Macro-micro study on failure mechanism of rock mass anchorage joints under different roughness

被引：3

作者：

Zhang, Yongzheng ^{[1
,2
]}

Wang, Gang ^{[1
,2
]}

Ma, Ming ^{[1
]}

Zhao, Zhipeng ^{[1
]}

Zhao, Yunpeng ^{[1
]}

Sun, Zhaohui ^{[1
]}

机构：

[1] Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao,266590, China

[2] State Key Laboratory of Mining Disaster Prevention and Control Cofounded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao,266590, China

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2017年 / 48卷 / 12期

基金：

中国国家自然科学基金;

关键词：

Failure (mechanical) - Shear stress - Rock mechanics - Rocks - Shear flow - Friction - Microcracks;

D O I：

10.11817/j.issn.1672-7207.2017.12.031

中图分类号：

学科分类号：

摘要：

In order to research the microscopic anchoring mechanism of different roughness in jointed rock mass, a model of anchoring joints with six different roughness was built by using the particle flow code in two-dimensions(PFC2D), and a series of numerical simulation direct shear tests under five different constant loads were carried out. And the influence of JRC value and particle friction coefficient of anchoring joint on the anchoring joint shear strength was analyzed. At the same time, the damage process of asperities on rough surface and the corresponding microscopic cracks development was also monitored in the numerical direct shear tests. The results show that the micro convex body is slightly damage in the joint shear test, the peak shear stress of anchoring joints increases with the increase of anchoring joint roughness and the particle frictional coefficient of the anchoring joints, but the peak shear stress has a little decay with the damage of the micro convex body. Microscopic cracks produce firstly in the convex joint surface, and with the shear displacement increasing, the number of microcracks increases rapidly around the bolt and the microcracks are not only on the surface of the anchoring joint plane, but also happen inside the model. The produced cracks are mainly tensile cracks. The number of the contact force and the distribution range of contact azimuth angle of the anchoring joint decrease with the shear displacement increasing, and the direction of the contact azimuth angle is gradually changed to the direction of shear load. © 2017, Central South University Press. All right reserved.

引用

页码：3373 / 3383