Abstract:Manyusha shallow is located at the Kouan straight reach, which is an underwater braided channel. Manyusha shallow is one main navigation obstacle shallow in the Yangtze River downstream. Based on the analysis of riverbed evolution and the physical model test, we analyze the evolution characteristics of Manyusha shallow in the recent period and the navigation obstacle characterisitcs and the causes, and establish the regulation idea and regulation engineering scheme of Manyusha shallow. According to the results of the model test, we analyze the regulation effects after the implementation of the recommended project and the effects on the river regime of Yangzhong reach.

Abstract:The staple fibers and nonwoven geotextile is one of the most important material in the 12.5-meter deepwater channel project in the Yangtze River at the downstream of Nanjing. To ensure the accuracy of the tensile test results, through theoretical analysis and experimental comparison, the paper studies the influential factors of tensile test in the aspects of humidity, temperature, the width of the specimen and the tensile rate, and puts forward the precautions during the tensile test of polyester staple fiber nonwoven geotextiles.

Abstract:Based on current status of transport energy consumption and carbon emissions in Haikou, considering the economic and social development and the features of harbor city, the transport development goals under low carbon perspective are analyzed. This paper researchs the comprehensive transport system, traffic structure, traffic technology level, and transport equipment, focused on the green port development. The low-carbon transport is adapted with the economic and social development of Haikou, while with the characteristics of “green, accessible, wisdom, and slow travel”.

Abstract:To construct an artificial island in Qiongzhou Strait, which is under a fairly complex hydrodynamic environment, we shall not only consider the stability of the artificial island itself, but also recognize the changes of flow field in the surrounding waters and sediment erosion and deposition caused by the construction of the artificial island. In order to study the impact of the construction project, we research the change of tidal current field after implementation of Ruyi artificial island project based on the physical simulation of tidal current and sediment, and obtain the scope of strength of impact. We also analyze and predict the silt erosion and deposition in the sea area which the project locates, and draw the conclusion that “the construction of the artificial island exerts some impact on the surrounding waters”.

Abstract:The applicability of the estimation of the directional spectrum based on wavelet transform is discussed using the data generated from the numerical simulations. The analysis focusing on the influences of measured array types, wave incident direction, directional concentration and sampling lengths on the directional spectrum based on wavelet transform is carried out, which shows that the wavelet direction spectrum is more widely applicable.

Abstract:Large circular caisson revetment is applicable to deep waters. Physical models are conducted to research the influence factors for wave forces on large circular caisson with connectors, the results show that the key factors are the position of wave wall on the structure, the height of wave wall, waves parameters, etc. on the basis of comparison of different theoretical methods of horizontal wave forces and experimental results, the modified Goda is given for total wave forces on large circular caisson revetment. The method can be used as reference for further research and engineering design.

Abstract:Based on the physical model test, we carry out a research on the wave overtopping at oblique and vertical revetment with the irregular wave, analyze the influence of main factors such as the levee free-board and the width of the platform on the wave overtopping, and compare the result calculated with the existing formula about the over topping volume and that of physical model test. The research result may serve as reference for the engineering design.

Abstract:This paper focuses on the quantitative analysis and prediction on the impact of suspended sediment to the inshore water quality during Zhuhai port LNG channel dredging and construction process. To fully understand the distribution of inshore tidal current, on the basis of the inspection on the hydrological characteristics of the project sea area and its nearby waters, combining with the data from the test flow and tide gauge stations, as well as information on the preliminary work, this paper uses a numerical simulation method to simulate and calculates the state of tidal current field of the project sea area and its nearby waters, and reproduces its movement and characteristics. On the basis of the simulation of tidal current field, this model will predict the transport and diffusion of the suspension and be used to analyze the impact to the inshore water quality during construction.

Abstract:The procedure and essentials for the design of steep slope embankment are expounded and the steep slopes of Yangshan port are taken as demonstration. The backfill material and the friction coefficient of the original mountain should be carefully selected for the design of steep slope embankment of the areas with the mountain ridge and overlapping hills. The reasonable parameters should be obtained from the site conditions to satisfy the purposes of stability and reduce the costs. Ratio of slopes and sliding retaining walls with reasonable height should be taken into account during the selection of measurements for the backfill of roadbeds. The gravity retaining wall with basements inclined inward can improve the safety coefficient obviously with excavation or blasting engineering quantities increasing little. The measurements for steep slope embankment may provide some reference for the slopes of the same kinds.

