Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (S1): 63-73.doi: 10.16285/j.rsm.2019.1234

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Mohr’s circle analysis and numerical simulation of stress state of pillar under combined compression-shear loading

LUO Bin-yu1, 2, YE Yi-cheng1, 2, 3, HU Nan-yan1, 2, 3, LI Peng-cheng1, 3, CHEN Chang-zhao1, 3   

  1. 1. College of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China; 2. Industrial Safety Engineering Technology Research Center of Hubei Province, Wuhan, Hubei 430081, China; 3. Hubei Key Laboratory for Efficient Utilization and Agglomeration of Met Allergic Mineral Resource, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China
  • Received:2019-07-14 Revised:2019-10-09 Online:2020-06-19 Published:2020-06-04
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51574183).

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Abstract: The stress state analysis of the pillar in inclined bedded ore-body mining is a key issue to ensure the safe mining. Based on the theory of rock mechanics, a mechanical model of inclined pillars under compression and shear loads is established, and the generalized Mohr circle equations describing the stress state of the pillars under compression-shear loading is derived. The position and radius of the generalized Mohr’s circle center are affected by the dip of the ore body and the loading on pillar, which reveal three types of stress evolution paths of the inclined pillar. These three stress paths are found to satisfy the line, circle and plane equation, respectively. Moreover, three types of control modes on the stress path evolution are presented. Based on the Mohr strength theory, the influences of stress path on pillar stability under three main control modes are analyzed. The inclined pillar is more easily unstable than vertical pillar and details are explained in this paper. Finally, the stress state of pillar obtained by numerical simulation is consistent with that of the general Mohr’s method, demonstrating that the failure mode of pillar is asymmetric hourglass shape. The results provide a new idea for the stability analysis of inclined pillars.

Key words: combined compression-shear loading, inclined pillar, stress state, general Mohr’s circle

CLC Number: 

  • TD31
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