Abstract：In the process of mining deep coal resources，the occurrence of strong mine earthquakes has become an important reason restricting the safe and efficient production of deep coal mines. The sudden release of strain energy caused by the instant breaking of key strata in deep coal mining is one of the important causes of the mining-induced seismicity. Aiming at the 63upper06 working face of the Dongtan coal mine，the PFC2D numerical software is used to simulate the failure process of overlying key strata in the process of coal mining. The evolution of the mining stress field is also investigated. Utilizing the single generalized displacement thick beam mechanics theory，the mechanical process of multiple key strata is inferred. The results indicate that the overlaying key strata failure types could be classified as suspended failure and overhanging failure. The vertical stress in overlying strata steadily decreases while the horizontal stress rises during mining as a result of the force arching effect of the changing mining stress field. The maximum tensile stress formula，maximum suspension distance，suspension distance of key strata before suspension，and mechanical mechanism of key strata covering deep coal mining are all derived. The research results are of great significance for the advancement of the theory of coal overburden migration in deep mining.
邹俊鹏1，周 祝1，焦玉勇1，张 全1，张 泉2，李振国2. 深部采煤诱发矿震的覆岩关键层破断特征研究[J]. 岩石力学与工程学报, 2024, 43(S1): 3140-3150.
ZOU Junpeng1，ZHOU Zhu1，JIAO Yuyong1，ZHANG Quan1，ZHANG Quan2，LI Zhenguo2. On the fracture characteristics of overlying key strata related to the seismicity under deep coal mining. , 2024, 43(S1): 3140-3150.
[1] 谢和平. “深部岩体力学与开采理论”研究构想与预期成果展望[J]. 工程科学与技术，2017，49(2)：1–16.(XIE Heping. Research framework and anticipated results of deep rock mechanics and mining theory[J]. Advanced Engineering Sciences，2017，49(2)：1–16.(in Chinese))
[2] 何满潮，谢和平，彭苏萍，等. 深部开采岩体力学研究[J]. 岩石力学与工程学报，2005，24(16)：2 803–2 813.(HE Manchao，XIE Heping，PENG Suping，et al. Study on rock mechanics in deep mining engineering[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(16)：2 803–2 813.(in Chinese))
[3] XUE L，ZHANG W， ZHENG Z，et al. Measurement and influential factors of the efficiency of coal resources of China?s provinces：Based on Bootstrap-DEA and Tobit[J]. Energy，2021，221：119763.
[4] 余 露，白光宇，周建伟，等. 呼伦贝尔某煤矿区地境结构特征及其对草原生态恢复的意义[J]. 安全与环境工程，2019，26(4)：29–36.(YU Lu，BAI Guangyu，ZHOU Jianwei，et al. Characteristics of below-ground habitat in a coal mine in Hulun Buir and its significance for prairie ecological restoration[J]. Safety and Environmental Engineering，2019，26(4)：29–36.(in Chinese))
[5] DIETZ M，OREMEK G M，GRONEBERG D A，et al.“What is a rock burst？”Zentralblatt fur Arbeitsmedizin[J]. Arbeitsschutz und Ergonomie，2018，68(1)：45–49.
