Numerical Analysis of the Influence of Bolt Set on the Shear Resistance of Jointed Rock Masses
Abstract
Bolt reinforcement is a standard reinforcement method for jointed rock masses. However, regarding rock anchoring, the mechanical characteristics of the joint surface, as well as the angle between the bolt and the joint sliding surface, are important factors that affect rock support. Therefore, to understand the influence of a set angle, length, normal load, and other conditions that affect the shear strength of bolt joints, this study uses numerical software to establish the shear sliding model of bolt rock masses and analyzes the influence of the setting conditions of the bolt on the shear strength of a bolt rock mass, which can be done by changing the setting method of the bolt and normal mechanical conditions of the sliding surface. The results show that the shear strength of the anchor joint is not affected after the anchor reaches a certain length. The angle of the anchor strongly influences the shear strength of the anchor joint, and the shear strength curve is V-shaped, where the anchor angle is less than 90°. Moreover, the shear strength curve indicates a downward trend when the anchor angle is greater than 90°, and the shear strength of the anchorage joint increases with the increase of the normal load. Under the same anchor length (4 cm) in the anchor angle and shear strength coordinate system, the shear strength curve of the single anchor is above the shear strength curve of the double anchor, which is exclusively in the local anchor angle section under the condition of a large normal load and a large anchor angle. The shear strength curve of the double anchor is above the shear strength curve of the single anchor.
Keywords
References
Runqiu, Huang. “Some Catastrophic Landslides Since the Twentieth Century in the Southwest of China.” Landslides 6, no. 1 (February 24, 2009): 69–81. doi:10.1007/s10346-009-0142-y.
Wu, Xuezhen, Yujing Jiang, and Bo Li. “Influence of Joint Roughness on the Shear Behaviour of Fully Encapsulated Rock Bolt.” Rock Mechanics and Rock Engineering 51, no. 3 (December 5, 2017): 953–959. doi:10.1007/s00603-017-1365-1.
Liu, Caihua, and Yuzong Li. “Predicting the Shear Resistance Contribution of Passive Fully Grouted Bolts to Jointed Rock.” International Journal of Geomechanics 20, no. 2 (February 2020): 04019174. doi:10.1061/(asce)gm.1943-5622.0001581.
Wu, Xuezhen, Yujing Jiang, Bin Gong, Zhenchang Guan, and Tao Deng. “Shear Performance of Rock Joint Reinforced by Fully Encapsulated Rock Bolt Under Cyclic Loading Condition.” Rock Mechanics and Rock Engineering 52, no. 8 (January 2, 2019): 2681–2690. doi:10.1007/s00603-018-1698-4.
Li, Xuwei, Guanyu Yang, Jan Nemcik, Ali Mirzaghorbanali, and Naj Aziz. “Numerical Investigation of the Shear Behaviour of a Cable Bolt in Single Shear Test.” Tunnelling and Underground Space Technology 84 (February 2019): 227–236. doi:10.1016/j.tust.2018.11.016.
Chen, Na, Xiaobo Zhang, Qinghui Jiang, Xixia Feng, Wei Wei, and Bing Yi. “Shear Behavior of Rough Rock Joints Reinforced by Bolts.” International Journal of Geomechanics 18, no. 1 (January 2018): 04017130. doi:10.1061/(asce)gm.1943-5622.0001048.
Liu Quansheng, Lei Guangfeng, Peng Xingxin, Wei Lai, and Luo Ciyou. “Study on Mechanical Shear Properties of Sandstone, Marble, and Granite after Anchoring.” Chinese Journal of Rock Mechanics and Engineering 37, no. 2 (2018): 4007-4015. doi:10.13722/j.cnki.jrme.2017.0646.
Chen, Yulong, Junyang Teng, Rana Ammad Bin Sadiq, and Ke Zhang. “Experimental Study of Bolt-Anchoring Mechanism for Bedded Rock Mass.” International Journal of Geomechanics 20, no. 4 (April 2020): 04020019. doi:10.1061/(asce)gm.1943-5622.0001561.
