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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 2.0098,{2. 2.geotechnical Research institute,hohai university,nanjing 2.0098,{2. 3Department of Civil Engineering,Ryerson university,Toronto,Canada 4 Department of geotechnical Engineering,nanjing Hydraulic Research institute,nanjing 2.0014,{2. 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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Dilatancy equation of rockfill material under the true triaxial stress condition

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Science china(Technological Sciences) 2011年第S1期54卷 175-184页

作者： XIAO Yang 1,2.LIU HanLong 1,2.ZHU JunGao 1,2.& SHI WeiCheng 1,3 1 Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,hohai university,nanjing 2.0098,{2. 2.geotechnical Research institute,hohai university,nanjing 2.0098,{2. 3 School of Civil Engineering and Architecture,Changzhou institute of Technology,Changzhou 2.3002.{2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University Nanjing China geotechnical Research institute Hohai University Nanjing China School of Civil Engineering and Architecture Changzhou Institute of Technology Changzhou China

Rockfill material is widely used for construction of high rockfill dam due to its facility,economical cost,high strength and effective aseismatic *** is provoked profoundly to propose a suitable constitutive model for a better application of this *** dilatancy equation of rockfill material plays a significant role in the constitutive *** the sake of simplicity,a dilatancy equation is established by the linear least square method on the basis of the rearranged data of rockfill material in the true triaxial *** on the fact that the rearranged data at different initial confining pressures are aligned in a narrow band,the dilatancy behavior of rockfill material is independent of the initial confining ***,different from the initial confining pressure,both the intermediate principal stress ratio and the specimen density exhibit a remarkable influence on the dilatancy behaviors of rockfill ***,the predictions of the proposed dilatancy equation are in a good agreement with the rearranged test data of rockfill material at different specimen densities and stress paths.

关键词： rockfill material dilatancy equation true triaxial test density stress path initial confining pressure

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Research on stability of the accumulated rock-soil body of reservoir bank under rainfall condition

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Science china(Technological Sciences) 2009年第9期52卷 2528-2535页

作者： GU ChongShi1,2.WU HaiZhen1,2.& SU HuaiZhi1,2.1 College of Water Resources and Hydropower Engineering,hohai university,nanjing 2.0098,{2. 2.National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety,hohai university,nanjing 2.0098,{2. 3 Jiangxi Water Conservancy Research institute,Nanchang 33002.,{2. College of Water Resources and Hydropower Engineering Hohai University Nanjing China National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety Hohai University Nanjing China Jiangxi Water Conservancy Research institute Nanchang China

The shear strength parameters property of rock-soil aggregates in embankment slope of reservoir,that is,the relationship between cohesion and gravel content,between friction angle and gravel content,and the relationship between cohesion and water content,between friction angle and water content,is studied based on the direct shear test results,the shear strength change law of the rock-soil aggregates is given,and the unsaturated shear strength formulation of rock-soil aggregates that could consider suction and saturation degree influence is put forward in this paper,through which the sliding or failure physical mechanism of this type of slope under the condition of rainfall infiltration is studied. Also the 3D unsteady saturated-unsaturated seepage field and its FEM resolving mode are established based on the analysis of the slope rainfall infiltration process. Case study with this method indicates that the minimum safety factor of the accumulated rock-soil aggregates dose not arrive at the moment of rainfall cessation,but appears several hours after the rainfall cessation,this phenomenon is in accordance with the practical slope engineering's failure process and could explain appropriately the slope failure caused by rainfall infiltration. Research results in this paper have an important reference value for the research on stability of the accumulated rock-soil aggregates in embankment slope of reservoir,and can enrich the stability analysis method and relevant theory of reservoir embankment slope.

关键词： reservoir bank slope rock-soil aggregates rainfall infiltration saturated/unsaturated seepage

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Scattering of SH waves induced by a symmetrical V-shaped canyon: a unified analytical solution

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Earthquake Engineering and Engineering Vibration 2012年第4期11卷 445-460页

作者： Zhang Ning Gao Yufeng Li Dayong Wu Yongxin Zhang Fei geotechnical Research institute Hohai University Key Laboratory of Geomechanics and Embankment Engineering(hohai university) Ministry of Education College of Civil Engineering&Architecture Shandong University of Science and Technology

This paper reports a series solution of wave functions for two-dimensional scattering and diffraction of plane SH waves induced by a symmetrical V-shaped canyon with different shape ratios. A half-space with a symmetrical V-shaped canyon is divided into two sub-regions by using a circular-arc auxiliary boundary. The two sub-regions are represented by global and local cylindrical coordinate systems, respectively. In each coordinate system, the wave field satisfying the Helmholtz equation is represented by the separation of variables method, in terms of the series of both Bessel functions and Hankel functions with unknown complex coefficients. Then, the two wave fields are described in the local coordinate system using the Graf addition theorem. Finally, the unknown coefficients are sought by satisfying the continuity conditions of the auxiliary boundary. To consider the phase characteristics of the wave scattering, a parametric analysis is carried out in the time domain by assuming an incident signal of the Ricker type. Surface and subsurface transient responses demonstrate the characteristics and mechanisms of wave propagating and scattering.

