Strength criterion for cross-anisotropic sand under general stress conditions
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- 作者：Xilin Lü ; Maosong Huang ; José E. Andrade
- 关键词：Cross ; anisotropy ; Friction angle ; Hollow cylinder torsional shear test ; Intermediate principal stress ratio ; Sand ; True triaxial test
- 刊名：Acta Geotechnica
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：11
- 期：6
- 页码：1339-1350
- 全文大小：2,019 KB
- 刊物类别：Engineering
- 刊物主题：Continuum Mechanics and Mechanics of Materials
Geotechnical Engineering
Soil Science and Conservation
Granular Media
Structural Mechanics - 出版者：Springer Berlin / Heidelberg
- ISSN：1861-1133
- 卷排序：11
文摘
By incorporating the fabric effect and Lode’s angle dependence into the Mohr–Coulomb failure criterion, a strength criterion for cross-anisotropic sand under general stress conditions was proposed. The obtained criterion has only three material parameters which can be specified by conventional triaxial tests. The formula to calculate the friction angle under any loading direction and intermediate principal stress ratio condition was deduced, and the influence of the degree of the cross-anisotropy was quantified. The friction angles of sand in triaxial, true triaxial, and hollow cylinder torsional shear tests were obtained, and a parametric analysis was used to detect the varying characteristics. The friction angle becomes smaller when the major principal stress changes from perpendicular to parallel to the bedding plane. The loading direction and intermediate principal stress ratio are unrelated in true triaxial tests, and their influences on the friction angle can be well captured by the proposed criterion. In hollow cylinder torsional shear tests with the same internal and external pressures, the loading direction and intermediate principal stress ratio are related. This property results in a lower friction angle in the hollow cylinder torsional shear test than that in the true triaxial test under the same intermediate principal stress ratio condition. By comparing the calculated friction angle with the experimental results under various loading conditions (e.g., triaxial, true triaxial, and hollow cylinder torsional shear test), the proposed criterion was verified to be able to characterize the shear strength of cross-anisotropic sand under general stress conditions.