Return mapping algorithm for an enhanced generalized plasticity constitutive model of partially saturated soils

作     者：Zhang, H. W. Santagiuliana, R. Schrefler, B. A. 

作者机构：Univ Padua Dept Civil Environm & Architectural Engn I-35131 Padua Italy Dalian Univ Technol Dept Engn Mech Res Inst Engn Mech State Key Lab Struct Anal & Ind Equipment Dalian 116024 Peoples R China 

出 版 物：《COMPUTERS AND GEOTECHNICS》 (计算机与土工学)

年 卷 期：2012年第45卷

页      面：53-61页

核心收录：

学科分类：0709[理学-地质学] 081803[工学-地质工程] 07[理学] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：National Natural Science Foundation [10225212, 50178016] State Educational Committee of China Progetto Strategico di Ateneo, AACSE - Algorithms and Architectures for Computational Science and Engineering [STPD08JA32] 

主　　题：Generalized plasticity Implicit integration algorithm Return mapping algorithm Consistent tangent stiffness matrix Partially saturated soils 

摘      要：The objective of this paper is to investigate the stress update algorithm and the tangent operator for an enhanced generalized plasticity model developed recently for partially saturated soils, where on top of the hydrostatic and deviatoric components of the (effective) stress tensor suction has to be considered as an independent variable. The soil model used for the applications can be derived from a potential energy function and is thermodynamically consistent. The Galerkin method is used to obtain a weak form of the governing equations and a stress-suction coupling matrix is derived in the discretization in space by finite element method. The implicit integration algorithm is incorporated in a code for partially saturated soil dynamics. The framework of generalized plasticity is presented and examples are shown including subsidence above a model gas reservoir. (C) 2012 Elsevier Ltd. All rights reserved.