Optimization and Practice on Method of Roof Control in Single-Support Coalface for Ascending Mining

Abstract:

Based on the geology and mining technology conditions of III2 coal seam in Xinzhuang Mine, the method of similar material simulation test was adopted to analyze the characteristics of overburden caving and weighting in coalface under ascending mining, and the software of Rock Failure Process Analysis System(RFPA2D) was applied to simulate and analyze the roof control effect under different mining sequence and supporting method, then engineering practice was made in III2-12111 coalface. The results showed: mining the III2 coal seam under ascending mining, the periodical weighting was 6.7 m; compared with the method of four rows single-support in maximum roof control span and three rows single-support in minimum roof control span (shorting for three-four rows roof control method) in coalface, adopting the method of three rows single-support in maximum roof control span and two rows single-support in minimum roof control span (shorting for three-two rows roof control method), gob stowing was tighter, and hanging arch distance was reduced, and roof strata stress reduced by 10~15%; the observed result of mine pressure showed, adopting three-two rows roof control method (row space for 1.2 m, column space for 0.5 m) in coalface, compression of props and roof-to-floor convergence meet the requirements, it ensured the safely and efficiently mining in coalface, and obtained the largest monthly output of 30000 t, average monthly output of 26000 t.

• Periodical: Advanced Materials Research (Volume 629)
• Pages: 943-949
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.629.943
• Online since: December 2012
• Authors: Xu Feng Wang, Li Wei Tian, Jin Liang Wang
• Keywords: Ascending Mining, Method of Roof Control, Simulation, Single-Support Coalface

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