晋煤集团古书院矿15#煤层工作面直接顶坚硬、底板松软,预留巷道受动压影响变形十分严重。针对这一问题,采用在采掘工作面前方预裂爆破方法将坚硬的直接顶板切断,防止煤柱侧顶板悬顶,改善预留巷道应力状态,同时采用中空注浆锚索对预留巷道围岩进行加固。试验结果表明,预留巷道维护状况得到了根本改善。
In the 1 5#coal seam working face in Gushuyuan Mine of Jincheng Anthracite MinG ing Group,there are some problems:the direct roof is thick and hard;the floor is soft;the reG served roadway is severely deformed because of the dynamic pressure of mining?Therefore,the presplitting blasting method is applied at the head of 1 5# coal seam working face to cut off the diG rect roof,so as to prevent the roof beside coal pillar overhang and improve the stress state of the reserved roadway;and in the meantime,the hollow grouting anchor cable is used to reinforce the surrounding rock of the roadway?The test results show that the reserved roadway is radically imG proved.