大倾角煤层分层综采再生顶板应力分布规律研究  

Study on stress distribution law of regenerated roof in fully-mechanized layered mining of steeply dipping coal seam

作　　者：池小楼 杨科[1,2,3] 付强 魏祯[1,3] 张寨男 CHI Xiaolou;YANG Ke;FU Qiang;WEI Zhen;ZHANG Zhainan(State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan,Anhui232001,China;Institute of Energy,Hefei Comprehensive National Science Center,Hefei,Anhui230031,China;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]合肥综合性国家科学中心能源研究院,安徽合肥230031 [3]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》2022年第5期891-900,共10页Journal of Mining & Safety Engineering

基　　金：安徽理工大学高层次引进人才科研启动基金项目(2021yjrc10);安徽高校自然科学研究重点项目(KJ2021A0456);国家自然科学基金重点项目(51634007)。

摘　　要：为研究下分层回采诱导再生顶板二次破断及应力重分布特点,结合潘北矿1212(3)工作面地质与工程条件,采用基于煤系地层赋存禀赋精细化建模技术的数值模拟,并结合物理模拟与现场实测,分析了大倾角煤层分层综采再生顶板应力集中、释放与转移演化特征,揭示了再生顶板破断应力驱动机制。研究结果表明:随下分层回采,采空区再生顶板破断岩块逐渐压实,应力恢复,再生顶板竖向应力释放拱高度降低;下分层倾向与走向再生顶板与煤柱形成高应力束组成的应力拱,应力拱内外岩体主应力低于应力拱中岩体主应力;应力拱在再生顶板中的岩层层位距采空区高度为30 m;结合相似物理模拟,悬臂梁与铰接岩梁破断主要发生在应力拱内;应力拱随下分层回采自工作面倾向上部向其下部发育,具体为倾向两侧上部最大主应力集中范围广、岩层层位高,中部次之,下部最小。现场矿压实测较好的验证了数值模拟结果。In order to study the characteristics of secondary fracture and stress redistribution of regenerated roof induced by the lower layered mining,combined with the geological and engineering conditions of 1212(3)working face in Panbei mine,the stress concentration,release and transfer of regenerated roof in the fully mechanized layered mining of large dip coal seam are investigated by numerical simulation based on fine modeling technology of occurrence endowment of coal measure strata,physical simulation and field measurement.The characteristics of absorption and transfer evolution reveal the driving mechanism of fracture stress of the regenerated roof.The results show that with the lower layered mining progressing,the broken rock mass of regenerated roof in goaf is gradually compacted,the goaf load increases and the vertical stress release arch height of the overlying regenerated roof decreases.The stress arch composed of high stress beam is formed in the regenerated roof and coal pillar,and the principal stress of rock mass inside and outside the stress arch is lower than that in the stress arch.The height of the rock stratum of the stress arch in the regenerated roof is 30 m away from the goaf.Combined with physical simulation,the fracture of cantilever beam and hinged rock beam mainly occurs in the stress arch.The stress arch tends to develop from the upper part of the working face to the lower part with the lower layered seam mining.Specifically,the stress concentration range in the upper part along the coal seam is wide,followed by the middle part and the lowest in the lower part.The numerical simulation results are well verified by the field ground pressure measurement.

关 键 词：大倾角煤层 分层开采 采空区 采动应力 应力拱 

分 类 号：TD325[矿业工程—矿井建设]