掘进工作面煤层渗透率变化对瓦斯涌出量的影响分析  

Analysis on Influence of Seam Permeability Variation in Heading Face on Gas Emission

作　　者：候三中[1] 刘德民[2] 李金岭[2] 

机构地区：[1]河南理工大学万方科技学院,河南焦作454000 [2]唐山马家沟矿业有限责任公司,河北唐山063021

出　　处：《矿业安全与环保》2010年第5期7-10,共4页Mining Safety & Environmental Protection

摘　　要：利用有限差分法对掘进工作面巷道周围瓦斯压力梯度的分布进行了数值模拟,通过考察和对比在渗透率恒定不变和考虑巷道周围一定范围内围岩应力发生变化而引起渗透率变化时煤层巷道瓦斯涌出量的变化和分布,得出结论:在煤壁暴露初期,由于工作面掘进引起渗透率的变化对巷道瓦斯涌出量影响较大,随着暴露时间增长影响越来越小。但是由于瓦斯涌出量的大小与煤壁处渗透率成正比,所以在计算掘进巷道瓦斯涌出量时,必须考虑渗透率为变量对瓦斯涌出量大小的影响。The numerical simulation was carried out on the distribution of gas pressure gradient around the roadway in heading face by using the finite difference method. Through the investigation and comparison of the variation and distribution of gas emission in both cases that the infiltration rate keeps constant and the stress variation around the roadway causes the infiltration rate to be changed,it came to the conclusion that the variation of infiltration rate caused by drivage had greater influence on the gas emission from roadway in the initial exposure period of coal wall,but the influence got smaller and smaller with the increase of exposure time. Since the gas emission is directly proportional to the infiltration rate of coal wall,the influence of the variation of the infiltration rate on gas emission should be taken into consideration while calculating the gas emissiom from roadway.

关 键 词：掘进工作面 煤层渗透率 数值模拟 瓦斯涌出量 瓦斯压力 

分 类 号：TD712.5[矿业工程—矿井通风与安全]