陶二矿切顶卸压沿空留巷技术研究与应用

Research and application of gob-side entry retaining technology with roof cutting and pressure relief in Tao'er Mine

为缓解采掘接替紧张、进一步提高煤炭资源回收率,陶二矿于1223面实施沿空留巷。针对该面厚硬砂岩顶板,提出了“超前强化预裂段顶板、定向预裂爆破结合留巷段采空侧补强”一整套综合切顶卸压沿空留巷技术路线,制定了1223面皮带巷切顶卸压沿空留巷具体实施方案,形成了一套适合厚硬砂岩顶板条件的深孔定向切缝爆破参数及超前预裂段、后方留巷段支护方案。现场监测结果表明:爆破切顶后巷道顶板能按预定方向切缝,切顶效果良好;切顶过程中,巷道备修段围岩变形率较小;推采后,留巷支护效果良好,达到了留巷的目的。

In order to alleviate the shortage of mining and further improve the recovery rate of coal resources,the gob side entry retaining construction technology was implemented in No.1225 Face of Tao'er Mine.Based on the geological mining conditions of this face,the comprehensive technology of roof cutting and pressure relief gob side entry retaining was put forward,which was"advanced strengthening pre splitting support+directional pre splitting blasting+reinforcement support of roadway retaining section behind working face".The specific implementation scheme of roof cutting and pressure relief gob side entry retaining of 1225 face leather belt roadway was formulated,and the blasting parameters of deep hole directional cutting seam in roadway roof were determined.The field monitoring results showed that the roadway roof can cut the seam according to the predetermined direction after blasting cutting,and the cutting effect was good;in the process of roof cutting,the deformation rate of surrounding rock in the roadway repair preparation section was small;after pushing mining,the effect of retaining roadway support was good,and the purpose of retaining roadway was achieved.