Abstract:Based on the natural moisture content and density test, specific gravity test, grain size analysis tests, water content limits test, compaction test and tri-axial consolidated undrained shear test of remodeling sample of sliding soil under different shear rates for the sliding zone soil of a landslide in Badong area, we explore the change trend of shear strength parameters of the sliding zone soil under different shear rates, analyze the stressstrain relations of the sliding zone soil samples, reveal the physical and mechanical characteristics of sliding soil and its effects on the landslide, hoping to offer valuable basic recommendations for the prevention and cure of this type of landslides.

Abstract:This paper analyzes the wave pressure on the sea face of the longitudinal beam and the horizontal force of the upper structure through the physical model test. It points out dominant factors which influence the horizontal force of the superstructure, such as wave height H, longitudinal beam height R, overheight Δh, wave period T, as well as the number of longitudinal beams n affected by the single wave crest. The formulas of wave horizontal force are fitted by the actor analysis method, and the calculated values are compared with the trial values.

Abstract:Hambantota port, Sri Lanka is constructed based on the creative idea of “building a new harbor at the site of lagoon in line with local site conditions” via optimizing the general layout to provide sufficient space for its further development. The dry construction condition is achieved through cutting off concrete wall on the cofferdam instead of conventional method, i.e off-shore construction. It is of great value as the reference for the design and construction methodology of cofferdam.

Abstract:Wave transmission at low crested and submerged breakwater will affect the wave height in the harbor. 2-D and 3-D tests on the wave transmission ratio in the harbor are carried out for different arrangements. The results show that the wave transmission ratio attenuated with the distance away from the breakwater under the oblique wave action, and is less than the values in 2-D test when the sites are far away from the breakwater. Also, the wave transmission ratio will be decreased in the harbor as the wave transmission range of the breakwater is reduced. The paper puts forward some suggestions on the engineering design.

Abstract:Three-dimensional model test in wave basin is set up combined with the project of Haifeng power plant terminal. The design wave parameters for the breakwater, wharf structure and revetments are obtained in the wave basin. Also, the overtopping on wharf surface and the distribution of wave heights are studied in the experiment. Based on the test, the wave heights distribution in different layout schemes are analyzed to determine the optimal scheme and provide a scientific basis for the design and construction of the harbor. Meanwhile, the effect of excavation of navigation channel and construction of breakwater on wave transmission is briefly discussed.

Abstract:In Shanghai international shipping service center project, the large-area yacht dock basin locates above large-scale underground space, so the waterproof system for the dock basin is essential to the use of the underground space. The waterproof system is studied through the waterproof of RC structure, waterproof using external material and steering of vapor.

Abstract:Field measurements are made of time series of tidal elevation, current velocity, salinity and suspended sediment concentration at three hydrological gauging stations CS1, CSW and CS8, within the curved three hydrological gauging stations CS1, CSW and CS8. Strain induced periodical stratification is predominant at these locations. It is found that the tidal straining is the key mechanism for the stratification within the waters of the curved channel. The rate of change in the potential energy dut to estuarine circulation is smaller than that dut to tidal straining and tidal stirring by the order of 102 ~ 103. navigational channel of the north passage of the south branch/south channel of the Changjiang River estuary, on spring, moderate and neap tides, on 1 to 10 January 2010. Those data display the spring/neap and flood/ebb tidal variability in the vertical stratification caused by salinity and suspended sediment concentration.To quantitatively evaluate the potential of vertical mixing within the curved channel, we estimate the gradient Richardson number (Ri) using the density of water after taking suspended sediment concentration into account. Ri at stations CS1 and CSW can be in the order of 101 ~ 102 at the turning of the tide. The strongest mixing with the order of 10-2 ~ 10-1 occurs at the maximum flood and ebb tides. Ri at station CS8 is between 0.25 and 5 at the flood tide and of the order of 10-2 at the ebb tide. At the three hydrological gauging stations, stratification appears to be stronger at the flood tide than at the ebb tide. Stronger stratification is present on the spring tide, while stratification lasts longer on the neap tide.Following Simpson, we estimate the rate of change in the potential energy of the water column within the curved channel caused by tidal straining, estuarine circulation, and tidal stirring. Tidal straining is present at the

