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Shear Behavior of Bolt-Reinforced Joint Rock Under Varying Stress Environment

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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.

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Acknowledgements

This paper gets its funding from project (51774322) supported by National Natural Science Foundation of China; Project (2018JJ2500) supported by Hunan Provincial Natural Science Foundation of China. The authors wish to acknowledge these supports.

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Authors and Affiliations

  1. School of Resource and Safety Engineering, Central South University, Changsha, 410083, Hunan, China

    Hang Lin, Penghui Sun & Yifan Chen

  2. School of Civil Engineering, Hefei University of Technology, Hefei, 230009, China

    Yixian Wang

  3. School of Energy and Safety Engineering, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China

    Yanlin Zhao

Authors
  1. Hang Lin
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  2. Penghui Sun
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  3. Yifan Chen
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  4. Yixian Wang
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  5. Yanlin Zhao
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Correspondence to Yifan Chen or Yixian Wang.

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Lin, H., Sun, P., Chen, Y. et al. Shear Behavior of Bolt-Reinforced Joint Rock Under Varying Stress Environment. Geotech Geol Eng 38, 5755–5770 (2020). https://doi.org/10.1007/s10706-020-01391-6

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  • DOI: https://doi.org/10.1007/s10706-020-01391-6

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