密集钻孔周围透气性分布规律的模型实验  

Model Experiment of Gas Permeability Distribution Rule around Dense Boreholes

作　　者：易丽军[1] 俞启香[2] 陈庆发[1] 宋春燕[1] 黄业才[1] 

机构地区：[1]广西大学资源与冶金学院,广西南宁530004 [2]中国矿业大学安全工程学院,江苏徐州221008

出　　处：《矿业安全与环保》2009年第6期11-13,共3页Mining Safety & Environmental Protection

基　　金：广西科学基金资助项目(桂科基0663024);高校博士点科研基金项目(20040290510)

摘　　要：密集钻孔抽采瓦斯是防止煤与瓦斯突出的一种区域性和局部性措施，瓦斯抽采率与钻孔间距、煤层的透气性密切相关。用模型实验的方法，在不同载荷作用下，对气体在模型材料中的流动和钻孔周围透气性进行考察，实验表明，气体在模型材料中的流动满足达西定律，近钻孔的测点随着载荷的增加，透气性系数增大，离钻孔较远的测点则减小，卸压区半径为钻孔直径的0．8～1．0倍。Gas drainage by drilling dense boreholes is a regional and local method for the prevention and control of coal and gas outburst.The gas extraction rate depends on the boreholes gap and the gas permeability of the coal seam.Study was made on gas flowing in the model material and the permeability around boreholes under different loading stress through model experiments.The experimental results indicated that the gas flowing in the model material satisfied Darcy's Law,the gas permeability coefficient raises with the increase of the loading stress raised at the measuring points close to the boreholes,conversely,the permeability coefficient reduced at the measuring points far away from the boreholes.The radius of stress releasing zone was about 0.8~1.0 times larger than the borehole diameter.

关 键 词：密集钻孔 透气性系数 分布规律 模型实验 

分 类 号：TD712.621[矿业工程—矿井通风与安全]