Abstract:With the aid of the model experiment and the method of theoretical analysis，we analyze the distribution disciplinarian of gross dynamic hydraulic pressure and fluctuating pressure near the spur dike. After drawing the distribution isoline of fluctuation pressure, we divide the area near the spur dike into four areas for the measure pressure, and explore the distribution disciplinarian of gross dynamic hydraulic pressure and fluctuating pressure. The influential factors such as the length of spur dike, flux and depth of flow are also analyzed.

Abstract:The problem of saltwater intrusion in the Pearl river delta is very serious especially in recent 20 years. The Pearl River network is complicated with hundreds of channels connected and 8 outlets in the downstream, which makes the hydraulics in the delta much more difficult to analyze. Numerical model is considered as the main method to study the saltwater intrusion because numerical simulation can reduce cost and time as well.To analyze the process of saltwater intrusion, we set up the model with a combined mesh style (triangular and quadrilateral) , which covers both the Pearl River network and the estuary, and finite volume method is applied to discrete the space. The result showes that the calculation values of tide level, flow velocity and salinity are consistent with the measured data, which proves that this model can be applied in real engineering.

Abstract:The magnitude and distribution mode of the skin friction resistance has considerable influence on the settlement of the sheet pile, and further on the stability of the revetment reinforced by the sheet pile. The settlement is an important study content while the sheet piles of the revetment structure are driven to the relatively hard layer. Field experiment is carried out in the actual sheet pile improved revetment project at Huzhou section of Chang-Hu-Shen waterway to research the distribution mode and magnitude of the sheet pile's skin friction resistance. Stress gauges are arranged on the axial line in the pre-process of the sheet pile, and the jointing and embedding manner are presented. Through detected stress gauges, the axial force and the load transfer mechanism are adequately studied respectively in the harden progress and the loading procedure. The stress gauges in the sheet pile will bear pull force firstly then turn into press force and tend to be stable during the concrete solidify progress. Stress gauges should be recalibrated to analyze the load transfer mechanism under increasing loading, owing to the great inference of construction load on the stress gauges. The axial force of the top pile exhibited considerable variation, but the middle and under part of the pile show small changes but large values, and the pile load on the top is easily transformed. The skin friction resistance is fully played near the top pile; it accounts for 40 percent of the all skin friction resistance for distance shorten than 0.3 meters to the top pile. The recommended value of the ultimate skin frictional resistance in the Technical Specifications (JGJ 94—2008)is much larger, and the measured maximum friction is only 63.9% of the recommended value.

Abstract:Earth pressure distribution and variation on foundation bucket of bucket foundation breakwater were simplified to the plain strain condition and studied by FEM. The numerical investigation shows that the earth pressure on the harbor side surface outside the harbor ward side bucket increases significantly, however,earth pressure on surface outside the sea ward side bucket decreased significantly, they affected the stability of breakwater notably. In the middle of the partition, earth pressure changed invisibly, displacement of breakwater and soil was likely the same. Harbor ward inner wall of seaward bucket decreased and sea ward inner wall of harbor ward bucket increased to a certain extent. Then earth pressure distribution on each wall under limit stated was analyzed for simplified stability analysis.

Abstract:The species of raw material, gel material content, water-binder ratio, amount and ratio of mineral admixture, and selection of formwork system are changed to explore the change law of the concretes compressive strength, resistance to chloride ion permeability, and appearance quality. With a water-cement ratio ranging from 0.34 to 0.38, cementitious material greater than or equal to 420 kg/m3, mix with 30% to 60% of fly ash and slag in the ratio of 1颐2, mix with 20% of the super-fine limestone powder, as well as the use of defoamer and air-entraining agents, we may improve the polycarboxylate superplasticizer. Under the strict control of the quality of raw materials, and painting polyurethane template paint, we can make anticorrosive fair-faced concrete with a strength of greater than C40, 56 d chloride ion diffusion coefficient of less than 3.0×10-12 m2/s, and the appearance meeting the JGJ 169—2009“Technical regulations for application of fair-faced concrete”.

Abstract:Construction spoil generally occupies a lot of land and leads to environmental pollution and waste of resources, hence the appropriate treatment and application of it as a part of structures not only saves investment, but also is helpful to the environmental protection. Based on geogrid reinforced retaining wall and failure mode of reinforcement theory, we put forward a new idea in the design of reinforced earth retaining wall of water transport project, and carry out a computation of the structure, considering especially the soaking conditions. The results show that the new retaining wall structure is safe, reliable, and suitable for the weak ground and regions lack of backfill.

