突出矿井掘进工作面瓦斯渗流模型及数值模拟

摘要

In order to control the gas emission of the tunnel under the influence of the hanging ear drill field.The gas migration mathe⁃matical model is build based on considering the adsorption,diffusion and seepage,the effect of Klinkenberg.The simulation software of the hanging ear drilling field gas flow law is analyzed by using COMSOL multiphysics.The results show that with increasing of extraction time,borehole increases gradually, drill field around the coal gas pressure changes and borehole spacing has a directly relationship, hanging ear drill field drainage can effectively reduce the coal gas emission in the roadway exposed walls.%为了掌握挂耳钻场抽采影响下掘进巷道瓦斯涌出情况，指导矿井的巷道掘进工作，建立了综合考虑解吸、渗流、扩散、Klinkenberg效应的瓦斯运移数学模型，利用数值模拟软件对挂耳钻场瓦斯流动规律进行了数值分析。结果表明，随着抽采时间的增加，钻孔影响范围逐渐增大，钻场周围煤体瓦斯压力的变化与钻孔间距有直接关系，采用挂耳钻场的瓦斯抽采方式能够有效降低巷道暴露煤壁的瓦斯涌出量。