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Title: Several shear spatially mobilized planes and anisotropic strength criteria of soils
Authors: Shao, Sheng-Jun1, 2 ; Xu, Ping1, 2 ; Chen, Chang-Lu1, 3/邵生俊;徐萍;陈昌禄
Author affiliation: 1 Institute of Geotechnical Engineering, Xi'an University of Technology,
Xi'an 710048, China
2 Shaanxi Key Laboratory of Loess Mechanics and Engineering, Xi'an 710048, China
3 Bijie University, Bijie 551700, China
Corresponding author: Shao, S.-J. ([e-mail])
Source title: Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering
Abbreviated source title: Yantu Gongcheng Xuebao
Volume: 35
Issue: 3
Issue date: March 2013
Publication year: 2013
Pages: 422-435
Language: Chinese
ISSN: 10004548
CODEN: YGXUEB
Document type: Journal article (JA)
Publisher: Chinese Society of Civil Engineering, 34 Hujuguan, Nanjing, 210024, China
Abstract: The strength laws of natural soils are complex because of their anisotropic and
structural properties, and stress anisotropy and damage of structures under loading. By analyzing
the shear failure planes or spatially mobilized planes of the Mohr-Coulomb criterion,
Drucker-Prager criterion and Matsuoka-Nakai strength criterion, two kinds of spatially mobilized
planes, static spatially mobilized plane with unchanging normal direction and dynamic spatially
mobilized plane with changing normal direction, are proposed respectively by changing the
characteristics of normal direction on the spatially mobilized plane. According to the
Mohr-Coulomb failure plane and Matsuoka-Nakai's spatially mobilized plane, the static axial
symmetrical compression spatially mobilized plane and axial extension spatially mobilized plane
are obtained respectively under axial symmetrical compression and axial extension stress states.
Assuming the linear relation between shear stress and normal stress on the spatially mobilized
plane of soil element, the new isotropic and anisotropic strength criteria are established based
on the stress conditions of two kinds of static spatially mobilized planes, which are determined
respectively by the axial symmetrical compression and axial symmetrical extension stress states.
For the intact loess with micro-structural characteristics including vertical crack and transversely
isotropic body, the anisotropic strength is revealed by the true triaxial experiments on intact loess,
in which the maximum principal stress, intermediate principal stress or minor principal stress act
on the vertical direction of loess sample. Considering the relationship between the Cartesian
coordinates corresponding to vertical crack of loess and rotation of the maximum, intermediate
and minor principal stress axes, the spatial strength surface in the principal stress space being the
same as that in the Cartesian coordinates. At the same time, the rationality of the above strength
criteria is validated by the true axial test results of intact loess with vertical crack structure. The
new strength criteria are analyzed by the geometrical characteristics of strength surfaces in the
principal stress three-dimensional space.
Number of references: 7