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Volume 35 Issue 6
Nov 2021
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Chinese Journal of High Pressure Physics  > 2021  >  35(6): 064202.
WANG Zhengtang, ZHANG Qi, WANG Chenlong, ZHAO Tingting, WANG Zhiyong. Influence of Joint Geometrical Parameters on Mechanical Properties of Rock Mass[J]. Chinese Journal of High Pressure Physics, 2021, 35(6): 064202. doi: 10.11858/gywlxb.20210753
Citation: WANG Zhengtang, ZHANG Qi, WANG Chenlong, ZHAO Tingting, WANG Zhiyong. Influence of Joint Geometrical Parameters on Mechanical Properties of Rock Mass[J]. Chinese Journal of High Pressure Physics, 2021, 35(6): 064202. doi: 10.11858/gywlxb.20210753
shu

Influence of Joint Geometrical Parameters on Mechanical Properties of Rock Mass

doi: 10.11858/gywlxb.20210753

  • Shanxi Key Laboratory of Material Strength & Structural Impact, School of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China

  • Received Date: 26 Mar 2021
  • Rev Recd Date: 20 Apr 2021
    Abstract
  • Rock mass is a discontinuous medium composed of intact rock and joints, whose mechanical properties are mainly determined by the geometrical and mechanical characteristics of joint. It is significantly valuable to explore the influence of joint on the mechanical behaviors of rock mass. In this paper, a synthetic rock mass model (SRM) is established by PFC2D software at first. Then the influence of joint geometrical parameters on rock mass mechanical properties, such as the strength indices and failure modes under uniaxial compression are studied. Through the orthogonal experimental analysis, the influence of the joint geometrical parameter on the strength index of rock mass is discussed. The analysis results show that when the joint dip angle is between 10° and 50°, the joint length, dip angle, spacing and rock bridge length have significant effect on the uniaxial compressive strength and elastic modulus of rock mass. When the joint dip angle is between 50° and 90°, the influence of the rock bridge length on the uniaxial compressive strength and elastic modulus of rock mass is not significant. The joint step angle has no significant influence on the uniaxial compressive strength and elastic modulus of rock mass no matter how much the joint dip angle is. The failure mode of rock mass is mainly affected by the joint dip angle and step angle. The research results provide valuable reference for the stability analysis of rock mass and the support design.

     

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