Undrained anisotropy and cyclic resistance of saturated silt subjected to various patterns of principal stress rotation

Author:

Chen Guoxing12ORCID,Wu Qi12,Zhou Zhenglong12,Ma Weijia12,Chen Weiyun12,Khoshnevisan Sara3,Yang Jun4ORCID

Affiliation:

1. Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing, P. R. China.

2. Civil Engineering and Earthquake Disaster Prevention Center of Jiangsu Province, Nanjing, P. R. China.

3. Civil and Environmental Engineering Department, Clarkson University, Potsdam, NY, USA.

4. Department of Civil Engineering, The University of Hong Kong, Hong Kong, P. R. China.

Abstract

Although the undrained anisotropic behaviour of sand has been extensively studied, little is known about undrained anisotropy and liquefaction susceptibility of silt soil. This paper presents a systematic experimental study on the undrained response of a silt soil under different patterns of principal stress rotation, including the 90° jump of principal stress and the continuous rotation of principal stress. Particular attention has been focused on the influence of the cyclic stress path and the influence of cyclic stress ratio (CSR) on the pore pressure ratio ru and the deviatoric strain amplitude γqa. A remarkable finding of this study is that, for all loading patterns investigated, the pore pressure ratio ru is uniquely related to the deviatoric strain amplitude γqa, rather than to the CSR. Based on the experimental data, an explicit expression is proposed to relate γqa and ru, which can be used to predict the onset of failure as well as the build-up of pore water pressure at a specific strain level. The study also found that the relationship between the CSR and the number of cycles required to failure (Nf) is dependent on cyclic loading patterns and stress paths. However, by defining a unit cyclic stress ratio (USR) as a new index for cyclic resistance, a virtually unique relationship between USR and Nf can be established for all cyclic loading patterns and stress paths considered.

Publisher

Thomas Telford Ltd.

Subject

Earth and Planetary Sciences (miscellaneous),Geotechnical Engineering and Engineering Geology

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