采空区下近距离煤层回采巷道应力分布规律研究  

Study on Stress Distribution Law of Stoping Roadway in Close-Distance Coal Seam Below Goaf

作　　者：曾宇 白瑶[1] 李鹏辉 黄博 韩天宇 窦浩宇 ZENG Yu;BAI Yao;LI Penghui;HUANG Bo;HAN Tianyu;DOU Haoyu(School of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing 100083,China;School of Architecture and Civil Engineering,Anhui Polytechnic University,Wuhu,Anhui 241000,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]安徽工程大学建筑工程学院,安徽芜湖市241000

出　　处：《矿业研究与开发》2023年第2期88-94,共7页Mining Research and Development

基　　金：国家自然科学基金资助项目(51474218);中央高校基本科研业务费专项资金资助项目(2022XJLJ01)。

摘　　要：为探究围岩应力分布规律对煤炭安全开采的影响,针对水峪矿采空区下近距离煤层巷道开挖与工作面回采过程开展数值模拟,对比分析了上层有无采空区情况下围岩垂直应力分布规律,得到了采空区下围岩变形机理,并针对性地提出了控制措施。结果表明:当上层存在采空区时,巷道处的应力场分布情况由“U”形转变成“V”形,巷道两帮的垂直应力更大;回采过程中工作面与巷道的开挖区域形成了“L”形应力释放区,并在交叉部位产生明显的应力集中。工作面回采过程中,其超前支承压力应力集中系数变化范围为1.773~1.829,应力峰值部位距工作面距离为1.5~3.8 m;侧向支承压力应力集中系数变化范围为1.441~1.698,应力峰值部位距工作面距离约为12.5 m。相比无采空区的情况,工作面与巷道处垂直应力更大。研究结果可为巷道位置选择与支护优化提供参考。In order to explore the influence of the surrounding rock stress distribution law on the safe mining of coal, the numerical simulation was carried out for the excavation and mining process of the close-distance coal seam roadway under the goaf of Shuiyu Mine, and the vertical stress distribution law of the surrounding rock with and without the goaf in the upper layer was compared and analyzed, the deformation mechanism of the surrounding rock below the goaf was obtained, and the control measures were put forward pertinently. The results show that when there is goaf in the upper layer, the stress field distribution at the roadway changes from “U” shape to “V” shape, and the vertical stress at the two sides of the roadway is greater. During the mining process, the excavation area of the working face and the roadway forms an “L” shape stress release area, and produces obvious stress concentration at the intersection. During the mining process of the working face, the change range of the stress concentration coefficient of the advanced bearing pressure is 1.773-1.829, the distance between the stress peak and the working face is 1.5-3.8 m, the change range of the stress concentration coefficient of the lateral bearing pressure is 1.441-1.698, and the distance between the stress peak and the working face is about 12.5 m. Compared with the situation without goaf, the vertical stress at the working face and roadway is greater. The research results can provide a reference for roadway location selection and support optimization.

关 键 词：近距离煤层 采空区 应力集中系数 巷道支护 支承压力 

分 类 号：TD353[矿业工程—矿井建设]