摘要
针对崔家寨矿近距离煤层群开采,应用关键层理论并结合离散元数值模拟,研究了底层1#煤层首采面采场覆岩结构及运动规律。结果显示:E12101工作面基本顶初次来压步距为59 m,周期来压步距为24 m。上覆5#、6#2层煤的开采,起到一定的卸压作用,应力向底层传递较快,随着工作面的推进,工作面前方水平应力有增大的趋势,而垂直应力会减弱,工作面超前支承压力影响范围为30 m左右,在工作面前方10 m左右较强烈。
For mining in closed distance seam group of Cuijiazhai Mine,overburden structure and motion law in the 1st working face of bottom layer coal was studies with the application of the key strata theory and numerical simulation of discrete element.Result showed that：in E12101 face,the first weighting interval of main roof is 59 m while the cycle weighting interval is 24 m.As the influence of mining above two layers（5th,6th）,the stress passed to bottom layer more fast which relieved the pressure.With the advance of working face,the horizontal stress of forehead presented the tendency of increase while the vertical stress decrease,the influence circle of abutment pressure is about 30 m,which is stronger ahead about 10 m from working face.
出处
《中州煤炭》
2010年第11期9-12,共4页
Zhongzhou Coal
关键词
煤层群
关键层
数值模拟
应力分布
支承压力
coal seam group
key strata
numerical simulation
stress distribution
bearing pressure
