本煤层瓦斯抽放交叉钻孔塑性区分布规律  

Distribution Laws of Crossing Boreholes Plastic Zone in Coal Seam Gas Drainage

作　　者：孙英峰[1] 孙晓元[1,2] 曹家琳[1] 邵晟洋 荣涛[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083 [2]太原科技大学环境与安全学院,山西太原030024

出　　处：《煤矿安全》2014年第10期4-6,共3页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51274206);中央高校基本科研业务费专项资金资助项目(2010YZ05);太原科技大学校青年科技研究基金资助项目(20123009)

摘　　要：应用FLAC3D软件,结合Tecplot软件图像处理功能,通过在距交叉点不同距离做切片的方法,研究了交叉钻孔交叉点附近的塑性区分布规律。研究表明:交叉钻孔抽放本煤层瓦斯时,交叉钻孔的塑性区存在相交的情况。塑性区的相交一般是在距交叉点一定距离后才出现的,而且随着距交叉点距离的增加会出现相交区消失的情况。塑性相交区的大小受交叉钻孔之间的高程差和夹角的影响。塑性相交区大小随高程差的增大而减小,塑性相交区大小随夹角的增大而减小。对于九里山矿埋深煤层,交叉钻孔高程差建议小于6倍钻孔直径。Applying FLAC3D software, combining with Tecplot software image processing functions, by doing slices in different distance from the intersection, the distribution laws of plastic zone near the crossing boreholes intersection was studied. Researches show that when crossing boreholes pumps the coal seam gas, the plastic zone of crossing boreholes intersects under certain conditions. Plastic zone intersects generally only in a certain distance away from the intersection point, and with increasing distance from the crossing point will disjoint. The size of elevation difference and intersection angle between crossing boreholes impacts the size of crossing zone. The size of crossing zone decreases with increasing elevation difference, and decreases with increasing intersection angle. For Jiulishan Mine 244 m depth of coal seam, crossing boreholes elevation difference is suggested less than 6 times of the hole diameter.

关 键 词：瓦斯抽放 本煤层 交叉钻孔 塑性区 相交 高程差 夹角 

分 类 号：TD712[矿业工程—矿井通风与安全]