Abstract:Towing line safety is an important component of the towing safety. In order to ensure the towing line safety of the marine towage, we put forward the method of determining the length and sag depth of the towing line according to the water depth and sea condition, and based on the analysis of the relationship between the towing resistance and the length & sag depth of the towing line, which makes the towing line more flexible and without touching the seabed. By relative measures, we can avoid the damage or breaking of the towing line and thus achieve the objective of safe towing.

Abstract:The frequency domain theory of the interaction of regular waves and the permeable seawall are analyzed. The forces of the permeable seawall and revetment are calculated and analyzed under different drafts,distances to the bank and porosity. Using the spectral analysis theory, we analyze the spectral characteristics of wave forces under different drafts and distances to the bank, and determine the cumulative frequency of the horizontal wave force of permeable seawall under irregular waves. It is known that wave forces of the permeable seawall are very sensitive to the porosity G and wave frequencies 棕.

Abstract:This paper simulates the characteristics of 3D U-style 180毅bend flow in an open channel using software Fluent with k-棕turbulence model and VOF model, to solve the Navier-Stokes equations. The comparison between the numerical simulation result of water depth and experimental data proves that the numerical simulation can effectively forecast the variation range of both water depth and transverse slope of water surface. Furthermore,horizontal flow fields in different water depths and distribution of circular current in typical sections are analyzed.

Abstract:According to the model experiment on the wave forces on the upper structure of the wharf under combined conditions of different water stages and the same wave parameters, we obtain the maximum horizontal wave force, the maximum uplift wave force on the upper structure of wharf, the uplift wave force corresponding to the maximum horizontal wave force, and the horizontal wave force corresponding to the maximum uplift wave force. The phase difference between the maximum horizontal wave force and the maximum uplift wave force are analyzed, and the tested data for the maximum uplift wave force is compared with the theoretical value. The experimental results show that with the increase of water level, wave force on wharf upper structure increases first and then decreases. In the design high water level, wharf忆s upper structure suffer the maximum wave force; the maximum uplift wave force and the maximum horizontal wave force do not appear simultaneously, there is a phase difference.

Abstract:The dynamic response of the piles under extreme waves is investigated according to the Codes of Harbor Hydrology( JTJ 213—1998)，we discrete the piles with FEM method and calculate the pile response considering the fluid-structure coupling effect in deep sea water environment. For further researching the pilesoil interaction, we carry out a comparative analysis with that under different pile-soil conditions. Results show that the pile-soil interaction has a great impact on the pile response in the open sea environment. The pile response under saturated soil has an error of 10% comparing with that under simplified impedence.

Abstract:There covers very thick soft clay in Zhujiang area. For a project of this area, the cement deep mixing method is used to improve the clayey ground. However, the soft clay is very thick and it is lack of experience, so we need to study the strength of cement mixing soil: after taking soil sample in situ, we start our test on the strength of cement mixing soil. Taking the cement amounts as 8%, 10%, 12%,14%,16% and 18% respectively, and water cement ratios as 0.9, 1.1 and 1.3, we analyze the strength of cement mixing soil at different ages. The results show that even under the condition of 18% cement amount and 0.9 water cement ratio, the strength of cement mixing soil at 90 d age is less than 1.0 MPa, which is lower than normal. After mixing fly ash and admixture of UNF-5, the strength of cement mixing soil is increased to 1.4 MPa.Therefore, admixtures must be mixed into the cement mixing soil to increase the active strength.

Abstract:Based on the model experiment and theoretical analysis， we discuss the mechanism of Karman vortex produced from the arc spur dike and the reason of scouring behind the spur dike, and discuss the relationship between the Karman vortex and the scouring behind the spur dike. The distribution of the scouring area and the deposition area behind the dam depends on the relationship between the velocity which is synthesized by the linear velocity on the edge of the Karman vortex and the approaching velocity of the flow and the starting velocity of the sediment behind the dam.

Abstract:In the process of mass concrete pouring, the hydration heat generates the temperature difference between the inside and outside of the concrete structure. If the temperature difference is too large, the temperature crack will be produced in the surface of the concrete structure, which is very adverse to the structure’s safety and stability. This paper analyzes part factors affecting the temperature field of the mass concrete during pouring by software ANSYS, which may serve as a reference for mass concrete pouring construction.

Abstract:Focusing on the soft foundation and adjacent first phase project restrictions of the second phase levee project of Baogang Majishan port, this paper conducts levee ground treatment and upper structure study, to probe in to the levee options selection, sand pile foundation treatment, confronting thick middle sand layer design and levee connection section design between different ground treatment methods.

