehensive evaluation indices are determined from the point of navigation safety and efficiency after analyzing and comparing three different kinds of channel width design codes. The entropy weight-TOPSIS-grey correlation comprehensive assessment model is built, in which, the objective weight of each index is obtained from the entropy method. The positive & negative grey correlation grade between alternative schemes and positive & negative ideal solution are calculated respectively, and the grey correlation relative closeness between each alternative and ideal solution is obtained. So the scheme ranking and optimization can be achieved based on the relative closeness. Given practical assessment situation, three different kinds of design codes are taken into practical example analysis and assessment. Then, from the view of navigation safety, navigation efficiency and comprehensive benefit, the reasonability of the channel width given by different codes for the given situation is clarified. The assessment result tallies with the actual situation and can provide the basis for further study and development for the channel width design code.

Abstract:With more regulation buildings constructed in the Yangtze River waterway, the water security problem about waterway regulation buildings is increasing. Since there are no technical regulations for this problem in China, this paper presents a navigation AIDS based on the classification and protection requirements of waterway regulation buildings, and gives a structure and setting method for the prompt and prohibited class marks respectively.

Abstract:The reliability analysis of hydraulic steel gates has always been a hot spot. Domestic and foreign scholars have conducted a lot of explorations and experiments. They have achieved many achievements and meanwhile raise more questions. Among these studies, those on the system reliability of gates gradually show great importance and urgency. This paper summarizes the research on the system reliability for hydraulic steel gates and makes an appropriate outlook for it , hoping to provide reference for further research in this field.

Abstract:For the flow-induced vibration problem of the large-scale plate valve of a ship lock, we employ the method of mode test and FEM simulation to study the self-vibration characteristics of the plate valve. The result is applied to conduct the dynamic optimization design of the structure. The hydro-elastic model test is conducted to study the flow-induced vibration characteristics of the valve. It is found that the test value and the calculation value of the self-vibration frequency and the mode shape of the valve are consistent. The basic frequency is improved obviously, which avoids the high-energy region of the flow pulsation. The flow-induced vibration response is relatively small and will not induce harms.

Abstract:The main work pattern of harbor engineering investigation and design industries is two dimensional separated working. Its features are designed separatedly. The data store in different documents and tables, and information exchange by lettering. This pattern is not only ineffective and difficult to share data, but also makes mistakes and omissions easily. This article proposes a new work pattern of harbor engineering investigation and design industries, which is three dimensional designing based and with whole production process integrated, realizes full profession three dimensional design, seamless data link, customizable auto analysis, customizable result data output and product lifecycle management. This article proposes the system design of the new pattern. The design divides the system into three levels, taking account of generality and specificity of engineering design and realizing good system architecture separation and well system expandability.

Abstract:As per technical specifications in New Doha Port Project, the ground shall be improved to medium dense to dense for granular deposits and firm to stiff for cohesive deposits. CPT is proposed as ground testing method after ground improvement. Firstly, soil classification is undertaken based on cone resistance and friction ratio of CPT. Thus soil is classified into granular and cohesive type. For granular deposits, CPT acceptance criteria are established by the correlation between relative density and cone resistance. For cohesive deposits, CPT acceptance criteria is established by the correlation between undrained strength and cone resistance. The soil classification system and two types of acceptance criteria based on CPT are greatly suitable for ground testing and they are worth popularizing.

Abstract:Based on the comparative analysis between the Developing Standard for Changjiang Electronic Navigational Chart(CJENC) and international standards, we summarize the problem and shortage of the existing standard. Meanwhile, combining with the characteristics of Changjiang waterway and production experience, we propose reasonable revising suggestions to promote it a universal standard featuring the special characteristics of the Changjiang waterway, so as to ensure the versatility and accuracy of CJENC based on the standard, and ensure that CJENC be used widely.

Abstract:Pile foundation calculation model of high-piled wharf is established applying an axial spring on a certain position of the pile body. According to the calculation formula of axial stiffness coefficient of pile in Design and Construction Code for Open Type Wharf on Piles, a calculation method for the stiffness coefficient and applied position of the axial spring in different situations is given. By the method, the axial stiffness of pile foundation model in imaginary fixing points method and m-method calculation mode are same and consistent with the code. Combined with this method, two spatial finite element models for a high-piled wharf engineering example are established by imaginary fixing points method and m-method respectively. The comparison of the calculation results show that axial force of pile shaft, bending moment at pile top and the internal forces of each component in superstructure are similar. It proves that the suggested method is feasible and reasonable, which serve as references for structure calculation of high-piled wharf.

Abstract:High vacuum densification method (HVDM) is recommended for ground improvement. To obtain the most economic and reasonable construction parameters, two test-areas, zone A and zone B, are performed in steel stock yard and goods yard respectively. Post testing results indicate that, in zone A, the allowable bearing capacity reaches at least 225 kPa, average SPT value of sand layer in 0~8m reaches 20.6 blows and average CPT Ps value of sand layer reaches 7.48 MPa. In zone B, the allowable bearing capacity reaches at least 196 kPa, average SPT value of sand layer in 0~7m reaches 17.0 blows and average CPT Ps value of sand layer reaches 6.21 MPa. This project, which is a typical ground improvement case for projects using Changjiang fine sand for reclamation, offers a valuable reference for similar projects.

Abstract:Reliability is carried out on frame pier,s pile foundation based on Monte Carlo method and taking the moment effects the control condition. It is found that under combined effect of seven working conditions, the reliability index of each pile can basically meet the specification requirements. Although all bored piles′diameter is 1600mm, the reliability index of pile 1~4 is too large, thus it is suggested to optimize on the pile foundation .

Abstract:Based on the project example, we obtain the parameters of large-scale geotextile bag filled with silt, give the relationship between the filling pressure stress and circumferential force between the bag bodies, and get the turnover rate of the filling bags of certain specifications. Based on the analysis of the foundation’s settlement displacement, we adjust the standard controlling the settlement displacement under the prerequisite of guaranteeing the stability of the foundation, and achieve the objective of improving the construction efficiency, shortening the construction period, and cutting down the construction cost.

Abstract:In the structural design of foundation pits in soft soil area, the overall stability plays a controlling role. For the pits which can’t meet the stability requirements, it is an effective solution to increase the penetration depth of supporting structure. However, this method works not obviously for the narrow pits with space effect. Taking a soft soil pit project for example, we account the coupling effect in the central of the narrow pit with double sliding surface, propose to increase the resistance torque of sliding using the passive earth pressure of the coupling surface, which will reduce the penetration depth of supporting structure effectively. This method provides a reference for narrow pit design in harbor engineering.

Abstract:The gravity type wharf mainly relies on its own gravity against sliding and overturning of the building. The wharf structural subsidence and displacement are large and with a long duration, which will directly affect the application effect after completion of the terminal. Combining with actual construction management experience of a project, we probe into the way of controlling and decreasing the gravity wharf structural subsidence displacement from aspects of the observation and analysis of actual construction guidance, so as to improve the operation effect of port after completion and prolong the service life. The scheme and construction analysis guidance has resulted obvious effect in actual construction, and achieved a certain economic benefit, providing reference for similar project construction.