金发煤矿开采层瓦斯地质规律研究及危险性预测

Research on Gas Geological Law and Risk Prediction in Jinfa Coal Mine

矿井瓦斯赋存规律及涌出量预测是矿井瓦斯治理的重要理论依据。深入研究分析了金发煤矿瓦斯地质赋存规律控制因素,定性分析了金发煤矿地质构造、煤层上覆基岩厚度、顶底板岩性、水文地质条件等控制要素,确定埋深是影响矿井C_(8)、C_(9)煤瓦斯含量最重要因素。结合矿井实测瓦斯涌出量,预测了煤与瓦斯区域突出危险性。结果表明:煤层埋深与瓦斯含量呈正相关关系;瓦斯压力是判定该矿C_(8)、C_(9)煤瓦斯突出危险性的最重要指标,矿界内煤层瓦斯压力大于0.74MPa的区域具有突出危险性,煤矿的突出危险区主要在矿界西北边靠近矿2坐标点附近。

Mine gas occurrence law and emission prediction are important theoretical basis for mine gas control.This paper deeply studies and analyzes the control factors of gas geological occurrence law in Jinfa coal mine.The control factors such as geological structure,overlying bedrock thickness,roof and floor lithology and hydro geological conditions of Jinfa coal mine are qualitatively analyzed.It is determined that the buried depth is the key factor that affects C_(8) and C_(9) coal gas content.Combined with the measured gas emission,the regional outburst risk of coal and gas could be predicted.The results show that there is a positive correlation between coal seam depth and gas content.Gas pressure is the most important index to determine the risk of gas outburst in C_(8) and C_(9) coal seam,the area with gas pressure greater than 0.74 MPa in the mine boundary has outburst risk.The outburst risk area of coal mine is mainly in the northwest of the mine boundary near the 2 coordinate point of the mine.