Microstructural modelling of stress-dependent behaviour of clay

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:46

Article

Yin, Zhen-Yu¹  Chang, Ching S.¹ 

[1] Univ Massachusetts, Dept Civil & Environm Engn, Amherst, MA 01002 USA

关键词: Anisotropy;    Clays;    Micromechanics;    Constitutive relations;    Plasticity;    Stress reversal;   

DOI  :  10.1016/j.ijsolstr.2008.11.006

来源: Elsevier

【 摘 要 】

The purpose of this paper is to investigate the stress-dependent behaviour of clay during drained and undrained shearing by means of a micromechanical approach. A new micromechanical stress-strain model is developed for clay using the approach developed in earlier studies by Chang and Hicher [Chang, C.S., Hicher, P.Y., 2005. An elastic-plastic model for granular materials with microstructural consideration. International journal of Solids and Structures 42(14), 4258-4277]. In order to model the extension test on a K(0) consolidated sample. a formulation is developed to account for the stress reversal on a contact plane. The model is then used to simulate numerous stress-path tests on Lower Cromer Till and kaolin clay, including triaxial compression and extension tests, under both undrained and drained conditions, with different K(0) consolidation, and different over-consolidation ratios. The applicability of the present model is evaluated through comparisons between the predicted and the measured results. The evolution of local stresses and local strains at inter-particle planes are discussed in order to explain the stress-induced anisotropy due to externally applied load. All simulations have demonstrated that the proposed micromechanical approach is capable of modelling the stress-induced anisotropy and other major features of the complex behaviour in clay. (C) 2008 Elsevier Ltd. All rights reserved.

【 授权许可】

Free