Wang T.,University of Science and Technology Beijing |
Wang T.,China University of Mining and Technology |
You S.,University of Science and Technology Beijing |
Pei F.,University of Science and Technology Beijing |
Bai X.,Xinzhouyao Mine Datong Coal Mine Group Co
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2017
Facing frequent coal bumps in the side of invading coal pillar during the stoping of coal seam 11 of Xinzhouyao coal mine, based on tests of physical and mechanical properties of coal and the analysis of occurrence regularity of coal bumps, the genesis of the coal bumps in the side of invading coal pillar and the process of impactive instability of the clamping coal were analyzed through the calculation of stress state of coal pillar, and the danger-relief scheme of blasting method of roof breaking and pressure relief through gas tunnel was made using according to the conditions of coal seam 11 and its roof and floor. The results have shown that the impactive instability of invading coal pillar is relative to the periodic pressure of the working face: the forced caving out of place causes a hard long hanging plate in both sides of the coal pillar, which is the energy source of the impactive instability of coal pillar; the blasting method of roof breaking and pressure relief can efficiently cut the stress transfer of hard long hanging plate to coal pillar: as the monitoring data of the electromagnetic radiation, mine pressure and slight shock have shown, after blasting, the electromagnetic radiation intensity beside the coal pillar reduced by 68%, the stresses of single hydraulic prop reduced by 20%, and the drilling stress reduced by 80%, which effectively lowered the coal bump hazard of the coal pillar. © 2017, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.