›› 2010, Vol. 31 ›› Issue (6): 1841-1846.

• Geotechnical Engineering • Previous Articles     Next Articles

Study of deformation and controlling characteristics of limestone roof with thick layer and brittle-ductile state in Jincheng mining area

HAN Li-jun，JIANG Bin-song，HAN Gui-lei，QU Tao   

  1. State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China
  • Received:2009-03-04 Online:2010-06-10 Published:2010-06-25

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Abstract:

The K2 Limestone Immediate Roof of 15# coal seam in Jincheng mining area is 8-10 m in thickness. Such roof structure, which is dense and hard, belongs to strong and difficult collapse roof. Aiming at the thick limestone roof being possible to face with the large area roof fracture and collapse accident, and based on some mechanical parameters obtained from the rock mechanical test, the deformation and collapse characteristics of brittle-ductile thick limestone roof were analyzed by using key strata theory and synthetically researched by numerical simulation and similar material simulation, obtaining the first weighting step distance, periodic weighting step distance, and the collapse rules of such roof. The researches had similar results that the first weighting step distance is 20-25m and the periodic weighting step distance is 10-15 m. The actual mining practice indicated that the theoretical results are in good agreement with that of experiment on collapse characteristics and weighting step distance of thick limestone roof. Therefore, the research result has provided effective way and method to the research and control of the deformation and collapse characteristics of brittle-ductile thick limestone roof in Jincheng mining area.

Key words: limestone roof, key strata theory, numerical simulation, model made by similar materials, caving interval

CLC Number: 

  • TD 821
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