Huajin Coking Coal Co. , Ltd.
School of Mine Safety, North China Institute of Science and Technology
Shaqu No. 2 Coal Mine, Huajin Coking Coal Co. , Ltd.
School of Civil and Resources Engineering, University of Science and Technology Beijing
Yanching Institute of Technology

针对突出易自燃煤层切顶卸压自成巷工程中面临的煤层瓦斯-火协同治理技术瓶颈,以沙曲二矿3402工作面为研究对象,采用了理论分析、数值模拟及现场工程实践相结合的研究方法,研究了突出易自燃煤层切顶卸压关键技术参数,分析了巷道围岩应力、位移场分布特征,探究了在该地质条件下煤层瓦斯-火的协同防控机理,研究结果表明:巷道切顶角度为15°,切割缝长度为6m时,卸压后实体煤侧应力集中区应力峰值最小,且顶板岩层位移最小。留巷段喷涂高分子堵漏材料可切断采空区瓦斯越流通道,使其回风流瓦斯浓度稳定在0.36%~0.41%;优化顶板瓦斯抽采钻孔及采空区埋管参数可实现高效抽采;向采空区内喷洒雾化阻化剂后,其内未检测出自然发火标志性气体,形成了复杂地质条件下“以防为主、防灭结合、高度协同”防控思路及堵-抽-注协同治理技术。

In view of the bottleneck of coal seam gas fire collaborative control technology faced by roof cutting and pressure relief technology in outburst and spontaneous combustion coal seam, taking 3402 working face of Shaqu No. 2 Coal Mine as the research object, the key technical parameters of roof cutting and pressure relief are studied with theoretical analysis, numerical simulation and field engineering practice. The distribution of stress and displacement of roadway surrounding rock is analyzed, and the cooperative control mechanism of coal seam gas and fire is explored. The research results show that, when the cutting angle is 15° and the cutting length is 6 m, the post-cutting peak stress in stress concentration area of solid coal side is minimum, the roof rock mass is stable, and the displacement is the smallest. After spraying polymer plugging material to the retained roadway section, the gas flow passage in the goaf is cut off in time, and the gas concentration in the return air flow stabilizes at 0. 36%~0. 41%. After optimizing the design parameters of roof gas drainage borehole and goaf buried pipe, the goaf gas can be extracted efficiently. After spraying atomization inhibitor into the goaf, no spontaneous combustion symbolic gases is detected. The prevention and control idea is proposed, emphasizing the priority of prevention, while combining extinguishing and prevention in high collaborative degree, and the collaborative control technology of plugging, pumping and injection is formed.

国家自然科学基金面上项目(52074120);国家重点实验室开放基金(GJNY-20-113-17);国家自然科学基金青年基金(52204133)

刘艳红, 程志恒, 张俊虎, 等. 突出易自燃煤层切顶卸压复合灾害治理技术研究 [J]. 煤炭工程, 2023, 55(6): 54-59.