基于偏微分方程的钻孔抽采瓦斯数值模拟  

Numerical simulation of borehole gas drainage based on partial differential equation

作　　者：梁新潮 

机构地区：[1]山西离柳焦煤集团有限公司,山西吕梁033000

出　　处：《内蒙古煤炭经济》2018年第22期1-2,94,共3页Inner Mongolia Coal Economy

摘　　要：钻孔瓦斯抽采对于煤矿瓦斯防治、保证工作面安全生产具有重要意义。以山西郭庄煤矿为实验矿井,基于偏微分方程,对COMSOL进行二次开发,对其钻孔瓦斯抽采进行数值三维图像模拟。研究结果表明,越近钻孔中心位置,瓦斯压力下降值和下降率越大,钻孔瓦斯抽采初始阶段,瓦斯压力下降快。随着时间的推移,下降的速率逐渐下降;随着时间的推移,煤层孔隙率逐渐下降;随着时间的推移,有效抽采半径逐渐增大,最终趋于稳定值。同时,钻孔直径越大,其钻孔抽采半径也越大。The borehole gas drainage in coal mine is of great significance to the prevention and control of coal mine gas and the safety of working face.Taking GUOZHUANG Coal Mine in Shanxi Province as the experimental mine,based on partial differential equation,the secondary development of COMSOL is carried out.The gas drainage of borehole is simulated by numerical three-dimensional image.The results show that the closer to the center of the borehole,the greater the value and the rate of decrease of gas pressure is.The gas pressure decreases rapidly in the initial stage of gas extraction from borehole,and with the passage of time,the decreasing rate of gas pressure decreases gradually,and with the passage of time,the gas pressure decreases rapidly.The porosity of coal seam decreases gradually,and with the passage of time,the effective extraction radius increases gradually,and finally tends to stable value.At the same time,the larger the diameter of borehole,the larger the extraction radius of borehole.

关 键 词：煤矿安全 瓦斯抽采 顺层钻孔 数值模似 

分 类 号：F406.3[经济管理—产业经济] TD712[矿业工程—矿井通风与安全]