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A new elliptic-parabolic yield surface model revised by an adaptive criterion for granular soils

Science china(Technological Sciences) 2010年第8期53卷 2152-2159页

作者： LIU HanLong 1,2 ,XIAO Yang 1,2 ,LIU JinYuan 3 &LI GuoYing 4 1 Key Laboratory of Ministry of Education for Geomechanics and Embankment engineering,Hohai University, nanjing 210098,china 2 geotechnical research institute,Hohai University,nanjing 210098,china 3department of Civil engineering,Ryerson University,Toronto,Canada 4 department of geotechnical engineering,nanjing hydraulic research institute,nanjing 210014,china Key Laboratory of Ministry of Education for Geomechanics and Embankment engineering Hohai University Nanjing China geotechnical research institute Hohai University Nanjing China department of Civil engineering Ryerson University Toronto Canada department of geotechnical engineering Nanjing Hydraulic Research Institute Nanjing China

An adaptive criterion for shear yielding as well as shear failure of soils is proposed in this paper to address the fact that most criteria,including the Mohr-Coulomb criterion,the Lade criterion and the Matsuoka-Nakai criterion,cannot agree well with the experimental results when the value of the intermediate principal stress parameter is too *** new criterion can adjust an adaptive parameter based on the experimental results in order to make the theoretical calculations fit the test results more *** original elliptic-parabolic yield surface model can capture both soil contraction and dilation ***,it normally over-predicts the soil strength due to its application of the Extended Mises criterion.A new elliptic-parabolic yield surface mode is presented in this paper,which introduces the adaptive criterion in three-dimensional principal stress *** new model can well model the stress-strain behavior of soils under general stress *** to the original model which can only simulate soil behavior under triaxial compression conditions,the new model can simulate soil behaviors under both triaxial compression conditions and general stress conditions.

关键词： principal stress space intermediate principal stress yield surface failure criterion constitutive model

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Experimental Study on Superficial Sliding of a New Type of Offshore Platform

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china Ocean engineering 1996年第1期11卷 121-128页

作者： Wang Zhaojing Zhang Ling Senior Engineer, geotechnical engineering department, nanjing hydraulic research institute, nanjing 210024 Engineer, geotechnical engineering department, nanjing hydraulic research institute, nanjing 210024 geotechnical engineering department Nanjing Hydraulic Research Institute Nanjing 210024

In order to verify the theoretical design and computation of a new type of platform, laboratory model test of the superficial sliding of the platform is carried out. Test results show that the requirement for the stability of the platform can be satisfied, and the API-82 criterion can be met. It is also suggested that, in order to enhance the stability of the platform, a buried- pad with porous holes and a long apron-board should be adopted in the design of the new type of platform.

关键词： superficial sliding model test offshore platform

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RECIRCULATING FLOW IN SHALLOW OPEN CHANNEL via THE RNG κ-ε MODEL

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Journal of Hydrodynamics 1999年第1期11卷 41-49页

作者： Kuang Cui-ping (department of River & Harbour engineering, nanjing hydraulic research institute, nanjing 210024, P. R. china ) nanjing hydraulic research Inst Nanjing China

The steady recirculating flow behind a sudden expansion in a shallow channel is studied using the renormalization group (RNG) κ-ε model. The predicted recirculating flow and the reattachment length of the recirculating flow are well-supported by the reported experimental data. The computed effective viscosity, turbulence kinetic energy and its dissipation rate given by the RNG κ-ε model are smaller than that by the standard κ-ε model, while the reattachment length of the recirculating flow is larger. The RNG κ-ε medel overcomes the shortcoming of underpredicting the length of the recirculation zone by the standard κ-ε model.

关键词： open channel RNG κ-ε recirculating flow

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The Importance of Computational Grids in hydraulic Numerical Models

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china Ocean engineering 1997年第3期12卷 335-346页

作者： Kuang Cuiping Ph. Doctor, Senior Engineer, River and Harbour engineering department, nanjing hydraulic research institute, nanjing 210024 River and Harbour Eng. department Nanjing Hydraulic Research Institute Nanjing 210024 China

The importance of computational grids in hydraulic numerical models is studied by numerical simulation of jet flow in a rectangular duct which is linked with a fixed width inlet and a different width outlet using a standard k-epsilon turbulence model. The computational results show the numerical solutions may not be reasonable because of the incorrect computational grid and each numerical model bass grid-independent solution. The computational grid has a definitive effect on the accuracy and stability of the computational solution, which must be divided well according to the simulated geometry and physical characters of hydraulic problems. The main guidelines about the formation of computational grid in such aspects as node distribution, smoothness and skewness of grid, have been given.

关键词： kappa-epsilon turbulence model grid node distribution smoothness and skewness of grid grid aspect ratio

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Experimental Study on Rectangular Floating Breakwaters

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china Ocean engineering 1993年第3期8卷 323-332页

作者： Yao Guoquan Ma Zhixiong Ding Bingcan Prof. Senior Engineer, River and Harbour department, nanjing hydraulic research institute, nanjing 210024 Senior Engineer, River and Harbour department, nanjing hydraulic research institute, nanjing 210024 Engineer, River and Harbour department, nanjing hydraulic research institute, nanjing 210024 nanjing hydraulic research Inst Nanjing China

This paper proposes ten types of improved floating breakwaters for experiment with regular waves, based on the experience in the development and manufacture of existing floating breakwaters both at home and abroad, and on the results of experimental studies on the hydraulic characteristics of several types of floating breakwaters. The wave heights before and behind the breakwaters are measured, the movements of floating breakwaters are observed and the chain forces of the floating breakwaters are measured. The paper studies and compares the hydraulic characteristics of the improved rectangular floating breakwaters of which the internal and external structures and their installation methods are changed. Finally the optimal type of structure is selected through experiments.

