›› 2010, Vol. 31 ›› Issue (9): 2987-2990.

• Numerical Analysis • Previous Articles     Next Articles

Application of SMP failure criterion to computing limit strength of coal pillars

ZHU Jian-ming 1, 2，PENG Xin-po2，YAO Yang-ping2，XU Jin-hai3   

  1. 1. College of Architecture, North China University of Technology, Beijing 100041, China; 2. School of Traffic Science and Technology, Beihang University, Beijing 100191, China; 3. School of Mining Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China
  • Received:2010-02-03 Online:2010-09-10 Published:2010-09-16

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Abstract:

Based on the spatially mobilized plane (SMP) failure criterion of the coherent material, the stress problem for the coal pillar under the three-dimensional stress states was analyzed; and the formula of limit strength of the coal pillar was derived. Through changing the internal friction ? and the cohesion c of the coal, compared with the limit strength of the coal pillar using the Mohr-Coulomb failure criterion and the simplified A. H. Wilson formula, it is shown that because of neglecting the influence of the intermediate principal stress in the Mohr-Coulomb failure criterion and A.H.Wilson formula of the limit strength of coal pillar underestimate the actual limit strength; and it also is shown that limit strength computing of the coal pillar based on the SMP failure criterion of the coherent material has certain practical significance.

Key words: spatially mobilized plane (SMP) failure criterion, three-dimensional stress, limit strength, coal pillar

CLC Number: 

  • TD 322.4
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