New double yield surface model for coarse granular materials incorporating nonlinear unified failure criterion  

作　　者：刘萌成 刘汉龙 高玉峰 

机构地区：[1]State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering(Hohai University) [2]College of Architecture and Civil Engineering,Zhejiang University of Technology

出　　处：《Journal of Central South University》2012年第11期3236-3243,共8页中南大学学报（英文版）

基　　金：Project(50825901)supported by the National Natural Science Foundation for Distinguished Young Scholar of China;Project(2009492011)supported by State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing Hydraulic Research Institute,China;Project(GH200903)supported by Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering(Hohai University),China;Project(Y1090151)supported by Natural Science Foundation of Zhejiang Province,China

摘　　要：A new double-yield-sarface （DYS） model was developed to characterize the strength and deformation behaviors of coarse granular materials （CGMs）. Two kinds of deformation mechanisms, including the shear and compressive plastic deformation, were taken into account in this model, These two deformation mechanisms were described by the shear and compressive yield functions, respectively. The Lode angle dependent formulations of proposed model were deduced by incorporating a 3D nonlinear unified failure criterion. Some comparisons were presented between the numerical predictions of proposed model and test data of true triaxial tests on the modeled rockfills. The model predictions are in good agreement with the test data and capture the strain hardening and plastic volumetric dilation of CGMs. These findings verify the reasonability of current DYS model, and indicate that this model is well suited to reproduce the stress-strain-volume change behavior of CGMs in general.A new double-yield-surface (DYS) model was developed to characterize the strength and deformation behaviors of coarse granular materials (CGMs).Two kinds of deformation mechanisms,including the shear and compressive plastic deformation,were taken into account in this model.These two deformation mechanisms were described by the shear and compressive yield functions,respectively.The Lode angle dependent formulations of proposed model were deduced by incorporating a 3D nonlinear unified failure criterion.Some comparisons were presented between the numerical predictions of proposed model and test data of true triaxial tests on the modeled rockfills.The model predictions are in good agreement with the test data and capture the strain hardening and plastic volumetric dilation of CGMs.These findings verify the reasonability of current DYS model,and indicate that this model is well suited to reproduce the stress-strain-volume change behavior of CGMs in general.

关 键 词：constitutive model coarse granular material failure criterion DILATANCY yield surface 

分 类 号：TV41[水利工程—水工结构工程]