天池煤矿103综采工作面瓦斯涌出规律分析

Gas Emission Law Analysis at 103 Fully Mechanized Working Face of Tianchi Coal Mine

针对天池煤矿103工作面的实际条件,采用理论分析与现场实测相结合的方法,分析103工作面煤层瓦斯涌出特征和瓦斯体积分数分布规律,同时分析工作面瓦斯涌出量与日推进度、产量、配风量、开采工序、抽采量、矿山压力的关系。研究表明:沿倾向从进风巷到回风巷瓦斯浓度逐渐增大,但不同位置增加幅度不同;工作面从煤壁至采空区支架尾处瓦斯浓度呈现高、较高、低、较高、高的分布趋势,在煤壁和采空区之间有1个瓦斯最低点;采空区瓦斯随老顶的周期性垮落呈现由小变大、再由大变小的周期性变化趋势。

According to the actual condition of 103 working face, using the methods of theoretical analysis and field measurement, we analyze the emission characteristics and the volume fraction of coal seam gas at fully mechanized working face, and anlyze the relationship between gas emission amount and day advancing amount, yield, wind amount, mining processes, extraction volume, mine pressure. Research shows that gas concentration increases from the intake to the return air roadway along the tendency, but different positions increase differently ; gas concentration presents trend of high, relatively high, low, relatively high, high from coal wall to support tail of goal; there is a gas lowest between coal wall and goaf; goaf gas presents periodic variation trend from small to large with periodic roof caving, and then changes from big to small.