古汉山矿沿空巷道应力及瓦斯突出危险性分布
Distribution of Stress and Gas Outburst Hazard of Roadway Along Gob in Guhanshan Mine
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摘要: 为了探明沿空巷道周边煤体的应力分布情况及煤层瓦斯含量变化，运用岩体力学与弹性力学的相关理论，基于古汉山矿15091工作面回风巷的现场试验，对该矿的钻屑量与矿山应力以及瓦斯压力之间的关系进行研究，并根据相关公式计算与对钻屑量的分析得出了卸压区的安全宽度及矿山应力的分布规律：卸压区域的安全宽度为12 m，12～25 m为应力集中区，25 m以后为原始应力区。最后结合沿空掘巷周边煤层内应力值与瓦斯含量变化得出了应力集中区内煤体已发生破坏，并得出巷道预排瓦斯宽度应为15 m以上。Abstract: In order to investigate the stress distribution and the gas content change in the surrounding coal of roadway along gob, we investigate the relation between drilling cuttings weight, gas pressure and ground pressure by using the theories of rock mechanics and elasticity and based on the field experiment in the return airway of 15091 face of Guhanshan Mine. Meanwhile, with the relevant formula and the analysis of drilling cuttings weight, we obtained mine safety width of stress relief zone and distribution of stress; the width of stress relief zone is about 12 m, the location of stress concentration region is from 12 m to 25 m, the location of original stress zone is beyond 25 m. Finally, combined the stress values and the changes of gas content in the coal, the coal in the stress concentration region is damaged, and the pre-exhaust gas roadway width should be 15 m or more.
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