采场覆岩关键层对岩体变形的影响分析  

Influence of Key Stratum on the Deformation of Rock Mass in the Overlying Rock of Stope

作　　者：施小平[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《矿业研究与开发》2015年第8期77-80,共4页Mining Research and Development

基　　金：国家自然科学基金项目(41306088);安徽省自然科学基金项目(1308085ME61)

摘　　要：关键层是煤层上覆岩体中起控制作用的岩层,其对采空区的变形有重要影响。以实际矿井参数为依托,基于有限元方法对比分析了有、无关键层时采空区竖向沉降情况,得到了采空区顶板最大竖向沉降与工作面推进距离之间的关系;并进一步考察了关键层的位置、关键层的厚度以及多个关键层对采空区上覆岩体变形的影响,分析了主应力偏转及竖向应力的应力扩散现象,分析计算结果表明,关键层的应力扩散能力随其厚度越大,离煤层越近和层数越多而越显著。The key stratum acted a control role in the overlying rock strata,which had great influence on the deformation of mined out area.Based on the actual mining parameters,the vertical settlement of overlying strata with or without key stratum was comparatively studied by FEM.Then,the relationship between the maximum vertical settlement of the goaf roof and the advancing distance of working face was obtained.Furthermore,the influences of the location,thickness and layer number of key stratum on the deformation of mined out area were investigated.The phenomenon of principal stress deflection and the vertical stress diffusion in rock stratum were studied.The analysis results showed that the stress diffusion capacity of the key stratum increased with the increase of its thickness,and the phenomenon was more obvious when key stratum was closer to the coal seam or had agreater number of layers.

关 键 词：煤矿开采 关键层 上覆岩体 竖向沉降 应力扩散 

分 类 号：TD313.1[矿业工程—矿井建设]