Li, Yuzong, and Caihua Liu. “Experimental Study on the Shear Behavior of Fully Grouted Bolts.” Construction and Building Materials 223 (October 2019): 1123–1134. doi:10.1016/j.conbuildmat.2019.06.207.
Yao, Qiangling, Chuanjin Tang, Liu Zhu, Zhenyu Li, Zhijun Niu, and Xuehua Li. “Study on the Weakening Mechanism of Anchorage Interface Under the Action of Water.” Engineering Failure Analysis 104 (October 2019): 727–739. doi:10.1016/j.engfailanal.2019.06.066.
Ma, Shuqi, Zhiye Zhao, and Junlong Shang. “An Analytical Model for Shear Behaviour of Bolted Rock Joints.” International Journal of Rock Mechanics and Mining Sciences 121 (September 2019): 104019. doi:10.1016/j.ijrmms.2019.04.005.
Wang Bin, Ning Yong, Feng Tao, and Guo Zeyang. “Experimental study on anchoring effect of brittle rock mass influenced by loading rates at low strain rate.” Meitan Xuebao/Journal of the China Coal Society 44, no. 9 (September 2019): 2691-2699. doi:10.13225/j.cnki.jccs.2018.1249.
Wu, Xuezhen, Yujing Jiang, Bin Gong, Zhenchang Guan, and Tao Deng. “Shear Performance of Rock Joint Reinforced by Fully Encapsulated Rock Bolt Under Cyclic Loading Condition.” Rock Mechanics and Rock Engineering 52, no. 8 (January 2, 2019): 2681–2690. doi:10.1007/s00603-018-1698-4..
Li, Xuwei, Guanyu Yang, Jan Nemcik, Ali Mirzaghorbanali, and Naj Aziz. “Numerical Investigation of the Shear Behaviour of a Cable Bolt in Single Shear Test.” Tunnelling and Underground Space Technology 84 (February 2019): 227–236. doi:10.1016/j.tust.2018.11.016.
Lin, Hang, Zheyi Xiong, Taoying Liu, Rihong Cao, and Ping Cao. “Numerical Simulations of the Effect of Bolt Inclination on the Shear Strength of Rock Joints.” International Journal of Rock Mechanics and Mining Sciences 66 (February 2014): 49–56. doi:10.1016/j.ijrmms.2013.12.010.
Chen, Yu, and Charlie Chunlin Li. “Performance of Fully Encapsulated Rebar Bolts and D-Bolts Under Combined Pull-and-Shear Loading.” Tunnelling and Underground Space Technology 45 (January 2015): 99–106. doi:10.1016/j.tust.2014.09.008.
Li, Yuzong, and Caihua Liu. “Experimental Study on the Shear Behavior of Fully Grouted Bolts.” Construction and Building Materials 223 (October 2019): 1123–1134. doi:10.1016/j.conbuildmat.2019.06.207.
Riyad, A.S.M., Md. Rokonuzzaman, and Toshinori Sakai. “Progressive Failure and Scale Effect of Anchor Foundations in Sand.” Ocean Engineering 195 (January 2020): 106496. doi:10.1016/j.oceaneng.2019.106496.
Ceroni, Francesca, Hossein Darban, and Raimondo Luciano. “Analysis of Bond Behavior of Injected Anchors in Masonry Elements by Means of Finite Element Modeling.” Composite Structures 241 (June 2020): 112099. doi:10.1016/j.compstruct.2020.112099.
Sheng-fang Luo. “Study on Numerical Simulation of Direct Shear Test of Bolted Joints.” Master's Thesis, National Taiwan University of Science and Technology (1991).
DOI: 10.28991/cej-2020-03091527
Refbacks
Copyright (c) 2020 Yanping Wang, LiangXiao Xiong
This work is licensed under a Creative Commons Attribution 4.0 International License.
