An experimental study of failure and softening in sand under three-dimensional stress condition

Granular Matter - Tập 10 - Trang 187-195 - 2008
De’an Sun1, Wenxiong Huang2, Yangping Yao3
1Department of Civil Engineering, Shanghai University, Shanghai, China
2Centre for Geotechnical and Materials Modelling, The University of Newcastle, Callaghan, Australia
3Department of Civil Engineering, Beijing University of Aeronautics and Astronautics, Beijing, China

Tóm tắt

This paper describes an experimental study of failure and softening behaviour in dense Toyoura sand. A true triaxial apparatus equipped with three pairs of rigid loading platens is used to test sand sample under three-dimensional stress condition. The testing results demonstrate that the rigid boundary around the sand samples cannot prevent formation of shear localization. Shear localization are observed to emerge in the hardening or the softening regime in the loading depending on the magnitude of intermediate principal stress. Uniform deformation for the whole strain range is obtained only in triaxial compression tests. The peak stress state obtained from tests of sand samples of the same initial density can be described with good approximation by the Matsuoka–Nakai criterion.

Tài liệu tham khảo

Matsuoka, H., Nakai, T.: Stress-deformation and strength characteristics of soil under three difference principal stresses. Proc. JSCE 232, 59–70 (1974)

Roscoe, K.H., Schofield, A.N., Wroth, C.P.: On yielding of soils. Géotechnique 8(1), 22–53 (1958)