井下直接法测定煤层瓦斯压力数值模拟  

Numerical Simulation of Underground Coal Seam Gas Pressure Measurement by Direct Method

作　　者：赵嵘[1] 齐黎明[2,3] 王伟[4] 张凯[1] 张旭锟 

机构地区：[1]华北科技学院研究生院,北京101601 [2]河北省矿井灾害防治重点实验室,河北廊坊065201 [3]华北科技学院安全工程学院,北京101601 [4]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《煤矿安全》2017年第2期9-12,共4页Safety in Coal Mines

基　　金：中央高校基本科研业务费资助项目(3142015137);国家自然科学基金资助项目(51204070);河北省矿井灾害防治重点实验室开放基金资助项目(KJZH2013K09)

摘　　要：为了研究煤层原始瓦斯压力、煤层渗透率和钻孔暴露时间对测压的影响,以经典渗流力学为基础建立了测压过程中瓦斯在煤层中流动的数学模型;然后通过COMSOL Multiphysics软件对测压过程进行模拟。结果表明:在一定条件下,煤层原始瓦斯压力或者渗透率越大,压降漏斗范围越大,但瓦斯压力平衡时间并不会因此而增加;在一定条件下,钻孔暴露时间越长,压降漏斗范围越大,瓦斯压力平衡时间也越长。To study the influence of original gas pressure of coal seam and permeability and exposure time on measuring pressure,we built the mathematical model of gas flow in coal seam during measurement based on the classical seepage mechanics, and we simulated the measuring pressure procedure through COMSOL Multiphysics. The results show that under certain conditions, the bigger of original gas pressure or permeability in coal seam is, the larger scope of pressure drawdown distribution is, but the time of gas pressure balance will not increase; under certain conditions, the longer of exposure time is, the larger scope of pressure drawdown distribution is and the longer time of gas pressure balance is.

关 键 词：煤层瓦斯压力 直接法 数学模型 数值模拟 压降漏斗 瓦斯压力平衡 

分 类 号：TD712[矿业工程—矿井通风与安全]