9-209中厚煤层工作面沿空留巷切顶卸压技术研究

Research on Roof Cutting and Pressure Relief Technology of Gob Side Entry Retaining in the 9-209 Medium Thick Coal Seam

为阻止采空区上覆岩层的应力传递,降低回采应力对留巷段顶板破坏作用,店坪煤矿9-209工作面实施以采空区侧预裂爆破、切顶卸压、支护阻力控制构成的中厚煤层无煤柱沿空留巷开采技术,结合理论分析、预裂爆孔窥视和工程实践等方法,证实了留巷围岩的稳定性,取得了显著应用成效。

In order to prevent the stress transmission of overlying strata in goaf and reduce the damage effect of mining stress on the roof of retained roadway section,the 9-209 working face of Dianping Coal Mine implements the gob side presplitting blasting,roof cutting pressure relief,support resistance control as the composition of medium thick coal seam no pillar gob side entry retaining mining technology.Combined with theoretical analysis,presplit hole peeping and engineering practice,the stability of surrounding rock of retained roadway is confirmed,and remarkable application effect is achieved.