Abstract:The value of Cm, the coefficient of hydrodynamic mass, has an important influence on the calculation of the impact energy of mooring ship in the beam sea. At present, there is a great difference among the values of Cm in current relative domestic and oversea documents, and the coefficient value in domestic water transportation industry standards is smaller, which is a hidden danger of building structures. Compared with the regulations on this value, and analyzing the results by referring to formulae and combining the engineering project, we know that the value of Cm in domestic current standards is obviously less than that appeared in other domestic and foreign codes and research reports. It is suggested that Cm for ships larger than 200 000 DWT should be increased to the value between 1.7 and 2.0.

Abstract:Design points of the trestle wharf includes: determination of rail top elevation for bridge crane；determination of the clearance height of track beam; study on the arrangement of guiding jetty; study on the berthing and operating width. This paper analyzes the design points and gives the design basis and calculation formula.

Abstract:Although ports in China have developed a lot, most services are still stuck in the traditional cargo transportation and handling, the logistics and service functions have not yet been fully expanded,and the requirements of economic and social development are still lagging behind. Based on the connotation of the transformation of port to the modern service industry, in view of the actual development of China’s ports, this paper puts forward recommendations for the port transformation to the modern service industry from aspects including enhancing and expanding logistics services, and accelerating the construction of the trade platform for bulk commodities.

Abstract:Finite element procedure ANSYS was used to analysis internal force of a pile-gravity type complex wharf under different load effect. Choosing two different ground-based models to simulate the interaction between caisson and foundation, the results show that Terminal structure internal forces is basically the same except some different in caisson bottom under Winkler foundation model and the model half-space foundation.The stress of the node which is in the location of piles and caissons connected is very large, so it is necessary to strengthen in this place.

Abstract:The multi-storey transfer stations have been widely used and played a more and more important role in port engineering with the development of port construction. Based on practical design and construction experience of port constructions, this paper focuses on the installation load, and searches for the reasonable load combination. The method of optimizing the transfer station structure is put forward based on the concept design, and the importance of embedded part in design and construction is emphasized.

Abstract:After the 12.5 m deep water channel of Yangtze estuary extends to Taicang, for making full use of Yangtze estuary deep channel regulation works, making better use of lower Yangtze River harbors and channels, and promoting the social and economic development of the Yangtze delta zone, it is in an urgent need to extend the deep water channel to Nanjing. The south Liu river reach is complex in natural condition, with combined influence by river discharge and tide, so it is necessary to assure the design lowest navigation water level in order to suitably and economically carry out the main channel regulations and exploitation of the middle and lower Yangtze River according to the present condition. For the river reaches without tide influence or with insignificant tide influence, the design lowest navigation water level should adopt the synthetic duration curve method, while for those with obvious tide influence, cumulative frequency as 90% of low tide levels should be adopted. The south Liu river reach is influenced by both tide and river discharge, thus further research is necessary to study the scope of applications of two methods.

Abstract:The branch of Baguazhou is a typical goose-head shape branch river, with the branch on the left and the main on the right. Main branch is in right. Recently, due to the scouring and siltation at the bar head and increasing development and utilization of the river bank, wharves along the river increas and the division ration of the left branch reduces gradually, which is closely related to the impact from the resistance by the wharfs’pile groups. This paper studies the accumulative influence of wharf忆s pile group on the division ration by a 2-D flow mathematic model. The result reveals that with the building up of wharves, the flow resistance increases and the division ratio of the left branch decreases remarkably.

Abstract:Shanghai-Nantong railway bridge locates at the middle of Chengtong river, a class I chanhnel.The deepwater channel plays an important role to the economy along the stream and the river regime varies due to the influence of Henggang sandbar and Tongzhou sandbar. Thus, the consideration of a variety of channel conditions and shipping transportation for the bridge pier allocation is compulsory. The maximum satisfaction for river transportation could be reached by optimizing bridge pier allocation based on considerations of hydrology,fluvial process, channel condition, shipping transportation, etc.

Abstract:Since the navigation environment is complex when large fleets passing the No.4 navigable bridge opening of Wuhan Yangtze River bridge during low-water season, a waterway regulation engineering is going to be performed. The numerical simulation of flow field is simulated and analyzed before and after the waterway regulation engineering, and the results are applied to computational analysis the width of actual navigable waters in the No.4 navigable bridge opening. Based on the numerical computation results, the waterway conditions, aperture of bridge piers, and results of flume tests, the width of actual navigable waters are calculated. Compared with the requirements of one way single navigation span in the instructions of the Navigation Standard of Inland Waterway (GB 50139—2004), the research results show that the flow condition and the width of actual navigable waters are adequate.