关键词： floating breakwater experimental study wave dissipation hydraulic characteristics

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Dynamic Analysis for Structures Isolated with Dampers

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china Ocean engineering 1996年第3期11卷 269-280页

作者： Gu Peiying and Gao Ming M. Sc, Engineer, Material and Structure department, nanjing hydraulic research institute, nanjing 210024 Professor, Material and Structure department, nanjing hydraulic research institute, nanjing 210024 Material and Structure department Nanjing Hydraulic Research Institute Nanjing 210024

In this paper, mathematical models and dynamic analyses for both SDOF and MDOF structures isolated with dampers are established and performed, and a comprehensive computation method is provided. The shock absorbing effect is illustrated through an example of a two DOF damper-isolated system excited by sinusoidal waves and actual ground acceleration input recorded in earthquakes. It is shown that most of the responses of the structure with dampers reduce greatly near the resonant zone, but acceleration is enlarged in the lower or higher frequency zone; among various parameters, the influence of frictional coefficient n is the most significant, that of damping ratio of the dampers , is the second, and that of stiffness coefficient of the dampers k, is the slightest.

关键词： shock absorbing structure isolated with dampers shock absorbing effect dynamic analysis parametric analysis

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Influence of Approach Channel on Wave Propagation with Varying Incident Angles

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china Ocean engineering 1996年第3期11卷 323-331页

作者： Zuo Qihua and Yang Zhengji . Senior Engieer, River and Harbour department, nanjing hydraulic research institute, nanjing 210029 River and Harbour department Nanjing Hydraulic Research Institute Nanjing 210029

The variation of the amplitude of waves with varying incident angles when waves propagate through a typical approach channel is discussed by a numerical calculation method, the result of which shows that the influence of the channel on wave propagation is obvious. When the wave propagation direction is in coincidence with the channel axis, the wave amplitude ratio will decrease with the increase of propagation distance. When the incident angle is 15 - 30 , there appears an area of larger wave amplitude ratio on the side slope facing the waves, but at the another side, the wave amplitude ratio is generally small, indicating that the channel has a shielding effect. When waves propagate across the channel perpendicularly, the wave amplitude ratio can be calculated with the shallow water coefficient.

关键词： approach channel water wave varying incident angles numerical computation

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Computational Techniques of 2D Tidal Flow in Estuaries and Bays

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china Ocean engineering 1995年第4期10卷 395-404页

作者： Xin Wenjie Senior Engineer, River and Harbour department, nanjing hydraulic research institute, nanjing 210024

Some problems in the numerical calculation of tidal flow in estuaries and bays, such as distribution bed roughness, relationship between model moving boundary and water volume balance, remedy of certain shortage under open boundary conditions, smooth transfer of the controlling message for the inner boundaries of nested model, can not be solved usually by means of the fundamental equations and computing mode adopted in the numerical model, but can be done by the measures which not only satisfy the physical features but also are convenient for operation. Based on the calculated samples of some areas of Modaomen, Lingdingyang and Huangmaohai of the Pearl River Estuary, and Shuidong Bay (a typical barrier- lagoon tidal channel) in Guangdong Province, method and process of calculation for the above mentioned problems are briefly presented in this paper.

关键词： numerical model bed roughness moving boundary problems open boundary nested model

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3D mathematical model for suspended load transport by turbulent flows and its applications

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Science china(Technological Sciences) 2004年第2期47卷 237-256页

作者： LU Yongjun1,DOU Guoren1,HAN Longxi2,SHAO Xuejun3 & YANG Xianghua1,3 1.nanjing hydraulic research institute,nanjing 210029,china 2.College of Environmental engineering of Hohai University,nanjing 210098,china 3.department of hydraulic engineering,Tsinghua University,Beijing 100084,china nanjing hydraulic research institute Nanjing China College of Environmental engineering of Hohai University Nanjing China department of hydraulic engineering Tsinghua University Beijing China

This paper presents a 3D mathematical model for suspended load transport in turbulent flows. Based on Dous stochastic theory of turbulent flow, numerical schemes of Reynolds stresses for anisotropic turbulent flows were obtained. A refined wall function was employed to treat solid wall boundaries. The equations for 2D suspended load motion and sorting of bed material have been expanded into 3D cases. Numerical results are validated by the measured data of the Gezhouba Project, and proved to be in good agreement with the experimental. The present method has been employed to simulate sediment erosion and deposition in the dam area of Three Gorges Project, and for the operation of the project, siltation process and deposition pattern in the near-dam area of the reservoir, size distribution of the deposits and bed material, and flow fields and sediment concentration fields at different time and elevations are predicted. The predicted results are close to the experimental observations in physical model studies. Thus, a new method is established for 3D simulation of sediment motion in dam areas of multi-purpose water projects.

关键词： turbulent flows, Dou's stochastic theory, nonuniform suspended load, riverbed erosion and deposition, 3D mathematical model, Three Gorges Project.

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Experimental Study of Perforated Caisson Breakwater

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china Ocean engineering 1992年第1期7卷 65-78页

作者： Wang Jianyi Senior Engineer, River and Harbour department, nanjing hydraulic research institute, nanjing

This paper describes the design of a perforated caisson breakwater and presents the results of model test. Tests with regular and irregular waves have demonstrated that the perforated caisson breakwater has the advantages of low reflection coefficient, good wave-absorbing performance, relatively small wave height in front of the breakwater, and small amount of overtopping. Analyses have been made of the coefficient of reflection, wave height in front of the breakwater, and wave overtopping. Relevant figures and tables are presented for reference.

关键词： perforated caisson breakwater quay model test wave reflection

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