摘要
为研究15206工作面重复采动对上部采空区及岩层的影响,通过数值计算分析了重复开采下的覆岩变形特征,结果表明:开采15206工作面使得上部采空区裂隙带上延15 m,覆岩裂隙总体明显保留,下部煤层开采覆岩裂隙的发展趋势仍按照上部煤层初采的覆岩裂隙趋势发展;上下煤层水平错位开采在错距30 m时会在采空区一侧顶板处形成倾斜的拉应力集中区,最易发生拉裂隙贯通延伸至地表形成地裂缝;重复采动的影响效应取决于上下煤层采空区顶底板裂隙带的空间分布状况,有交叉重叠区域则会导致采空区之间岩层裂隙贯通,扩大初采裂隙带。
In order to study the effect of repeated mining on the upper goaf and rock formations at15206 working face,the overburden deformation characteristics under repeated mining are analyzed through numerical calculations.The results show that the mining of 15206 working face causes the upper goaf to extend 15 m.The overburden cracks are obviously retained on the whole.The development trend of the overburden cracks in the lower coal seam mining still follows the trend of the overburden cracks in the upper coal seam;the horizontal staggered mining of the upper and lower coal seams will form a tilt at the roof on one side of the goaf when the staggered distance is 30 m.Tensile stress concentration areas are most likely to cause cracks to penetrate and extend to the surface to form ground fissures;the effect of repeated mining depends on the spatial distribution of the cracks in the roof and floor of the upper and lower coal mined areas.If there are overlapping areas,repeated mining will occur.The cracks in the rock strata between the mined-out areas are penetrated and the cracked zone of the initial mining is enlarged.
作者
寻博辉
吕义清
XUN Bo-hui;LYU Yi-qing(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《煤炭技术》
CAS
北大核心
2021年第12期15-19,共5页
Coal Technology
基金
山西省自然科学基金资助项目(201701D121015)。
关键词
重复采动
覆岩裂隙
采空区
变形分析
repeated mining
overburden fissure
goaf
deformation analysis
作者简介
寻博辉(1997-),女,山西运城人,硕士,研究方向:环境与灾害地质,电子信箱:2067l90612@qq.com;通信作者:吕义清,电子信箱:493691454@qq.com.
