“三软”不稳定低透气性煤层开采瓦斯防治技术

Prevention and Control Technology of Gas in “Three Soft” Unsteady Low Permeability Coal Seam

为解决"三软"低透气煤层瓦斯防治方面的难题,以河南平禹煤电四矿三软不稳定低透气性煤层12160采煤工作面为背景,通过相似模拟实验和数值模拟实验对覆岩裂隙演化规律进行研究,并进一步分析卸压瓦斯储集与采场围岩裂隙的演化关系,最终设计出U形通风+高位钻孔抽放瓦斯防治技术。工程实践表明,抽放钻孔位置位于距顶板20~30 m处,可有效杜绝"三软"煤层瓦斯事故。

For working out the preventing and curing problem of ＂three soft＂ ,on the base of Henan Pingyu coal company ＂three soft＂ coal mining, analyzes the relationship between reservoir of relieved gas and overburden fracture by the experiment text on the evolution law of overburden fracture on physical resemble simulation abd numerical simulation, and design the technology about U-shaped ventilation and high level gas drainage finally. Practice shows that draining drill holes above the roof about 20 m to 30 m can put an end to ＂three soft＂ coal gas accidents.