瓦斯参数变化对钻孔瓦斯涌出初速度的影响  

Gas parameter variation on the borehole gas emission initial velocity

作　　者：候三中[1] 

机构地区：[1]河南理工大学,河南焦作454000

出　　处：《煤矿现代化》2016年第1期119-121,共3页Coal Mine Modernization

摘　　要：煤巷掘进工作预测煤与瓦斯突出时常常将钻孔瓦斯涌出初速度作为其中一项主要的参数,它与煤层的瓦斯压力、瓦斯含量的大小有关,钻孔长度和直径以及钻孔的位置,导气管的阻力也会对钻孔瓦斯涌出初速度有相当大的影响。本文在钻孔内变化的压力边界条件下解算钻孔附近瓦斯流动时利用有限差分方法、得到钻孔瓦斯涌出量以及速度随时间的变化规律。分析了瓦斯参数对钻孔瓦斯流量的影响。结果表明:煤层透气性系数及煤层瓦斯压力的大小对钻孔瓦斯涌出初速度和瓦斯涌出的时间有较大的影响。Coal roadway work often predict when the borehole gas emission coal and gas outburst as an important parameter of the initial velocity, drilling the initial velocity of gas emission and coal seam gas pressure and gas content related to the size, length and diameter drilling and drilling location of the hole, airway resistance will also drill the initial velocity of gas emission has a considerable impact. In this paper, the dynamic pressure in the borehole boundary conditions solver drilling coal seam gas flow around the finite difference method, get bored, and the gas flow rate variation with time. The influence of parameters on gas drilling gas flows. The results showed that： coal seam permeability coeffi- cient and the size of the coal seam gas pressure on the drilling of gas emission and times the size of the initial velocity greater impact.

关 键 词：瓦斯涌出初速度 钻孔 瓦斯流量 

分 类 号：TD712.52[矿业工程—矿井通风与安全]