Behavior of anisotropic mica sand under fixed principal stress axes drained shear test

YU Yi-lin; ZHANG Jian-min; TONG Zhao-xia; ZHANG Ga

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Behavior of anisotropic mica sand under fixed principal stress axes drained shear test

更新时间：2026-06-25

- Behavior of anisotropic mica sand under fixed principal stress axes drained shear test
- Vol. 32, Issue 6, (2011)
- 作者机构：
  
  1. 清华大学水沙科学与水利水电工程国家重点实验室,北京,100084
  2. 北京航空航天大学交通科学与工程学院,北京,100191
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU443
- Online First：21 June 2011，
  
  Published：2011
- 稿件说明：
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YU Yi-lin, ZHANG Jian-min, TONG Zhao-xia, et al. Behavior of anisotropic mica sand under fixed principal stress axes drained shear test[J]. 2011, 32(6).
DOI：

YU Yi-lin, ZHANG Jian-min, TONG Zhao-xia, et al. Behavior of anisotropic mica sand under fixed principal stress axes drained shear test[J]. 2011, 32(6). DOI：

摘要

南京云母砂主要由片状颗粒组成，具有较为明显的各向异性特性。采用香港科技大学的自动控制空心圆柱扭剪仪进行了应力主轴方向角分别为10°、30°、60°、80°的密实云母砂定轴剪切试验，研究云母砂的初始各向异性规律。为研究中主应力的影响，又对同一密度的试样在中主应力系数b＝0.1、0.5、1.0三种不同情况下进行定轴剪切试验。试验结果表明，在大主应力方向角从0°～90°的变化过程中，强度先减小后增大，且随着b值的增加强度增大；变形表现出明显的各向异性，随着b值的增加体变增大

Abstract

Nanjing mica sand is anisotropic because of its contents of flake grains. A series of drained tests for principal stress axes was fixed at 10°

30°

60°

80° were conducted with an automated hollow cylinder apparatus in Hong Kong University of Science and Technology

in order to study the inherent anisotropic characters of mica sand. During the tests

the coefficient of intermediate principal stress was fixed at 0.1

0.5 and 1.0

and the beginning density of sand was same. When the orientation angle of major principal stress changes from 0° to 90°

the shear strength of mica sands at first tends to reduce

reaches its minimum value at the orientation angle of 60°

and then increases gradually. The coefficient of intermediate principal stress has a great impact on the shear strength and deformation of anisotropic sands

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