关键词： SH-wave scattering V-shaped canyon topographic effect wave propagation earthquake ground motion wave function expansion method

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Dragload and Downdrag Performances of Inclined Pile Group Embedded in Consolidating Soil

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Transactions of Tianjin university 2011年第3期17卷 175-180页

作者：孔纲强杨庆 Key Laboratory for Geomechanics and Embankment Engineering of Ministry of Education Geotechnical Research Institute Hohai University State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology

The performance of inclined pile group embedded in consolidating soil under surcharge load was investigated by experiment in comparison with vertical pile group and single pile under the same conditions; dragload, downdrag, and layered soil settlement were measured. A three-dimensional numerical model was built via FLAC3D software, and verified by the experimental results. Influence factors, such as consolidation time, pile spacing, and pile tilt angle were analyzed. The results show that dragload of inclined pile group increases with the increase of consolidation time and pile spacing or the decrease of pile tilt angle. Downdrag of inclined pile group increases with the increase of consolidation time, pile spacing and pile tilt angle.

关键词： pile group negative skin friction consolidating soil downdrag dragload neutral plane

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Real-Time Warning System of Regional Landslides Supported by WEGISB and Its Application in Typhoon Rananim,Zhejiang Province,china

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地学前缘 2009年第S1期16卷 68-69页

作者： Guirong Zhang~1,Kunlong Yin~2.Lixia Chen~2.1.geotechnical Engineering institute of {2. Hydraulic Research institute,{2. 2.0036,china. 2.china university of Geosciences(Beijing),Beijing 100083,china

As one of the provinces of highest economic growth in coastal china,Zhejiang Province is experiencing serious geological disasters during the past development of *** main kinds of geo-hazards include landslides,rock falls and debris-flows in Zhejiang Province,which are mainly induced by intensive rainfall during typhoon season or by long-term rainfall from May to June every ***,

关键词： landslide prediction real-time warning effective rainfall rainfall intensity WEBGIS typhoon

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Study on mechanical parameters of fractured rock masses

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Science china(Technological Sciences) 2011年第S1期54卷 140-146页

作者： CHEN WeiZhong 1,2.YANG JianPing 1,TAN XianJun 1 &YU HongDan 1 1 State Key Laboratory of Geomechanics and geotechnical Engineering,institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,{2. 2.Research Center of geotechnical and Structural Engineering,Shandong university,Jinan 2.0061,{2. State Key Laboratory of Geomechanics and geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan China Research Center of geotechnical and Structural Engineering Shandong University Jinan China

The equivalent strength parameters of fractured rock masses are prerequisite for stability analysis of geotechnical engineering projects constructed in fractured rock masses which are encountered frequently in western *** on generated mesh of fractured rock masses,combined with statistic damage constitutive model of intact rock and damage model of structural plane,progressive failure of fractured rock masses is studied using finite element method(FEM) .Furthermore,Scale effect and anisotropy of compressive strength of fractured rock masses are *** results show that the strength decreases and tend towards stability rapidly from intact rock to fractured rock masses,and the anisotropy of strength of fractured rock masses is not *** last,based on numerical simulation conducted on 10 m scale rock masses under different confining pressures,the equivalent strength parameters of fractured rock masses are gained and the results are compared with Hoek-Brown *** method developed is helpful for determination of strength parameters of fractured rock masses.

关键词： rock mechanics fractured rock masses equivalent strength parameters finite element method scale effect anisotropy

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Unified solutions for stresses and displacements around circular tunnels using the Unified Strength Theory

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Science china(Technological Sciences) 2010年第6期53卷 1694-1699页

作者： ZHANG ChangGuang1,WANG JiangFeng2.& ZHAO JunHai3 1 Department of geotechnical Engineering,Tongji university,Shanghai 2.0092.{2. 2.North {2. institute of Water Conservancy and Hydroelectric Power,Zhengzhou 450011,{2. 3 School of Civil Engineering,Chang’an university,Xi’an 710061,{2. Department of geotechnical Engineering Tongji University Shanghai China North china institute of Water Conservancy and Hydroelectric Power Zhengzhou China School of Civil Engineering Chang’an University Xi’an China

The unified solutions are presented for stresses and displacements around a circular tunnel subjected to a hydrostatic stress *** rock mass is assumed to be elastic-brittle-plastic and governed by the Unified Strength *** displacements are obtained accounting for three different definitions for elastic strains and different Young's modulus in the plastic *** unified solutions obtained in this paper are especially versatile in reflecting the intermediate principal stress effect to different extents for different *** conventional solutions,based on the Mohr-Coulomb failure criterion and the Generalized Twin Shear Stress yield criterion,are special cases of the present unified *** new unified solutions can compare with those computed by the latest generalized Hoek-Brown failure *** results obtained demonstrate the importance of the intermediate principal stress influence for the stresses and displacements *** effects of different definitions for elastic strains and different Young's modulus in the plastic zone on the displacements are significant.

