Stress relaxation coefficient and formulation for soft soils

被引:60
作者
Yin, Z. -Y. [1 ,2 ]
Zhu, Q. -Y. [1 ,2 ]
Yin, J. -H. [3 ]
Ni, Q. [4 ]
机构
[1] Lunan Univ, Ecole Cent Nantes, UMR CNRS GeM, Nantes, France
[2] Shanghai Jiao Tong Univ, Dept Civil Engn, Shanghai 200030, Peoples R China
[3] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Hong Kong, Peoples R China
[4] Univ Warwick, Dept Civil Engn, Coventry CV4 7AL, W Midlands, England
基金
高等学校博士学科点专项科研基金; 中国国家自然科学基金;
关键词
clays; laboratory tests; time dependence; TIME-DEPENDENT BEHAVIOR; VISCOPLASTIC BEHAVIOR; STRAIN BEHAVIOR; CLAYS;
D O I
10.1680/geolett.13.00070
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Current studies rarely investigate the stress relaxation behaviour of soft soils. This paper proposes a practically useful coefficient with a formulation based on the behaviour of stress relaxation under one-dimensional conditions. Firstly, the stress relaxation coefficient is proposed after summarising stress relaxation test results according to the linear relationship between the vertical stress and time in a double logarithmic plot. Secondly, from the newly developed rate-dependency based elasto-viscoplastic formulations, an analytical solution for stress relaxation is derived. A unique relationship connecting the stress relaxation coefficient, the secondary compression coefficient and the rate-dependency coefficient is then obtained. The applicability of the stress relaxation formulation with its key coefficient to determine time-dependent parameters is finally validated with published experimental results on reconstituted illite and Berthierville clay.
引用
收藏
页码:45 / 51
页数:7
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