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Advances in Materials Science and Engineering
Volume 2017, Article ID 1627103, 15 pages
https://doi.org/10.1155/2017/1627103
Research Article

Macro-Micro Failure Mechanisms and Damage Modeling of a Bolted Rock Joint

1Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, China
2State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
3Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, Shandong 250061, China
4College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266555, China

Correspondence should be addressed to Gang Wang; moc.liamg@0111gnaggnaw

Received 15 December 2016; Revised 3 June 2017; Accepted 28 June 2017; Published 31 August 2017

Academic Editor: Fernando Lusquiños

Copyright © 2017 Gang Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The anchoring mechanism of a bolted joint subjected to a shear load was investigated using a bilinear constitutive model via the inner-embedded FISH language of particle flow code based on the discrete element method. The influences of the anchoring system on the macro-/micromechanical response were studied by varying the inclination angle of the bolt. The results indicate a clear relationship between the mechanical response of a bolted rock joint and the mechanical properties of the anchoring angle. By optimizing the anchorage angle, the peak strength can be increased by nearly 50% relative to that at an anchorage angle of 90°. The optimal anchorage angle ranges from 45° to 75°. The damage mechanism at the optimal anchorage angle joint is revealed from a macroscopic mechanical perspective. The concentration of the contact force between disks will appear in the joint and around the bolt, resulting in crack initiation. These cracks are mainly tensile cracks, which are consistent with the formation mechanism for compression-induced tensile cracks. Therefore, the macroscopic peak shear stress in the joint and the microscopic damage to the anchoring system should be considered when determining the optimal anchoring angle to reinforce a jointed rock mass.