›› 2013, Vol. 34 ›› Issue (12): 3505-3512.

• Geotechnical Engineering • Previous Articles     Next Articles

Study of critical thickness of roof of level pillar stoping under multifactor influence

WANG Xiao-jun1, 2, FENG Xiao3, ZHAO Kui3, SHAO Hai1, YE Zi-huan1   

  1. 1. School of Resources & Environment Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China; 2. Post-doctoral Scientific Research Workstation, Western Mining Co., Ltd., Central South University, Xining 810006, China 3. School of Engineering Research, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China
  • Received:2012-12-11 Online:2013-12-10 Published:2013-12-19

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Abstract: For level pillar stoping under loose medium, determining the critical thickness of roof is difficult. In order to solve the problem, using elastic beam theory, the level pillar is simplified as a mechanical model of a beam fixed at both ends under uniform load; and is considered to be the main failure stress according to the elastic stress solution of beam. Theoretical analysis shows: in level pillar stoping process, the main influence factors of critical thickness of roof is loose medium load, stoping span and tensile strength of rocks. Through using FLAC3D and combining with orthogonal experiment result of numerical simulation, the relationship between single influence factor and critical thickness of roof is revealed. Based on multiple nonlinear regression analysis method, the mathematical forecasting formula of critical thickness of roof under multifactor influence is established. Finally, The critical thickness of the roof is predicted accurately; and applicability of the mathematical forecasting formula is verified by the engineering practice of level pillar stoping in Fenghuangshan Mine.

Key words: loose medium, critical thickness, elastic beam, orthogonal experiment, multiple nonlinear regression

CLC Number: 

  • TU 42
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