Effect of contact state on the shear behavior of artificial rock joint

被引:1
作者
Zhi Cheng Tang
Run Qiu Huang
Quan Sheng Liu
Louis Ngai Yuen Wong
机构
[1] Wuhan University,School of Civil and Architectural Engineering
[2] Chengdu University of Technology,State Key Laboratory of Geohazard Prevention and Geoenvironmental Protection
[3] Nanyang Technological University,School of Civil and Environmental Engineering
[4] The University of Hong Kong,Department of Earth Sciences
来源
Bulletin of Engineering Geology and the Environment | 2016年 / 75卷
关键词
Artificial rock joint; Roughness; Contact state; Dislocation; Peak shear strength; Peak shear displacement; Shear stiffness; Shear velocity;
D O I
暂无
中图分类号
学科分类号
摘要
Rock joint surface roughness, which influences the shear resistance of joints, dictates the stability of rock blocks. However, there is a weakening effect on the shear behavior of a rock joint as it becomes “un-matching” caused by external factors, such as vibration due to nearby blasting, excavation or earthquake. This paper presents an experimental investigation of the shear behavior of artificial rock joints under different matching conditions by direct shear test, modeled by imposing varying magnitude of horizontal dislocation along the shear direction between the upper and lower rock blocks. The peak shear strength decreases with increasing dislocation. However, the effect of dislocation on peak shear strength becomes less pronounced as the normal stress increases. With increasing dislocation, the peak shear displacement increases; the shear stiffness decreases and gradually approaches a constant. The influence of dislocation on shear stiffness is more prominent under a higher applied normal stress. The results also show that the peak shear strength of matching joints is influenced mostly by shear velocity.
引用
收藏
页码:761 / 769
页数:8
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