Abstract:Jiayu-Yanziwo section is a key navigation-obstructing shallow section emerging in the middle reach of the Yangtze River, and it is of great importance to regulate this part of section for the smooth navigation in the middle reach of the Yangtze River. The main purpose of the project is to protect the bottomland and stable the waterway. The project adopts the beach protection structure, which is built on the head of the bottomland to prevent scouring. After the implementation of the project, the situation of the river course becomes more stable, the deposit occurs at the Fuxingzhou point bar, and the bar widens, the Yanziwo beach becomes stable, thus the waterway is stable, the flow concentrates easily in the low water, the shallow ridge is scoured efficiently, and the degree of navigation-obstructing is relieved. It is thought that the effect of the channel regulation project will become more obvious along with the implementation of the structures’ functions and expected goal will be reached.

Abstract:At present, more and more bridges are built on the Yangtze River, thus the building density is large in main urban areas and developed regions, which leads to the phenomenon that the spacing between the new bridge and old riverside buildings such as port is insufficient. On the basis of GB 50139—2004 Navigation standard of inland waterway, we analyze the method of the research about spacing between bridge and riverside buildings such as port, anchorage ground, slipway and water-intake. Furthermore, the requirement about the bridge number control and the navigation opening arrangement are discussed to reduce the impact on navigation and better serve the inland navigation industry and economic construction along the Yangtze River.

Abstract:The calculation of deficiencies exists in the Design Code of General Layout for Sea Port concerning the channel width for the very large vessels required. This paper analyzes the effects of the leeway and the drift angle resulted from current to the width of ship’s tracks. A calculation method for the ship’s track width based on a series of simulation trials’ results using the linear regression method is presented , which had tested by a real project. It may serve as reference for the design and maintenance of the port and shipping engineering.

Abstract:In order to provide a scientific basis for the construction of deepwater channel at Quzhou bay, we study systematically the water & sediment features, morphological evolution and channel stability based on the real investigation data of Quanzhou bay, and then forecast the siltation after the implementation of the channel engineering. Results indicate that the sea bed of Quanzhou bay has good stabilization. Water depth measurements after constructed show the deepwater channel is very stable. The research result provides reliable instruction for the deepwater channel project of Quzhou bay.

Abstract:Combining with an engineering case of a foreign breakwater under soft soil geologic condition, we carry out the stabilization and deformation analysis of the whole process of breakwater construction simulation of finite element method based on Biot consolidation theory, and compare the result with that by conventional calculation method. We also expound the application of foundation stabilization calculation according to the European Standard and the British Standard, the formula derivation of excess pore water pressure stability control standard, the analysis of drainage plate and wave loading on foundation stabilization. The result may serve as reference for foundation stability analysis of the breakwater engineering.

Abstract:After consolidated by vacuum preloading, recently superficial hydraulic filled mud soil commonly forms a small region, which has a higher strength around the drainage plate. This zone with a higher density, greater shear strength and small settlement, is so-called the “soil pile”. The poor consolidation result of the region outside the “soil pile” causes uneven reinforcement phenomenon in a large blow filled silt field. To analysis this phenomenon, we firstly conduct an indoor model test of superficial hydraulic filled mud soil under vacuum preloading to research the particle composition, settlement, pore pressure head height and water content. Secondly, we adopt numerical analysis software PFC2D to explore particle’s forming mechanism from the micro sight. The indoor model test shows that uneven settlement is formed in soil after vacuum preloading. Obvious uplift is developed around the drainage plate with the radius of 20 cm to 25 cm. The content and density of fine particle gains highly, and its permeability coefficient decreases around the drainage plate, forming a relatively dense and weak permeability “pile” phenomenon. The numerical simulation indicates that under the influence of negative pressure, particles moving down results soil’s consolidation. With the effect of negative pressure in drainage plate, soil particles nearby drainage plate move to drain board direction which result in the “soil pile”.

