华胜煤矿房柱群下巷道非对称变形破坏机理及控制技术
Asymmetric deformation mechanism and control technology of roadway under room-pillar group in Huasheng coal mine
刘海雁 1左建平 2张春旺 1吴凯俊 1雷博1
作者信息
- 1. School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China
- 2. School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;State Key Laboratory of Coal Resources and Safe Mining(China University of Mining and Technology(Beijing)),Beijing 100083,China
- 折叠
摘要
在近距离煤层开采中,下煤层巷道的稳定性对于整个矿井的安全生产至关重要.因此,本文以兼并重组矿井华胜煤矿为工程案例,基于上煤层巷道房柱群采空区底板应力分布规律,研究了下煤层巷道的变形破坏机理及控制技术.首先,详细分析了华胜煤矿下煤层巷道的地质概况、围岩力学参数和原有支护方案,并基于现场钻孔窥视结果得到了下煤层巷道顶板房柱的具体位置,分析了下煤层巷道的非对称变形机理.然后,运用半无限平面理论计算得到了上煤层巷道房柱群采空区底板的应力分布规律.结果表明,上煤层中房柱群的不对称分布导致下煤层巷道顶板应力分布不均匀,从而引发了下煤层巷道的非对称变形,且越靠近上煤层房柱群中的煤柱,变形越大.基于此,进一步通过数值分析和现场应用对下煤层巷道位置及支护方案进行了优化和验证.华胜煤矿下煤层巷道在优化后的巷道位置及支护方案控制下整体并未出现非对称大变形.本研究结果对类似工程地质条件的下煤层巷道支护方案设计具有指导意义.
Abstract
The roadway stability of the lower coal seam(LCS)is a huge challenge to mine safety in close-distance coal seams.Herein,the floor stress distribution law of the upper coal seam(UCS)and the layout and control for the roadway in the LCS were studied based on a well-grounded engineering case of the Huasheng coal mine.First,the geological situation,rock mass parameters,and support scheme for the roadway were presented in detail.The asymmetric deformation mechanism of the roadway was discussed based on the data obtained from field observation,and the location of goaf in the UCS was determined using the images captured using borehole optical televiewer.Furthermore,a mechanical calculation model for the room-pillar group floor stress was established,and the floor stress distribution law of the room-pillar group goaf was analyzed using the semi-infinite plane theory.The results indicate that uneven stress under room-pillar group floor resulted in asymmetric deformation,with larger deformation closer to the coal pillar in the LCS.Then,the location and the support scheme for the roadway in the LCS were optimized and verified by numerical analysis and field application.Consequently,the results indicate that the roadway can be relatively well controlled.
关键词
房柱群/非对称变形/底板应力分布/半无限平面理论/现场应用Key words
room-pillar group/asymmetric deformation/floor stress distribution/semi-infinite plane theory/field application引用本文复制引用
基金项目
National Natural Science Foundation for the Distinguished Young Scholars of China(52225404)
Beijing Outstanding Young Scientist Program,China(BJJWZYJH01201911413037)
China Scholarship Council(202206430036)
Fundamental Research Funds for the Central Universities,China(2022YJSLJ02)
出版年
2023
NETL
NSTL
维普
万方数据