大倾角煤层分层综采再生顶板破断规律研究  

Study of caving pattern of regenerated roof in fully-mechanized slicing mining of steeply dipping coal seam

作　　者：池小楼 杨科[1,2,3] 刘文杰 付强[1,2] 魏祯[1,2] CHI Xiao-lou;YANG Ke;LIU Wen-jie;FU Qiang;WEI Zhen(State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan,Anhui 232001,China;School of Mining Engineering,Anhui University of Science and Technology,Huainan,Anhui 232001,China;Institute of Energy,Hefei Comprehensive National Science Center,Hefei,Anhui 230031,China)

机构地区：[1]安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南232001 [2]安徽理工大学矿业工程学院,安徽淮南232001 [3]合肥综合性国家科学中心能源研究院,安徽合肥230031

出　　处：《岩土力学》2022年第5期1391-1400,共10页Rock and Soil Mechanics

基　　金：安徽高校自然科学研究重点项目(No.KJ2021A0456);安徽理工大学引进人才科研启动项目(No.2021yjrc10);国家自然科学基金重点项目(No.51634007)。

摘　　要：针对大倾角厚软煤层下分层安全综采问题,结合淮南矿区潘北煤矿1212(3)大倾角厚软煤层分层综采下分层工作面地质与工程条件,综合运用基于数字散斑、声发射监测与分布式光纤传感技术的物理模拟试验、基于煤系地层赋存禀赋建模技术的数值模拟试验相结合的研究手段,开展了下分层开采再生顶板破断倾向分区演化、再生岩体变形声发射能量与光纤应变响应规律及应力分布特征研究。结果表明:再生顶板破断由其破断岩块滑移、低中位悬臂梁和高位铰接岩梁断裂组成,双梁破断是引起下分层支架失稳的关键所在。下分层中上部双梁破断声发射能量呈高度聚集且持续时间短,光纤感知低位悬臂梁破断且中上部光纤应变峰值高,下分层中上部是支架与再生顶板稳定性控制的重点区域。下分层下部再生顶板破断岩块充填密实且粒径小,是架间与架前岩块漏冒多发区域。下分层再生顶板中形成高应力组成的应力拱,距采空区高度约30 m,双梁破断主要发生在拱内,拱中岩体破断对支架具有一定的冲垮作用。To solve the problem of safe fully-mechanized mining in steeply dipped thick soft coal seam,physical modelling integrated with digital image correlation(DIC),acoustic emission(AE)and distributed optical fiber sensing(DOFS)technology,and the numerical simulations were conducted in this study.Based on the geological and engineering conditions of the 1212(3)working face of Panbei Mine in Huainan mining area,the evolution of the fracture tendency zone of the regenerated roof during the lower slice mining was studied.The acoustic emission characteristics and the fiber strain responses of the regenerated rock mass were deeply investigated.The results show that the caving of regenerated roof consists of rock slippage,fracture of the low and mid-level cantilever beams and high-level articulated rock beams.Furthermore,the fracture of the double-beams is the key to the instability of the support in lower slice.The acoustic emission energies from the upper and middle parts of the lower slice are highly concentrated with short durations.Moreover,the fiber strain results indicate that the breakage occurs in the low cantilever beam and the high strain peak appears in the upper and middle parts.The middle and upper parts of the lower slice are the key areas for the stability control of the support and the regenerated roof.The lower part of the regenerated roof is densely filled with fragmented rock with much smaller grain size,where the rock leakage between and in front of the shelf is commonly encountered.A high-stress arch is formed in the regenerated roof of the lower slice,which is approximately 30 m in height from the goaf.The fracture of the double-beams mainly occurs in the arch,and the rock breakage in the arch has a certain collapse effect on the support.

关 键 词：大倾角煤层 下分层开采 围岩破坏 相似模拟 数值模拟 

分 类 号：TD325[矿业工程—矿井建设]