采动条件下瓦斯抽采钻孔有效范围及瓦斯运移规律

Effective range of gas drainage drilling hole and gas migration law under mining conditions

为了确保矿井的安全抽采,分析了采动条件下瓦斯抽采钻孔有效范围及瓦斯运移规律,理论研究了含瓦斯煤体的有效应力控制方程及煤层瓦斯扩散控制方程,基于此,建立了COMSOL Multiphysics数值模型,分析了距离钻孔不同位置处煤层瓦斯压力分布、不同开采条件下单孔瓦斯抽采瓦斯压力分布以及不同钻孔布置瓦斯压力分布。研究为矿井抽采钻孔参数设计提供了借鉴。

In order to ensure the safe extraction of the mine,the effective range of gas drainage boreholes and the law of gas migration under mining conditions were analyzed,and the effective stress control equation of gas-containing coal and the control equation of coal seam gas diffusion were theoretically studied.Based on this,the establishment the COMSOL Multiphysics numerical model was used to analyze the gas pressure distribution in the coal seam at different locations from the borehole,the gas pressure distribution of single-hole gas drainage under different mining conditions and the gas pressure distribution of different borehole arrangements.The research provided a reference for the design of mine drainage drilling parameters.