Effect of variable confining pressure on cyclic behaviour of granular soil under triaxial tests

Canadian Geotechnical Journal - Tập 54 Số 6 - Trang 768-777 - 2017
Qi Sun1, Yuanqiang Cai2,3, Jian Chu4,5, Quanyang Dong1, Jun Wang1
1College of Civil Engineering and Architecture, The Key Laboratory of Engineering and Technology for Soft Soil Foundation and Tideland Reclamation of Zhejiang Province, Wenzhou University, Wenzhou 325035, P.R. China.
2College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, P.R. China
3College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, P.R. China; Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, P.R. China.
4Iowa State University, Civil, Construction and Environmental Engineering, Ames, IA 50011-2140, USA.
5School of Civil and Environmental Engineering, Nanyang Technological University, Blk N1, 50 Nanyang Ave., Singapore 639798; Iowa State University, Civil, Construction and Environmental Engineering, Ames, IA 50011-2140, USA.

Tóm tắt

Previous studies were performed to use combined cyclic deviatoric stress and confining pressure to simulate cyclic vertical and horizontal normal stresses under traffic loading. The effect of variable confining pressure (VCP) on the permanent deformation of soils was investigated. However, some studies concluded VCP could promote the development of permanent deformation compared to the tests with constant confining pressure (CCP), while others drew the opposite conclusions. In this study, three types of CCP and VCP tests with identical maximum stress, identical average stress, and identical initial stress were conducted. Test results showed VCP tests accumulated more permanent strains when CCP and VCP tests had identical maximum or average stress, and the permanent strains increased with the decrease in the inclinations of stress paths, while similar permanent strains were generated when CCP and VCP tests had identical initial stress. In addition, larger permanent strains were generated with the increase in stress ratio or length of stress path in both CCP and VCP tests. Considering that different strains were cumulated in CCP and VCP tests with the same stress ratio, it is recommended that both stress ratio and length of stress path be considered to assess the permanent deformation.

Từ khóa


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Thông tin xuất bản

Canadian Geotechnical Journal

Tập 54 Số 6

768-777

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