摘要
针对恒源煤矿2632工作面大埋深、复合、破碎顶板的工程地质条件,为保证2632机巷顺利切顶进而沿空留巷,首先建立了上覆顶板"悬臂梁+铰接岩梁"的结构模型,通过力学分析、理论计算,确定了切顶卸压下巷内支护强度,相较于小煤柱护巷,切顶能够大幅降低巷内支护强度,覆岩压力向采空区和实体煤深部转移,留巷巷道位于相对低应力区;通过数值模拟,验证了切顶对巷道围岩的卸压效果,确定了切顶的高度和角度。恒源煤矿2632工作面机巷应用切顶卸压自成巷技术后,实现了大埋深破碎顶板的沿空留巷,同时回收了500 m巷道的煤柱,下一工作面可以少掘500 m巷道。
Aiming at the engineering geological conditions for large buried depth, composite and broken roof of 2632 working face in Hengyuan Coal Mine, in order to ensure the roof cutting and gob side entry retaining of the 2632 lane, the combined structural model of cantilever beam and hinged rock beam of the overlying roof was established. Through mechanical modeling and theoretical analysis, the supporting strength of roadway under roof cutting and pressure relief is determined, it is confirmed that the required support strength of the roadway to remain stable is smaller than that of the coal pillar retaining mode, the overburden pressure was transferred to back goaf and solid coal ahead, the roadway formed by roof-cutting was located in the low stress area;the key parameters of the roof-cutting and pressure relief were confirmed by numerical simulation. After the field application of the roof-cutting and pressure relief technology in 2632 working face of Hengyuan Coal Mine, the entry with large buried depth,composite and broken roof was retained successfully, meanwhile, the coal pillars of 500 m roadway were recovered. The next working face can avoid digging 500 m roadway.
引文
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