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受煤层地质和周围开采扰动的影响,超化煤矿二1煤层在测试煤层相关参数时瓦斯压力和瓦斯含量起伏很大,因此选用基于瓦斯含量的相对瓦斯压力指标法对观测孔进行极限时间瓦斯抽放。根据观测孔相对瓦斯压力的变化对该煤层预抽瓦斯抽放半径进行测定,根据实测效果为该煤层确定合理的瓦斯抽放影响半径和有效半径,从而指导该矿井安全消突工作。
Due to the influence of coal seam geology and surrounding mining disturbance, the gas pressure and gas content of No. 2 coal seam of Chaohua Coal Mine, No. 2 and No. 1, are quite fluctuant when testing relevant parameters of coal seam. Therefore, the relative gas pressure index method based on gas content is adopted to limit the time of gas drainage put. According to the change of relative gas pressure in observation hole, the gas drainage radius of pre-drainage of the coal seam is determined. Based on the measured results, the effective radius and effective radius of gas drainage are determined for the coal seam to guide the safety work of the mine.