Constitutive model for overconsolidated clays  

作　　者：YAO YangPing HOU Wei ZHOU AnNan 

机构地区：[1]Department of Civil Engineering,Beihang University,Beijing 100083,China

出　　处：《Science China(Technological Sciences)》2008年第2期179-191,共13页中国科学（技术科学英文版）

基　　金：the National Natural Science Foundation of China (Grant Nos. 50479001 and 10672010);the National Science and Technology Supporting Item (Grant No. 2006BAK12B12);the National Basic Research Program of China (Grant No. 2007CB714203)

摘　　要：Based on the relationships between the Hvorslev envelope,the current yield sur-face and the reference yield surface,a new constitutive model for overconsolidated clays is proposed. It adopts the unified hardening parameter,to which the potential failure stress ratio and the characteristic state stress ratio are introduced. The model can describe many characteristics of overconsolidated clays,including stress-strain relationships,strain hardening and softening,stress dilatancy,and stress path dependency. Compared with the Cam-clay model,the model only re-quires one additional soil parameter which is the slope of the Hvorslev envelope. Comparisons with data from triaxial drained compression tests for Fujinomori clay show that the proposed model can rationally describe overconsolidated properties. In addition,the model is also used to predict the stress-strain relationship in the isotropic consolidation condition and the stress paths in the undrained triaxial compression tests.Based on the relationships between the Hvorslev envelope, the current yield surface and the reference yield surface, a new constitutive model for overconsolidated clays is proposed. It adopts the unified hardening parameter, to which the potential failure stress ratio and the characteristic state stress ratio are introduced. The model can describe many characteristics of overconsolidated clays, including stress-strain relationships, strain hardening and softening, stress dilatancy, and stress path dependency. Compared with the Cam-clay model, the model only requires one additional soil parameter which is the slope of the Hvorslev envelope. Comparisons with data from triaxial drained compression tests for Fujinomori clay show that the proposed model can rationally describe overconsolidated properties. In addition, the model is also used to predict the stress-strain relationship in the isotropic consolidation condition and the stress paths in the undrained triaxial compression tests.

关 键 词：overconsolidated clays current YIELD SURFACE REFERENCE YIELD SURFACE UNIFIED HARDENING parameter Hvorslev envelope. 

分 类 号：TB302[一般工业技术—材料科学与工程]