STUDY OF SUBLEVEL COALS DISPLACEMENT MECHANICS IN EXTREMELY THICK COAL SEAMS WITH BUMP TENDENCY
On the basis of bump characteristic analysis of a bump coal mine in the west of Henan Province in China, in-situ displacement experiments were conducted. The results indicate that sublevel coals displacement in extremely thick coal seam with bump tendency has obvious three-layer-phenomena (roof action layer, short beam structure layer and support action layer). In the view of the resultant force, the top coal above the support is considered as the roof action layer which can be totally destroyed by the head abutment pressure and tensile strength from roofs rotation. Short beam structure layer is affected a little by the abutment pressure and tensile strength from the roofs rotation and support. Also, the support action layer can be fully destroyed by the raising and lowering movement of the support and is with accordance with the lab simulation results.
HUA NAN YUN-FENG LIU
Department of Resources Science and Engineering, Henan Polytechnic University Jiaozuo 454000 ,P.R.Ch Chao-hua Coal Mine, Zheng-zhou Coal Group Xin mi, 452370, P.R.China
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
1283-1288
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）