关键词： Unified Strength Theory intermediate principal stress different definitions for elastic strains different Young’s modulus

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Virtual multi-dimensional internal bonds model and its application in simulation of rock mass

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Science china(Technological Sciences) 2008年第2期51卷 192-201页

作者： ZHANG ZhenNan1,2.& GE XiuRun3,4 1 Department of Civil Engineering,Shanghai university,Shanghai 2.0072.china 2.Shanghai {2. of Applied Mathematics and Mechanics,Shanghai university,Shanghai 2.0072. china 3 {2. of geotechnical Engineering,Shanghai Jiao Tong university,Shanghai 2.0030,china 4 {2. of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,china Department of Civil Engineering Shanghai University Shanghai China Shanghai institute of Applied Mathematics and Mechanics Shanghai University Shanghai China institute of geotechnical Engineering Shanghai Jiao Tong University Shanghai China institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan China

VMIB (virtual multi-dimensional internal bonds) is a multiscale mechanical model developed from the VIB (virtual internal bond) theory. In VIB theory,the solid mate-rial is considered to consist of random-distributed material particles in microscale. These particles are connected with normal bonds. The macro constitutive relation is derived from the cohesive law between particles. However,in VMIB,the micro particles are connected with both normal and shear bonds. The macro constitutive relation is derived in terms of bond stiffness coefficients. It has been theoretically certified that there exists a corresponding relationship between the two bond stiffness coefficients and the two macro material constants,i.e. the Young’s modulus and Poisson ratio. This corresponding relationship suggests that it should be necessary and sufficient to simultaneously account for the normal and shear interactions between particles. Due to the fact that the fracture criterion is directly incorporated into the constitutive relation,both VIB and VMIB present many advantages in simulating fractures of materials. In the damage model of rock mass,a damage tensor is usually defined to describe the distribution of cracks. The damage value in one direction determines the relative stiffness of rock mass in this direction. In VMIB solid,the relative distribution density of micro bonds in one direction determines the relative macro stiffness of the material in this direction. The effects of the damage value and the relative distribution density of bonds are consistent. To simulate the failure behavior of rock mass with VMIB,the presented paper sets up a quantitative relationship between the damage tensor and the rela-tive distribution density of bonds. Comparison of the theoretical and the experi-mental results shows that VMIB model can represent the effect of distributed cracks on rock mass with this relationship. The presented work provides a founda-tion for further simulating fracture behavior

关键词： VMIB (virtual multi-dimensional internal bonds) rock mass VIB (virtual internal bonds) multi-cracked body numerical simulation

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3D thermo-hydro-mechanical-migratory coupling model and FEM analyses for dual-porosity medium

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Science china(Technological Sciences) 2010年第8期53卷 2172-2182页

作者： ZHANG YuJun 1&ZHANG WeiQing 2.1 State Key Laboratory of Geomechanics and geotechnical Engineering,institute of Rock and Soil Mechanics, Chinese Academy of Sciences,Wuhan 430071,{2. 2.chool of Civil Engineering,Southwest Jiaotong university,Chengdu 610031,{2. State Key Laboratory of Geomechanics and geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan China School of Civil Engineering Southwest Jiaotong University Chengdu China

One kind of 3D coupled thermo-hydro-mechanical-migratory model for saturated-unsaturated dual-porosity medium was established,in which the stress field and the temperature field are single,but the seepage field and the concentration field are double,and the influences of sets,spaces,angles,continuity ratios,stiffness of fractures on the constitutive relationship of the medium can be *** relative three-dimensional program of finite element method was also *** comparing with the existing computation example,reliability of the model and the program were *** a hypothetical nuclear waste repository as a calculation example,the radioactive nuclide leak was simulated numerically with both the rock mass and the buffer being unsaturated media,and the temperatures,negative pore pressures,flow velocities,nuclide concentrations and normal stresses in the rock mass were *** results showed that the temperatures,negative pore pressures and nuclide concentrations in the buffer all present nonlinear changes and distributions that even though the saturation degree in porosity is only about 1/9 of that in fracture,the flow velocity of underground water in fracture is about 6 times of that in porosity because the permeability coefficient of fracture is almost four orders higher than that of porosity,and that the regions of stress concentration occur at the vicinity of two sides of the boundary between buffer and disposal pit wall.

关键词： dual-porosity medium thermo-hydro-mechanical-migratory coupling three-dimensional model FEM analysis

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