[6] 李 想，焦玉勇，邹俊鹏，等. 深部采煤覆岩移动和地表沉降研究[J]. 安全与环境工程，2022，29(2)：32–38.(LI Xiang，JIAO Yuyong，ZOU Junpeng，et al. Study on overlying strata movement and ground subsidence in deep coal mining[J]. Safety and Environmental Engineering，2022，29(2)：32–38.(in Chinese))
[7] 钱鸣高，许家林. 煤炭开采与岩层运动[J]. 煤炭学报，2019，44(4)：973–984.(QIAN Minggao，XU Jialin. Behaviors of strata movement in coal mining[J]. Journal of China Coal Society，2019，44(4)：973–984.(in Chinese))
[8] 蒋金泉，王 普，郑朋强，等.高位硬厚岩层下采动裂隙和支承应力演化特征及其对瓦斯运移的影响[J]. 采矿与安全工程学报，2017，34(4)：624–631.(JIANG Jinquan，WANG Pu，ZHENG Pengqiang，et al. Evolution characteristics of mining-induced fracture and abutment stress under high-position hard thick stratum and its effect on gas migration[J]. Journal of Mining and Safety Engineering，2017，34(4)：624–631.(in Chinese))
[9] PAN C，XIA B W，ZUO Y J，et al. Mechanism and control technology of strong ground pressure behaviour induced by high-position hard roofs in extra-thick coal seam mining[J]. International Journal of Mining Science and Technology，2022，32(3)：499–511.
[10] YU M L，ZUO J P，SUN Y J，et al. Investigation on fracture models and ground pressure distribution of thick hard rock strata including weak interlayer[J]. International Journal of Mining Science and Technology，2022，32(1)：137–153.
[11] 张 全，邹俊鹏，吴坤波，等. 深部采煤上覆关键层破断诱发矿震特征研究[J]. 岩石力学与工程学报，2023，42(5)：1 150–1 161. (ZHANG Quan，ZOU Junpeng，WU Kunbo，et al. On the characteristics of mine earthquakes induced by key strata breaking during deep mining[J]. Chinese Journal of Rock Mechanics and Engineering，2023，42(5)：1 150–1 161.(in Chinese))
[12] 李新元，马念杰，钟亚平，等. 坚硬顶板断裂过程中弹性能量积聚与释放的分布规律[J]. 岩石力学与工程学报，2007，26(增1)：2 786– 2 793.(LI Xinyuan，MA Nianjie，ZHONG Yaping，et al. Storage and release regular of elastic energy distribution in tight roof fracturing[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(Supp.1)：2 786–2 793.(in Chinese))
[13] 朱焕春. PFC及其在矿山崩落开采研究中的应用[J]. 岩石力学与工程学报，2006，25(9)：1 927–1 931.(ZHU Huanchun. PFC and application case of caving study[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(9)：1 927–1 931.(in Chinese))
[14] WEI J，WANG S，SONG S，et al. Experiment and numerical simulation of overburden and surface damage law in shallow coal seam mining under the gully[J]. Bulletin of Engineering Geology and the Environment，2022，81(5)：1–17.
[15] 江成浩，刘 浩，周晓华，等. 基于PFC3D的综放工作面裂隙场演化规律数值模拟[J]. 煤矿安全，2019，50(1)：205–209.(JIANG Chenghao，LIU Hao，ZHOU Xiaohua，et al. Numerical simulation study on fissure field evolution laws of fully mechanized caving face based[J]. Safety in Coal Mines，2019，50(1)：205–209.(in Chinese))
[16] 钟江城，周宏伟，赵宇峰，等. 浅埋煤层开采突水溃砂两相流的耦合数值研究[J]. 工程力学，2017，34(12)：229–238.(ZHONG Jiangcheng，ZHOU Hongwei，ZHAO Yufeng，et al. The two-phase flow of water-sand inrush under shallow coal seam mining：a coupled numerical study[J]. Engineering Mechanics，2017，34(12)：229– 238.(in Chinese))
[17] 孙运江，左建平，米长宁，等. 基于覆岩类双曲线移动的含水层“浅保-深储”模型研究[J]. 煤炭学报，2023，DOI：10.13225/j.cnki.jccs. 2022.1223.(SUN Yunjiang，ZUO Jianping，MI Changning，et al. Study on“shallow aquifer preservation-deep aquifer reserve”model based on analogous hyperbolic movement of overburden caused by coal mining[J]. Journal of China Coal Society，2023，DOI：10.13225/j.cnki. jccs.2022.1223.(in Chinese))
[18] WU K，ZOU J，JIAO Y Y，et al. Focal mechanism of strong ground seismicity induced by deep coal mining[J]. Rock Mechanics and Rock Engineering，2023，56(1)：779–795.
