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为了增强沿空掘巷巷道的稳定性,提高资源回采率,以大同矿区塔山煤矿8204工作面为研究背景,对沿空掘巷留设区段煤柱的合理宽度进行了研究。首先对特厚煤层综放工作面在沿空掘巷情况下区段煤柱的合理宽度进行了理论分析,然后采用FLAC3D数值模拟软件建立了采空区一侧不同宽度区段煤柱的力学模型,通过模拟结果表明:区段煤柱的宽度在5~10 m时,巷道处于低应力区,支护相对稳定。最后将理论计算和数值模拟相结合,同时参考塔山矿综放工作面矿压显现规律及微地震监测得出的相关结论,综合考虑巷道跨度大、隔绝采空区瓦斯等安全因素,确定了特厚煤层综放工作面沿空掘巷留设区段煤柱的合理宽度为8 m。
In order to enhance the stability of roadway along gob-side entry and improve the recovery rate of resources, the reasonable width of pillars in the gob-side entry retaining roadway was studied based on the 8204 working face of Tashan Coal Mine in Datong Mine. Firstly, the reasonable width of section coal pillar in fully mechanized top coal caving face in gob-side entry under gob-side driving is theoretically analyzed. Then the mechanical model of pillars with different widths on one side of gob area is established by FLAC3D numerical simulation software The simulation results show that when the width of coal pillar in the section is 5 ~ 10 m, the roadway is in the low stress area and the support is relatively stable. Finally, the theoretical calculation and numerical simulation are combined. At the same time, referring to the regularity of mine pressure in fully mechanized top coal caving mining face of Tashan Mine and the relevant conclusions of microseismic monitoring, considering the safety factors such as large span of roadway and gas in mined-out area, The reasonable width of pillars left in the fully mechanized caving mining face with gob-side entry in thick seam is 8 m.