Geomechanics and Engineering

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Study on bearing characteristic of rock mass with different structures: Physical modeling

  • Zhao, Zhenlong (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology) ;
  • Jing, Hongwen (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology) ;
  • Shi, Xinshuai (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology) ;
  • Yang, Lijun (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology) ;
  • Yin, Qian (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology) ;
  • Gao, Yuan (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology)
  • Received : 2021.01.15
  • Accepted : 2021.04.08
  • Published : 2021.05.10
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Abstract

In this paper, to study the stability of surrounding rock during roadway excavation in different rock mass structures, the physical model test for roadway excavation process in three types of intact rock mass, layered rock mass and massive rock mass were carried out by using the self-developed two-dimensional simulation testing system of complex underground engineering. Firstly, based on the engineering background of a deep mine in eastern China, the similar materials of the most appropriate ratio in line with the similarity theory were tested, compared and determined. Then, the physical models of four different schemes with 1000 mm (height) × 1000 mm (length) × 250 mm (width) were constructed. Finally, the roadway excavation was carried out after applying boundary conditions to the physical model by the simulation testing system. The results indicate that the supporting effect of rockbolts has a great influence on the shallow surrounding rock, and the rock mass structure can affect the overall stability of the surrounding rock. Furthermore, the failure mechanism and bearing capacity of surrounding rock were further discussed from the comparison of stress evolution characteristics, distribution of stress arch, and failure modes in different schemes.

Keywords

Acknowledgement

This work was supported by National Natural Science Foundation of China (grant number 51734009, 52074259, 51904290). The authors gratefully appreciate these supports. It should be noted that in the process of collating data, the sources of some figures and ideas were not found. I hereby apologize and thank the authorship.

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