Abstract:It is a new navigation aids application technology based on AIS technology. During construction of intelligent waterway in the Yangtze River, virtual navigation aids, as an important supplement and improvement of real navigation aids, on one hand, can be used in temporary and rapidly setting navigation aids, marking special water area and optimizing the distribution of navigation aids in special reach based on its existing functions, on the other hand, can be expanded in functions due to its advantages of low cost, rapid installation and hinder navigation. The problems of constructing specific AIS telecommunication base station and network,coexistence of virtual and real navigation aids and changes of waterway management should be solved in the future development.

Abstract:Reclamation is carried out in the coastal area of Wenzhou through dredging sludge from the bottom of waterway in the sea, and large -area sludge ground is formed and then consolidated by vacuum preloading. The dredge fill ground which has been treated is urgent to be used for engineering construction. But its bearing capacity can’t meet the requirement of construction. In order to study the way of improving the bearing capacity, five test areas are designed for field tests. Modified vacuum preloading method without sand cushion is studied in different programs. According to the tests results, modified vacuum preloading method can achieve good results in the reinforcement of dredged fill soft ground. Consolidation effect can be better improved in the condition that horizontal drain pipes are encrypted or braced by PVC pipes inside. Modified vacuum preloading combined with surcharge preloading can protect the vacuum membrane and speed up the consolidation of the soft ground to an extent.

Abstract:During the reinforcement of the newly-filled or weak ground, the sealing trench is often used to seal the boundary. But, for the permeable and breathable soil, the application of sealing trench for the boundary sealing during large -area vacuum preloading treatment is neither economical nor effective. Considering the breathable soil, engineering cost and construction period, we adopt a new technology to seal the boundary by a combination of sealing trench in sections and clay sealing wall in the whole region. It’s shown that the technology possesses an obvious effect on the soft soil foundation and has achieved very good economic benefit.

Abstract:An axisymmetric analytical consolidation theory of soft ground under vacuum preloading combined with electro-osmosis is established by considering superposition of electric water seepage flow and pressure flow, the impact on vacuum loss induced by well resistance, the Hansbo’s sand drain foundation consolidation theory and vacuum combined with electro-osmosis boundary conditions. The analytical solutions for average excess pore pressure and radial average degree of consolidation are provided and varied. Finally, the effect of different load combinations on average excess pore pressure and radial average degree of consolidation is investigated by analysis of examples. The results show that the average excess pore pressure under vacuum preloading combined with electro-osmosis is the superposition of vacuum preloading and electro -osmosis respectively, the effect of soil reinforcement can be ensured through adjusting the voltage when the vacuum is insufficient, the better consolidation effect can be gained by higher supply voltage in the case of certain vacuum.

Abstract:In the offshore independent pier and abutment works, especially offshore wind farm fan-based independent high-pile piers, we must use steel pipe piles with great length, large diameter and good performance,so as to resist the great pulling force, big torque and shear stress. Considering the actual situation of Shanghai Donghai Bridge Offshore Wind Farm project pre-construction stage including great difficulty in construction and much single pile hammering, we start from the pile tip structure to seek for the more suitable structural types for offshore waters of Hangzhou bay, and thus improve the rate of pile driving.

Abstract:Model tests in soft rock pile foundation are carried out and the bearing characteristics of soft rock pile foundation of Funing port and their long-term effectiveness are mastered, which provide a basis for the engineering design. In the test of the bearing characteristics in soft rock pile foundations, it is the most critical for us to design the foundation model and the pile foundation model. The related parameters of materials are obtained by similar analysis, test planning and on-site sampling. The materials of the foundation model and the pile foundation model and their mix proportions are determined, which lay the foundation for the next test.

Abstract:The suction-cutter suction joint construction technology is a new type of dredging technique. The matching of capability is critical for guaranteeing the continuous construction and efficiency.Taking Huanghua port suction-cutter suction joint construction as a study case, we carried out an analysis of the matching of capability and achieved satisfactory effect in practical engineering.

Abstract:In order to investigate the real performance of the Reno mattress revetment used in many waterway treatment projects of the Yangtze River, we obtain the long-term performances of this system by investigating the Jiayu Swallows and Majiazui channel regulation projects. Meanwhile, we obtain the suitable vegetation types in the fluctuation zone of the Yangtze River waterway through the site vegetation tests.

Abstract:The high-pressure jet at draghead is recognized as the most important dredging machine for the modern dredging industry, and its hydraulic efficiency is more effective than mechanical efficiency, so the best way to improve the efficiency of dredging is to improve the design of high pressure jet at draghead. Based on the theoretical analysis and with the the test method of locale, we find the rumale of high-pressure water breaking ground depth and improve the design project and put forward the conception of high efficiency draghead design.