[19] LIU X P，LI J P. The research on active boost PFC[J]. Journal of Computational Methods in Sciences and Engineering，2020，15(3)：1–14.
[20] 胡训健，卞 康，葛云峰，等. 基于PFC对含断续节理岩质边坡静力荷载下破坏形式的研究[J]. 安全与环境工程，2017，24(3)：34–42.(HU Xunjian，BIAN Kang，GE Yunfeng，et al. Failure mode of rock slope with non-persistent jointunder static loading based on PFC[J]. Safety and Environmental Engineering，2017，24(3)：34–42.(in Chinese))
[21] 杨胜利，王兆会，蒋 威，等. 高强度开采工作面煤岩灾变的推进速度效应分析[J]. 煤炭学报，2016，41(3)：586–594.(YANG Shengli，WANG Zhaohui，JIANG Wei，et al. Advancing rate effect on rock and coal failure format in high-intensity mining face[J]. Journal of China Coal Society，2016，41(3)：586–594.(in Chinese))
[22] 王云广，郭文兵，白二虎，等. 高强度开采覆岩运移特征与机制研究[J]. 煤炭学报，2018，43(增1)：28–35.(WANG Yunguang，GUO Wenbing，BAI Erhu，et al. Characteristics and mechanism of overlying strata movement due to high-intensity mining[J]. Journal of China Coal Society，2018，43(Supp.1)：28–35.(in Chinese))
[23] 赵高博. 高强度长壁开采覆岩破坏传递特征及其充分采动判据[硕士学位论文][D]. 焦作：河南理工大学，2020.(ZHAO Gaobo. Failure transfer characteristics and sufficient mining criterion of overburden in high strength longwall mining[M. S. Thesis][D]. Jiaozuo：Henan Polytechnic University，2020.(in Chinese))
[24] 王悦汉，邓喀中，吴 侃，等. 采动岩体动态力学模型[J]. 岩石力学与工程学报，2003，22(3)：352–357.(WANG Yuehan，DENG Kazhong，WU Kan，et al. On the dynamic mechanics model of mining subsidence[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(3)：352–357.(in Chinese))
[25] 于 斌，杨敬轩，刘长友，等. 大空间采场覆岩结构特征及其矿压作用机制[J]. 煤炭学报，2019，44(11)：3 295–3 307.(YU Bin，YANG Jingxuan，LIU Changyou，et al. Overburden structure and mechanism of rock pressure in large space stope[J]. Journal of China Coal Society，2019，44(11)：3 295–3 307.(in Chinese))
[26] 李 亮，何富连，许旭辉，等. 近距离煤层应力拱形态与支承压力分布演化研究[J]. 采矿与安全工程学报，2023，40(2)：295–303.(LI Liang，HE Fulian，XU Xuhui，et al. Study on the evolution of stress arch shape and abutment pressure distribution in close distance coal seams[J]. Journal of Mining and Safety Engineering，2023，40(2)：295–303.(in Chinese))
[27] 龚 克. 单广义位移的深梁理论和中厚板理论[J]. 应用数学和力学，2000，(9)：984–990.(GONG Ke. Deep beam theory and medium plate theory with single generalized displacement[J]. Applied Mathematics and Mechanics，2000，(9)：984–990.(in Chinese))
[28] 卜庆为，涂 敏，张向阳，等. 采场厚硬顶板破断失稳与能量聚散演化研究[J]. 采矿与安全工程学报，2022，39(5)：867–878.(BU Qingwei，TU Min，ZHANG Xiangyang，et al. Study on fracture instability and energy accumulation release evolution of thick-hard roof in stope[J]. Journal of Mining and Safety Engineering，2022，39(5)：867–878.(in Chinese))
2024, Vol. 43 
