Shear Behavior of Bolt-Reinforced Joint Rock Under Varying Stress Environment
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ORIGINAL PAPER
Shear Behavior of Bolt-Reinforced Joint Rock Under Varying Stress Environment Hang Lin . Penghui Sun . Yifan Chen . Yixian Wang
. Yanlin Zhao
Received: 30 March 2020 / Accepted: 25 May 2020 Ó Springer Nature Switzerland AG 2020
Abstract Bolt empowers significant efficacy in reinforcing jointed rock mass, which is mainly embodied in the enhancement of shear performance and the restraint to the dislocation between rock blocks. However, the prevailing assumption that the influencing area of bolt covers the whole joint surface contradicts to the experimental evidence of direct shear tests. In this case, by adopting saw-tooth filling joint samples made of rock-like materials, the direct shear tests were conducted under different normal stresses, and the influencing mechanism of bolt on the shear performance was investigated. Then, the similarities and differences in shear strength, deformation,
and failure patterns of unbolted and bolted joints with different filling ratios were analyzed. Besides, based on the assumption of elliptical influencing area of bolt, a new shear strength calculation model of bolted joints was established, and theoretical calculation results show an excellent agreement with test results, verifying the rationality and validity of the proposed model. Keywords Saw-tooth joint Bolt Shear strength Indoor tests Elliptical influencing area
1 Introduction H. Lin P. Sun Y. Chen (&) School of Resource and Safety Engineering, Central South University, Changsha 410083, Hunan, China e-mail: [email protected] H. Lin e-mail: [email protected] P. Sun e-mail: [email protected] Y. Wang (&) School of Civil Engineering, Hefei University of Technology, Hefei 230009, China e-mail: [email protected] Y. Zhao School of Energy and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China e-mail: [email protected]
Natural rock mass is composed of rock blocks and joints, and the latter has immense impact on the mechanical properties of rock mass (Wang et al. 2019; Wen et al. 2019, 2020; Zhang et al. 2020a, b; Zhang et al. 2020a, b). And typically, the majority of instability of natural or engineering rock mass can be attributed to joint failure (Grasselli 2006; Kwon et al. 2010; Park and Song 2009). Therefore, numerous studies on shear mechanics behavior has constantly been conducted and various anchorage techniques are proposed (Grasselli and Egger 2003). Wherein, as a powerful tool, rock bolt empowers significant efficacy in reinforcing rock mass and develop rapidly, despite the bolting mechanism is an extremely complex
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Geotech Geol Eng
mechanical transfer process, particularly for joint rock mass (Chen 2014; Ma et al. 2019). The reinforcement effect of bolt on joint rock mass is mainly embodied in the enhancement of shear performance and restraint to the dislocation between rock blocks, and there exist a number of influencing factors, such as diameter, inclination, pre-stress, and rock
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