MICROMECHANICAL MODELLING OF PHASE TRANSFORMATION BEHAVIOUR OF A TRANSITIONAL SOIL  

作　　者：Chuang Yu Zhenyu Yin Dongmei Zhang 

机构地区：[1]College of Architecture and Civil Engineering, Wenzhou University [2]LUNAM University, Ecole Centrale de Nantes, UMR CNRS GeM, Nantes, France [3]Department of Geotechnical Engineering, College of Civil Engineering, Tongji University

出　　处：《Acta Mechanica Solida Sinica》2014年第3期259-275,共17页固体力学学报（英文版）

基　　金：supported by the Research Fund for the Doctoral Program of Higher Education of China(No.20110073120012);the Shanghai Pujiang Talent Plan(No.11PJ1405700);the National Natural Science Foundation of China(Nos.41240024,41372285 and 41372264);the Zhejiang Provincial Natural Science Foundation of China(No.1LY13E080013);the NSFC/ANR Joint Research Scheme(Nos.51161130523 and RISMOGEO)

摘　　要：Experiments show that silts and silty soils exhibit contraction followed by dilation during shearing and the slope of failure line decreases at large strains, termed as phase transformation behaviour. This paper is to develop a new micromechanical stress-strain model that accounts for the phase transformation behaviour by explicitly employing the phase transformation line and its related friction angles. The overall strain includes plastic sliding and plastic compression among grains. The internal-friction angle at the phase transformation state and the void state variable are employed to describe the phase transformation behaviour. The model is examined by simulating undrained and drained triaxial compression tests performed on Pitea silts. The local stress-strain behaviour for contact planes is also investigated.Experiments show that silts and silty soils exhibit contraction followed by dilation during shearing and the slope of failure line decreases at large strains, termed as phase transformation behaviour. This paper is to develop a new micromechanical stress-strain model that accounts for the phase transformation behaviour by explicitly employing the phase transformation line and its related friction angles. The overall strain includes plastic sliding and plastic compression among grains. The internal-friction angle at the phase transformation state and the void state variable are employed to describe the phase transformation behaviour. The model is examined by simulating undrained and drained triaxial compression tests performed on Pitea silts. The local stress-strain behaviour for contact planes is also investigated.

关 键 词：MICROMECHANICS SILTS constitutive models elastoplasticity ANISOTROPY simulation 

分 类 号：TU43[建筑科学—岩土工程]