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.
出处
《采矿与安全工程学报》
EI
北大核心
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)
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
mining-induced stress
gas emission
abutment pressure
periodic weighting
mining-induced fissure field
