Stress distribution rule of roadway affected by overhead mining in gently inclined coal seams group

KANG Qin-rong^{1, 2}, TANG Jian-xin^{1, 2}, HU Hai^{1, 2}, ZHANG Wei-zhong^{1, 3}

(1. College of Resource and Environmental Sciences, Chongqing University, Chongqing 400030, China;
2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University,
Chongqing 400030, China;
3. School of Safety Science and Administration, Zhongnan University of Economics and Law,
Wuhan 430074, China)

Abstract:In light of the severe deformation and destruction of the district raise tunnel in the mining area at the northern part of the Lubanshan colliery, by the theoretic analysis and numerical simulation, both the mining stress distribution in seams group and the deformation and destruction mechanism of floor district raise were investigated. The results show that, at the maximum vertical distance of 40 m, the abutment stress has an influence on the recovery of 2# and 3# coal seam and 8# coal seam at distance of 30 m. As a result, the recovery of 8# is rather than those of 2# or 3# coal seam, which contributes to the deformation and destruction of the district raise surrounding rock. The major factors affecting the abutment stress include the mining depth, mining height, residual gob space, adjacent working faces and short spacing coal seam recovery.

Key words:coal seams group; stress distribution; district raise; surrounding rock deformation and destruction; abutment stress