Geomechanics and Engineering

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Experimental investigation on bolted rock mass under static-dynamic coupled loading

  • Qiu, Pengqi (College of energy and mining engineering, Shandong University of Science and Technology) ;
  • Wang, Jun (College of energy and mining engineering, Shandong University of Science and Technology) ;
  • Ning, Jianguo (College of energy and mining engineering, Shandong University of Science and Technology) ;
  • Shi, Xinshuai (College of energy and mining engineering, Shandong University of Science and Technology) ;
  • Hu, Shanchao (College of energy and mining engineering, Shandong University of Science and Technology)
  • Received : 2021.04.26
  • Accepted : 2022.01.25
  • Published : 2022.04.25
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Abstract

Instability of bolted rock mass has been a major hazard in the underground coal mining industry for decades. Developing effective support guidelines requires understanding of complex bolted rock mass failure mechanisms. In this study, the dynamic failure behavior, mechanical behavior, and energy evolution of a laboratory-scale bolted specimens is studied by conducting laboratory static-dynamic coupled loading tests. The results showed that: (1) Under static-dynamic coupled loading, the stress-strain curve of the bolted rock mass has a significant impact velocity (strain rate) correlation, and the stress-strain curve shows rebound characteristics after the peak; (2) There is a critical strain rate in a rock mass under static-dynamic coupled loading, and it decreases exponentially with increasing pre-static load level. Bolting can significantly improve the critical strain rate of a rock mass; (3) Compared with a no-bolt rock mass, the dissipation energy ratio of the bolted rock mass decreases exponentially with increasing pre-static load level, the ultimate dynamic impact energy and dissipation energy of the bolted rock mass increase significantly, and the increasing index of the ratio of dissipation energy increases linearly with the pre-static load; (4) Based on laboratory testing and on-site microseismic and stress monitoring, a design method is proposed for a roadway bolt support against dynamic load disturbance, which provides guidance for the design of deep underground roadway anchorage supports. The research results provide new ideas for explaining the failure behavior of anchorage supports and adopting reasonable design and construction practices.

Keywords

Acknowledgement

The research described in this paper was financially supported by National Key R&D Program of China (no. 2018YFC0604703); National Natural Science Foundation of China (no. 52074170, 52074166, 51904163); Youth Foundation of Natural Science Foundation of Shandong Province (no. ZR2019QEE002, ZR2017BEE013). The authors express sincere thanks to the reviewers for their helpful comments and suggestions for improving this paper.

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