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Micromechanical analysis of the behavior of stiffclay

Acta Mechanica Sinica 2011年第6期27卷 1013-1022页

作者： Zhen-Yu Yin Ching S. Chang Pierre-Yves Hicher Jian-Hua Wang Department of Civil Engineering Shanghai Jiao Tong University 200240 Shanghai China Department of Civil and Environmental Engineering University of Massachusetts Amherst MA 01002 USA Research Institute in Civil and Mechanical Engineering UMR CNRS 6183 Ecole Centrale de Nantes BP 92101 44321 Nantes France

Cementations formed in geological timescale are observed in various stiff clays.A micromechanical stress strain model is developed for modeling the effect of cementation on the deformation behavior of stiff *** proposed approach considers explicitly cementations at intercluster contacts,which is different from conventional *** concept of inter-cluster bonding is introduced to account for an additional cohesion in shear sliding and a higher yield stress in normal compression.A damage law for inter-cluster bonding is proposed at cluster contacts for the debonding process during mechanical *** model is used to simulate numerous stress-path tests on Vallericca stiff *** applicability of the present model is evaluated through comparisons between the predicted and the measured *** order to explain the stress-induced anisotropy arising from externally applied load,the evolution of local stresses and local strains at inter-cluster planes are discussed.

关键词： Stiff clay destructuration Micromechanics Plasticity Induced anisotropy

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A one-dimensional strain-rate based model for soft structured clays

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Science China(Technological Sciences) 2012年第1期55卷 90-100页

作者： YIN ZhenYu WANG JianHua Center for Marine Geotechnics Research Department of Civil Engineering Shanghai Jiao Tong University Shanghai 200240 China

The paper aims to investigate the destructuration effect on the time-dependent behaviour of soft structured *** coupled with destructuration is analysed based on experimental observations.A strain-rate based model is developed to de-scribe the mechanical behaviour for both unstructured and structured clays under one-dimensional *** advantage of the proposed model lies in the determination of model parameters in a straightforward way,which leads to an easy use of the model for practical *** with consolidation,the model is used to simulate oedometer tests at constant rate of strain and long-term creep oedometer tests on two structured *** comparisons between predicted and measured results demonstrate that the proposed model can reasonably describe the effect of destructuration on the time-dependent behaviour of soft structured clay under one-dimensional *** the model is proposed for one-dimensional analysis,it can be a good base for developing a more general 3D model.

关键词：结构化的泥土 viscoplasticity 巩固爬紧张率 destructuration

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