深井采场外错式顶板巷道围岩卸压控制技术研究  

Study on pressure relief control technology of surrounding rock around the staggered roof roadway in a deep longwall face

作　　者：常聚才[1] 齐潮 熊藤根 CHANG Jucai;QI Chao;XIONG Tenggen(School of Mining Engineering,Anhui University of Science and Technology,Huainan,Anhui 232001,China)

机构地区：[1]安徽理工大学矿业工程学院,安徽淮南232001

出　　处：《采矿与安全工程学报》2023年第2期215-223,共9页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(52174105);安徽省重点研究与开发计划项目(202004a07020045);安徽省高校协同创新项目(GXXT-2019-029)。

摘　　要：为了解决深井采场外错式顶板巷道围岩大变形破坏失稳问题,采用数值模拟、理论分析和现场试验等方法对淮南矿区潘三矿17191(1)工作面顶板瓦斯综治巷围岩变形失稳机理及其控制技术进行了研究。结果表明:工作面开采后形成的采动应力沿采空区侧向岩体向巷道围岩内部“转移”是导致巷道围岩变形失稳的主要诱因;结合应力“转移路径”和压力拱理论,推导出卸压“关键层位”高度计算公式,明确了影响顶板巷道矿压显现的“关键层位”为6.5 m厚的中细砂岩,并得到了切落“关键层位”的切顶高度(49.9 m)、角度(10°)和炮孔间距(10 m)。“关键层位”被切断后,巷道左右两帮应力峰值分别减小了42.1%,46.5%,顶底板移近量减小了44.9%,巷道高度由1.8 m增大至3.0 m,断面收缩率减小了34.3%。In order to solve the problem of large deformation and failure instability of the surrounding rock of external-staggered roof roadway in deep mining fields,numerical simulations,theoretical analyses and field experiments are used to study the deformation and instability mechanism and control technology of roof gas comprehensive treatment roadway on 17191(1)working face,Pansan Mine of Huainan Mining Area.The results show that the“transfer”of the mining-induced stress formed after the mining of the working face from the lateral rock mass of the goaf to the internal surrounding rock of the roadway is the main cause of the deformation and instability of the surrounding rock of the roadway.Combined with the stress“transfer path”and pressure arch theory,the calculation formula of the height of the“key strata”is derived,and the medium-fine sandstone with the thickness of 6.5 m in the“key strata”affecting the strata behavior of the roof roadway is clarified.The roof cutting height(49.9 m),angle(10°)and borehole spacing(10 m)of the“key strata”are obtained.After the“key strata”is cut off,the peak stress values of the left and right sides of the roadway decrease by 42.1%and 46.5%,respectively,the roof-floor convergence decreases by 44.9%,the roadway height increases from 1.8 m to 3.0 m,and the section shrinkage decreases by 34.3%.

关 键 词：深井 外错式顶板巷道 失稳机理 卸压控制 压应力拱 

分 类 号：TD801[矿业工程—矿山开采]