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针对高应力易破碎煤层中煤巷掘进与支护出现的难题,我们采用工程地质调研、数值计算和现场监测等方法对天祝煤矿3200工作面运输巷进行了三维矿压分布的力学分析,结合煤巷现场的变形破坏情况提出了对应的支护方案,并对采用支护优化方案后的煤巷进行了现场变形监测。结果表明:煤巷迎头出现的高应力集中是导致巷道掘进时出现煤爆声、煤体爆裂冲击现象的原因;煤巷顶底板、两帮分别受到较大的水平构造应力和垂直构造应力从而出现较大的变形,尤其煤巷顶板变形最为严重;支护优化方案实施后效果非常明显,煤巷变形量明显减小,巷道更加稳定、安全。
In order to solve the problem of tunneling and supporting in coal seam with high stress and easily broken coal seam, mechanical analysis of 3D mine pressure distribution in 3200 working face of Tianzhu coal mine is carried out by means of engineering geology investigation, numerical calculation and on-site monitoring. Corresponding support schemes are put forward for the deformation and destruction of the coal tunnel site, and on-site deformation monitoring is carried out for the coal tunnel after the optimization scheme is adopted. The results show that the high stress concentration in the heading of coal roadway is the cause of coal burst and coal burst impact during tunneling. The roof and floor of coal roadway and the two gangues are exposed by the larger horizontal tectonic stress and vertical tectonic stress respectively Large deformation, especially in coal seam roof deformation is the most serious; support optimization program after the effect is obvious, the coal lane deformation is significantly reduced, the roadway is more stable and safe.