Shanxi Shiquan Coal Industry Co.
Huadian Coal Industry Group Co.

为研究大直径钻孔抽采技术对采空区内遗煤自燃影响规律,以石泉煤矿30107工作面为试验区,模拟抽采钻孔距工作面不同距离采空区自燃带范围、温度场,分析了自燃带区域和高温核心区域的分布变化,并进行现场实测及验证。结果表明:大直径抽采钻孔距工作面距离增大,采空区自燃带区域增大,最易发生自燃的高温核心区域也增加;数值模拟与实测结果相比,氧气浓度最大差异值为0.7%,温度最大差异值为0.8K,实测值与模拟值相差小,验证了模拟结果的可靠性,为以孔代巷大直径钻孔瓦斯抽采技术的自燃灾害防治提供可靠依据。

In order to study the influence law of large diameter drilling and extraction technology on the spontaneous combustion of residual coal in goaf, the 30107 working face of Shiquan Coal Mine is used as the experimental area to simulate the range and temperature field of the spontaneous combustion zone in goaf at different distances from the extraction drilling holes to the working face. The distribution changes of the spontaneous combustion zone area and the high-temperature core area are analyzed, and on-site measurement and verification are conducted. The results show that as the distance between the large diameter drilling holes and the working face increases, the area of spontaneous combustion zone in the goaf increases, and the high-temperature core area most prone to spontaneous combustion also increases; Compared the measured results and numerical simulation, the maximum difference value in oxygen concentration is 0.7%, and the maximum difference value in temperature is 0.8 K. The difference between the measured and simulated values is small, which verifies the reliability of the simulation results and provides a reliable basis for the prevention and control of spontaneous combustion disasters using the large diameter drilling gas extraction technology of replacing roadways with holes.