石泉煤矿切顶卸压沿空留巷方案

Scheme of gob-side entry retaining by cutting roof to release pressure for Shiquan Coal Mine

在分析切顶卸压沿空留巷技术优势的基础上,结合石泉煤矿19022工作面地质及开采技术条件,提出适用于石泉煤矿的切顶卸压沿空留巷方案:回采巷道超前加强支护选择高强度锚索配合单体液压支柱迈步抬棚;对采空区至超前支护段的巷道顶板实施预裂爆破,构成卸压时的断裂切顶线;工作面后方的沿空留巷采用贴帮丛柱+单体液压支柱抬棚+液压抬棚的形式进行补强支护。矿压监测结果表明,巷道顶板平均下沉量为95 mm,两帮平均移近量为225 mm,符合巷道断面变形要求;巷道支架平均支护阻力为33MPa,符合巷道支护强度要求。

Based on analysis of technical advantages of gob-side entry retaining by cutting roof to release pressure,combined with geological and mining technical conditions of 19022 working face of Shiquan Coal Mine,the scheme of gob-side entry retaining by cutting roof to release pressure for Shiquan Coal Mine was proposed: high-strength anchor with single hydraulic props were selected for advanced reinforcement support of mining roadway;pre-split blasting was carried out on the roof of roadway from goaf to advanced support section to form fracture top cutting line during pressure relief;reinforcement support in the back of the working face adopted the form of sluice column + single hydraulic props lifting shed + hydraulic lifting shed.The results of mine pressure monitoring show that the average subsidence of roadway roof is 95 mm,and the average displacement of the two gangs is 225 mm,which is in line with the deformation requirements of the roadway section;the average support resistance of the roadway supports is 33 MPa,which meets the requirements of roadway support strength.