基于大气压力的工作面瓦斯异常涌出规律分析

Analysis of Abnormal Gas Emission in Working Face Based on Atmospheric Pressure

针对山西某矿2上01工作面回采过程中出现的瓦斯异常涌出情况,通过理论分析与现场实测获得工作面瓦斯异常涌出规律,研究表明矿区地表大气压力存在日变化与年变化,1 d内大气压符合正弦函数变化规律,最大值出现在凌晨3:00—5:00,最小值出现在13:00—15:00,最大差值3.1 h Pa;1年内平均大气压冬高夏低,最大差值8 h Pa。矿区地表大气压力与采空区绝对瓦斯涌出量呈反比例对应关系,且瓦斯涌出滞后于大气压变化1~2 h。通过采取顶板瓦斯道抽采负压动态调整与上隅角明管抽采综合技术措施,降低了极端天气条件下采空区瓦斯异常涌出数量与强度,保障工作面安全生产。

Aiming at the abnormal emission of gas in the mining of 2S01 working face in Shanxi povince,the gas emission anomaly in the working face was obtained by theoretical analysis and field measurement.The results show that there are diurnal variations and annual changes in the surface atmospheric pressure in the mining area.The maximum atmospheric pressure is in the range of 13：00 to 15：00,the maximum difference is between 3：00 and 5：00,and the maximum difference is 3.1 h Pa;average annual atmospheric is winter high summer low,the maximum difference is 8 h Pa.The surface atmospheric pressure in the mining area is inversely proportional to the absolute gas emission in the goaf,and the gas emission is lagging behind atmospheric pressure for 1 to 2 hours.By taking the dynamic adjustment of the negative pressure of the roof gas channel and the comprehensive technical measures for the extraction of the upper corner of the pipe,the quantity and intensity of the gas emission in the goaf area under extreme weather conditions are reduced to ensure the safe production of the working face.