风速对突出瓦斯气体逆流运移的影响研究

Research on the Influence of Wind Speed on the Countercurrent Migration of Outburst Gas

为研究突出瓦斯气体在巷道中受风速影响的逆流运移过程,确定井下突出瓦斯气体运移数学模型,以贵州某煤矿一段井下贯通巷道为原型,运用Fluent软件建立几何模型,设定相同工况下,模拟不同风速对突出瓦斯气体逆流运移过程的影响,分析不同时间、不同测点下瓦斯浓度峰值的变化情况,并以鸿辉煤矿为例进行现场验证。研究结果表明:发生突出后巷道内存在瓦斯逆流现象;瓦斯气体在巷道内的影响范围均随着传播距离的增大而增大,瓦斯浓度峰值随时间呈幂函数下降;风速越大,瓦斯气体排出巷道越快,瓦斯浓度峰值越小,距突出点越远,瓦斯浓度到达峰值越慢;经现场放炮验证,模拟结果符合实际。

In order to study the countercurrent migration process of outburst gas in the roadway under the influence of wind speed and to determine the mathematical model,taking a section of underground roadway in a coal mine in Guizhou as a prototype,Fluent software was used to establish a geometric model.Under the same working conditions,the influences of different wind speeds on the countercurrent migration process of outburst gas were simulated.The changes of the peak gas concentration at different time and different measuring points were analyzed,and Honghui Coal Mine was taken as an example for field verification.The research results show that after the outburst,there is a gas countercurrent phenomenon in the roadway.The influence range of gas in the roadway increases with the increase of propagation distance,and the peak value of gas concentration decreases with time in a power function.The higher the wind speed is,the faster the gas is discharged from the roadway,the smaller the peak value of gas concentration is,the farther it is from the outburst point,and the slower the gas concentration reaches the peak value.The field blasting shows that the simulation results are in line with the reality.