缓倾斜中厚煤层切顶卸压沿空留巷支护应用

Application of Retaining Roadway Along Gob by Cutting Top and Relieving Pressure in Gently Inclined Medium-thick Coal Seam

以文家坝一矿110606运输巷沿空留巷为工程背景,采用经验公式计算、数值模拟、工程实践、矿压监测等方法,进行沿空留巷预裂爆破切顶卸压,巷内补强支护方案的设计及应用研究。通过理论分析得到预裂切顶钻孔垂高为7.7 m,孔深为8.0 m时,冒落矸石可将采空区充满,设计详细的巷内补强及采空侧挡矸支护方案。运用FLAC^(3D)数值模拟,研究围岩变形与顶板岩层离层量,结果表明,切顶及巷内补强支护方案可行。工程应用期间进行综合矿压监测,留巷围岩变形量在较低水平,巷道围岩整体稳定,锚索承载能力仍有较大富余,可实现沿空巷道的长期安全稳定,取得较好留巷效果。

Taking gob retaining roadway of 110606 transportation lane in Wenjiaba No.1 Mine as the engineering background,the design and application of the gob retaining roadway pre-splitting blasting for gob removing pressure and the reinforced support scheme in the roadway are carried out by means of empiri⁃cal formula calculation,numerical simulation,engineering practice and mine pressure monitoring.Through theoretical analysis,it is found that when the vertical height of the pre-split cutting top hole is 7.7 m and the hole depth is 8.0 m,the gob is filled by the caving gangue,and the detailed support scheme of reinforcing in the roadway and retaining the waste in the gob side is designed.FLAC^(3D) numerical simulation is used to study the deformation of surrounding rock and the separation amount of roof rock.The results show that the roof cutting and reinforcement support scheme in the roadway is feasible.When comprehensive mine pres⁃sure monitoring is carried out during the tngineering application,the deformation of surrounding rock is at a low level,the surrounding rock of roadway is stable as a whole,and the carrying capacity of anchor cable is still relatively large,which can realize the long-term safety and stability of goaf roadway and achieve good effect of roadway retention.