Abstract:The overall stability of a port determines the project’s success or failure. The effect of the foundation with soft soil interlayer on the port’s stability can by no means be ignored. Taking Lvsi fishery port in Jiangsu as an example, the essay analyzes the impact of the soft soil interlayer on the overall stability of a port, sums up relevant rules and conducts tentative calculations with reference indexes offered. Moreover, it proposes solutions to the cases where the foundation does not meet the stability requirements, which serves as reference to the port’s design and construction in similar geologic situations.

Abstract:Based on the PDA test on the 70～76 m long steel tube piles driven into Yangpu harbor of Hainan province, we probe into the behavior of the super-long steel tube pile in deep clay and draw conclusions as follows: 1) The super-long steel tube pile in deep clay area behaviors like the friction pile, and the friction resistance is over 80% of the ultimate bearing capacity; 2) The tip resistance of super-long steel tube pile in deep clay the can be fully functional, and the plugged effect of the pile tip is about 0.83; 3) The energy transfer coefficient of super-long steel tube pile in deep clay is about 0.30. Furthermore, the behavior of super-long steel tube piles is discussed with respect to their contribution to the bearing capacity in deep clay area.

Abstract:For the hydraulic structures of wharf node composed of the 2.2 m-diameter pile filled with reinforced concrete and the 1.5 m-diameter vertical and horizontal of ties for hollow tubes, based on secondary development and parallel algorithm of large general finite element software Abaqus, we establish a 3D numerical model of wharf considering the nodes local refinement. According to the comparison and verification of spot test and numerical analysis of large variation of parameter, we get the nodes’ mechanical behavior of the core reinforced concrete pile stress, the outer steel casing stress, the vertical and horizontal ties stress, the tensile force of reinforcing and the failure mode, and analyze the working condition of nodes of the most unfavorable load combination. According to the mechanical behavior of the nodes and the principle of “Strong Connection & Weak Components” , we optimize the design on nodes.

Abstract:Considering that the shipyard dock renovation and expansion project of Zhejiang is characterized by extremely limited shoreline and space, complicated geologic conditions, confined construction conditions, we propose a dock wall structure, i.e. double-wall bored pile dock wall structure. Based on the analysis of the mechanism and calculation methods, this paper gives a numerical simulation method and detailed stress analysis for the new structure, which provides reference for similar projects.

Abstract:Pile foundations are widely used in compressible soils such as calcareous sediments. Based on an introduction of the origin, distribution, basic physical properties and mechanical properties of calcareous soils, it is concluded that traditional driven piles are ineffective in calcareous soils and the reasons for it are analyzed. A review of the published literature pertaining to pile foundations in calcareous soils is summarized, and two new types of piles are described, along with their structural types, construction methods, bearing capacity characters, existing problems and comparison between them. Each method has its own advantages and disadvantages. Some improved schemes are proposed and new research approaches combing experiments with numerical simulation are suggested.

Abstract:Safety risk control is the core content of project safety management. According to the characteristics and construction technology of large-area vacuum preloading engineering for soft foundation treatment of reclamation engineering, we identify the dangerous source existed in the construction process, analyze and evaluate the risk source with the LEC method, and determine the risk level of each risk source, so as to further determine the 4 major security risks: walking capacity of workers in poor areas, power line connection or breakage immersion in water, blowing sand ship encountering seasonal winds, insertion machine track foundation instability, etc. Developing special safety related control measures, and focusing on prevention and control, we prevent effectively the occurrence of the accident.

Abstract:A general calculation formula for the average physical index’weighted processing is deduced according to the relationships among the different calculation amount, physical index and soil thickness for layered soil. The paper gives the expressions for the average index such as the average soil severe, average fiction resistance of pile sides, horizontal average permeability coefficients, equivalent value of the soil compression modulus, shear wave velocity of soils, average permeability coefficients in vertical dimension and the average proportion coefficients. This paper also analyzes the error size and changing rule of different calculation methods for the same physical index.

