综放工作面坚硬顶板切顶卸压护巷技术研究

Research on technology of roadway protection by hard roof-cutting and pressure-relief in fully mechanized caving faces

针对锦程煤矿10-205坚硬顶板综放工作面开采引起的采区轨道巷变形与破坏难题,采用理论分析、数值模拟与现场试验相结合的方法对坚硬顶板切顶卸压护巷技术进行了研究。结果表明:原爆破切顶方案卸压效果差,其根本原因在于切顶高度偏小,未能有效阻断上覆岩层应力传递;分析提出了10-205工作面坚硬顶板爆破切顶优化参数,即切顶高度为22.6 m,切顶角度为12°;采用深浅孔联合爆破切顶卸压技术进行了工程应用,采区轨道巷顶底板移近量由856 mm下降至315 mm,两帮移近量由625 mm下降至275 mm,巷道变形得到了有效控制,取得了良好的护巷效果。

Aiming at the problem of deformation and failure of the track roadway in the mining area caused by the mining of No.10-205 hard roof fully mechanized caving face in Jincheng Mine,the method of combining theoretical analysis,numerical simulation and field test was used to study the roof cutting and pressure relief roadway protection technology of hard roof.The results showed that the pressure relief effect of the original blasting roof cutting scheme was poor.The fundamental reason was that the height of the roof cutting was too small to effectively block the stress transfer of the overlying strata.The optimization parameters of blasting roof cutting of hard roof in 10-205 working face were analyzed and put forward,that was,the height of roof cutting was 22.6 m and the angle of roof cutting was 12°.The engineering application of deep and shallow hole combined blasting roof cutting and pressure relief technology was carried out.The roof and floor convergence of the track roadway in the mining area decreased from 856 mm to 315 mm,and the convergence of the two sides decreased from 625 mm to 275 mm.The deformation of the roadway had been effectively controlled and good roadway protection effect has been achieved.