采动围岩活动与工作面瓦斯涌出关系  

Relationship Between Mining Induced Surrounding Rock Movement and Gas Emission in Working Face

作　　者：李化敏[1] 王文[2] 熊祖强[2] 

机构地区：[1]中国矿业大学资源与安全工程学院,北京100083 [2]河南理工大学能源科学与工程学院,河南焦作454010

出　　处：《采矿与安全工程学报》2008年第1期11-16,共6页Journal of Mining & Safety Engineering

基　　金：河南省自然科学基金项目(0211051300);河南省重点攻关项目(0623021400)

摘　　要：结合平煤集团13矿己二12071工作面实际条件,对支架支护阻力、超前支承压力以及工作面瓦斯体积分数进行了实时监测,分析了采动过程与瓦斯涌出之间的关系.结果表明,随工作面矿压显现增大,瓦斯体积分数同步增大,压力降低,瓦斯体积分数随之下降.来压期间工作面前方瓦斯煤体"卸压增流",瓦斯涌出量增大;采空区冒落裂隙带内呈现含高瓦斯多孔多连通空间特性,来压过程对多孔多连通空间产生挤压或冲击和挤压综合作用,受冲(挤)扩散的高瓦斯气流向回采工作空间流动,导致工作面瓦斯体积分数增高.According to the practical condition of Ji2-12071 working face in No. 13 coal mine, Pingdingshan Coal Group, the support resistance, advance abutment pressure and gas density of working face were monitored timely and the relationship between mining induced surrounding rock movement and gas emission analyzed. The result indicates that the gas density increases with the increase of ground pressure of working face and decrease with the reduction of ground pressure. During the weighting period, there is a pressure-relief and flow increase effect in the front of working face, resulting in an increase of gas emission. In addition, multipore connected spaces with the high-content of gas in caving and fracturing zones of goaf were formed and these spaces may be compressed or impacted during the weighting period, making the gas flow to the working face, leading to an increase of gas density.

关 键 词：采动应力 瓦斯涌出量 支承压力 周期来压 采动裂隙场 

分 类 号：TD712[矿业工程—矿井通风与安全]