Abstract:For tensioning several prestressing tendons of tubular piles uniformly at one time, we carry out a theoretical analysis of and test on the prestress loss in the process of the batch prestressing. The result reveals that the batch prestressing bears satisfactory effect and the real loss rate of the prestress accord basically with the theoretical result.

Abstract:Two dry dock excavation pits in Nansha of Guangzhou are both large in area and quite deep. The soft soil foundation in the pit is already treated by vacuum preloading, and the mud is very thick and its lateral permeability is very poor. Some drainage boards are buried under the soil, and they provide a good channel for the vertical seepageof underground water. Based on the geologic condition, theoretical projections and by launching a study on the deep pilot test area, we select a deep well point precipitation method, which ensures safe and efficient dry construction conditions for the excavation processing, and is proved suitable and rationali for the use of a deep well precipitation. The results of the research may serve as a guide for similar projects, and provide a practical basis for the amendment of Port Engineering Foundation Norms (JTS 147-1—2010).

Abstract:In order to guarantee the quality and efficiency of a deepwater breakwater’s 1 510 m long crest wall, according to the difficulties that the wave breast wall is of 6.5 meters high, containing 20% stones, and with narrow passages, etc. we carry out a research on the construction technology of the crest wall, and develop the integrated construction technology of gantry mounting and template innovatively. For the technology, we design the bottom crest wall gantry mounting and the top crest wall gantry mounting in view of the template’s installation, riprap technology, as well as the allocation of resources. By the special technology, we realize the quickest construction at that time under the prerequisite of guaranteeing the casting technology of the crest wall.

Abstract:In the BT project, the construction contract, which carries the dual responsibility of builders and contractors, is an important element of a contract system . How to maintain the interests of builders and contractors, effectively avoid all kinds of performance risks and reduce the negative impact as low as possible, becomes an important part of risk management contracts. Based on a BT project contract case, we identify and analyze the actual sources of risk response measures of the contracts, so that more contract managers will pay attention to the risk management, accumulate and share successful experience.

Abstract:This paper describes the five construction methods and spreading process for the coastal cutter suction dredger designed and built by CCCC Tianjin Dredging Co., Ltd., compares the advantages and disadvantages of each method, and draws the conclusion that “the construction efficiency can be improved by proper construction method”.

Abstract:Being an important procedure of high-pile pier, berthing member installation is related to the construction progress of pier upper structure and the straightness of pier front edge, In order to improve the installation efficiency and save the construction cost, we present a rapid installation process, which is proved reliable and practical by the calculation analysis and engineering practice.

Abstract:The large cutter suction dredger has a strong capability of dredging and transporting, and can excavate the hard-ground deep water channel, the process of which has become increasingly mature, such as the cutter suction dredger’s direct barging technology and stern-blowing barging technology. However, the anchoring of cutter suction dredger in the hard-ground deepwater channel becomes the key factors of barging technology. The cutter suction dredger method is to take the stern’s steel pile as the axis, and excavate through sliding transversely the anchor’s pull yaw, and it is also known as the fan-shaped transverse dredging method (including the steel pile trolley). Taking the anchoring technology of the cutter suction dredger for the hard-ground deepwater channel as the study case, this paper summarizes the optimization of the anchoring technology to serve as reference for similar constructions.

Abstract:The electric-hydraulic dredger is the major construction ship during the land reclamation project which has advantages of shallow draft, flexibility, lower cost and great adaptability. With the continuous expansion of the inning project, the sand-blowing distance required increases, but the blowing distance of the electric-hydraulic dredger itself cannot meet the construction needs. In order to solve the technical difficulty of the long-distance construction, we increase the relay pump along the pipeline. Meanwhile, according to the auxiliary loader project of the Fifth Commercial Aircraft Runways in Shanghai Pudong airport , we obtain the proportional relationship between the pump power and the long-distance pipeline under the condition of the fine sand. It can not only determine the reasonable position of the relay pumps to solve the technical difficulties of the long-distance construction, but also cut down the construction cost, and improve the efficiency of construction efficiency.