关键词: 近距离煤层, 采空区下, 巷道掘进, 锚杆支护, 效果评价

Abstract: Under the engineering background of NO.11 coal seam entry tunneling in Pingshuo mining area, the complete technology in roadway supporting and its practice experiments under the gob of close coal seams were described in detail. Based on the results of geo-mechanics test, anchor tests in roadway surroundings, theory analysis of bolting support in NO.11 coal-seam and so on, some supporting parameters for different distance of coal seam roof were carried out. The traditional conception of steel-frame supporting system for close seam roadway was changed by different bolting support manners, such as bolt and cable, bolt and short-cable, pre-tensioned and full length anchored bolt and so on. The practice showed that bolting support could make the need of roadway supporting under the gob of close coal seam. The supporting manner cancelled steel-frame, reduced labour intensity, and created conditions for improving the speed of tunneling.

Key words: close coal seams, under the gob, roadway excavation, bolting support, supporting effect evaluation