Journal of Zhejiang University

Journal of Zhejiang University SCIENCE A 2014 Vol.15 No.4 P.241-254

Undrained anisotropy and non-coaxial behavior of clayey soil under principal stress rotation*

Author(s): Jian Zhou,Jia-jia Yan,Zheng-yi Liu,Xiao-nan Gong
Affiliation(s): 1. . Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
Corresponding email(s): zjelim@zju.edu.cn
Key Words: Non-coaxiality, Clay, Principal stress rotation, Anisotropy

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Jian Zhou, Jia-jia Yan, Zheng-yi Liu, Xiao-nan Gong. Undrained anisotropy and non-coaxial behavior of clayey soil under principal stress rotation[J]. Journal of Zhejiang University Science A, 2014, 15(4): 241-254.

@article{title="Undrained anisotropy and non-coaxial behavior of clayey soil under principal stress rotation",
author="Jian Zhou, Jia-jia Yan, Zheng-yi Liu, Xiao-nan Gong",
journal="Journal of Zhejiang University Science A",
volume="15",
number="4",
pages="241-254",
year="2014",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1300277"
}

%0 Journal Article
%T Undrained anisotropy and non-coaxial behavior of clayey soil under principal stress rotation
%A Jian Zhou
%A Jia-jia Yan
%A Zheng-yi Liu
%A Xiao-nan Gong
%J Journal of Zhejiang University SCIENCE A
%V 15
%N 4
%P 241-254
%@ 1673-565X
%D 2014
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1300277

TY - JOUR
T1 - Undrained anisotropy and non-coaxial behavior of clayey soil under principal stress rotation
A1 - Jian Zhou
A1 - Jia-jia Yan
A1 - Zheng-yi Liu
A1 - Xiao-nan Gong
J0 - Journal of Zhejiang University Science A
VL - 15
IS - 4
SP - 241
EP - 254
%@ 1673-565X
Y1 - 2014
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1300277

Abstract
Chinese Summary
Academic Network
Reviewer Comment

Abstract: In this study, a series of undrained tests were conducted on both intact and reconstituted clay using an automatic hollow cylinder apparatus. Monotonic shearing tests with fixed principal stress directions were carried out, pure and cyclic principal stress rotation tests were also performed. The non-coaxiality, defined as the non-coincidence of the principal plastic strain increment direction and the corresponding principal stress direction, of clayey soil was studied experimentally. The effects of the intermediate principal stress, shear stress level, and inherent anisotropy were highlighted. Clear non-coaxiality was observed during pure principal stress rotation, in both intact and reconstituted clay. The influence of the intermediate principal stress parameter, shear stress level, and inherent anisotropy on the non-coaxial behavior of the clayey soil was found to be insignificant when compared with the sand. The non-coaxial behavior of the clayey soil depended more on the stress paths. Under undrained conditions, the contribution of elastic strain to the direction of the total principal strain increment cannot be ignored.

主应力轴旋转条件下粘土的各向异性和非共轴特性

研究目的：研究主应力轴旋转条件下粘土的非共轴塑性流动规律和内在机理，并分析土体初始各向异性、中主应力系数、剪应力水平等对非共轴塑性流动特性的影响。
创新要点：对主应力轴旋转条件下粘土塑性应变增量方向的规律和内在机理及影响因素进行分析，为考虑主应力轴旋转影响的粘土本构模型的建立提供了试验依据。
研究方法：通过对比试验，研究原状粘土和重塑粘土的非共轴塑性流动特性，对非共轴塑性流动的规律和内在机理及影响因素进行分析。
重要结论：主应力旋转剪切条件下，粘土的塑性主应变增量方向与主应力方向存在显著差异。非共轴特性不完全取决于土体的各向异性特性，受应力路径的影响也较大。

关键词：主应力旋转；粘土；非共轴；各向异性