Uniqueness of rate-dependency, creep and stress relaxation behaviors for soft clays  

作　　者：朱启银 尹振宇 徐长节 殷建华 夏小和 

机构地区：[1]Department of Civil Engineering, Shanghai Jiao Tong University [2]State Key Laboratory for Geomechanics and Deep Underground Engineering(China University of Mining and Technology) [3]Lunan University, Ecole Centrale de Nantes,UMR CNRS Ge M, Nantes, France [4]School of Civil Engineering and Architecture Departments,East China Jiaotong University [5]Department of Civil and Environmental Engineering, Hong Kong Polytechnic University

出　　处：《Journal of Central South University》2015年第1期296-302,共7页中南大学学报（英文版）

基　　金：Projects(41372285,41272317,51278449,51238009)supported by the National Natural Science Foundation of China;Project(20110073120012)supported by Research Fund for the Doctoral Program of Higher Education of China;Project(PIAPP-GA2011-286397)supported by the European Program CREEP

摘　　要：This work focuses on the uniqueness of rate-dependency, creep and stress relaxation behaviors for soft clays under one-dimensional condition. An elasto-viscoplastic model is briefly introduced based on the rate-dependency of preconsolidation pressure. By comparing the rate-dependency formulation with the creep based formulation, the relationship between rate-dependency and creep behaviors is firstly described. The rate-dependency based formulation is then extended to derive an analytical solution for the stress relaxation behavior with defining a stress relaxation coefficient. Based on this, the relationship between the rate-dependency coefficient and the stress relaxation coefficient is derived. Therefore, the uniqueness between behaviors of rate-dependency, creep and stress relaxation with their key parameters is obtained. The uniqueness is finally validated by comparing the simulated rate-dependency of preconsolidation pressure, the estimated values of secondary compression coefficient and simulations of stress relaxation tests with test results on both reconstituted Illite and Berthierville clay.This work focuses on the uniqueness of rate-dependency, creep and stress relaxation behaviors for soft clays under one-dimensional condition. An elasto-viscoplastic model is briefly introduced based on the rate-dependency of preconsolidation pressure. By comparing the rate-dependency formulation with the creep based formulation, the relationship between rate-dependency and creep behaviors is firstly described. The rate-dependency based formulation is then extended to derive an analytical solution for the stress relaxation behavior with defining a stress relaxation coefficient. Based on this, the relationship between the rate-dependency coefficient and the stress relaxation coefficient is derived. Therefore, the uniqueness between behaviors of rate-dependency, creep and stress relaxation with their key parameters is obtained. The uniqueness is finally validated by comparing the simulated rate-dependency of preconsolidation pressure, the estimated values of secondary compression coefficient and simulations of stress relaxation tests with test results on both reconstituted Illite and Berthierville clay.

关 键 词：soft clays creep rate-dependency stress relaxation oedometer test 

分 类 号：O344.6[理学—固体力学]