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| Study on the evolution law of overburden energy of steeply inclined extra-thick coal seam influenced by mining depth |
| LAI Xingping1，2，JIA Chong1，2，CUI Feng1，2，3，ZHANG Nan1，2，CHEN Jianqiang4，SUN Jingxuan1，2，
ZHANG Suilin1，2，FENG Ganggui1，2
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| (1. College of Energy Engineering，Xi?an University of Science and Technology，Xi'an，Shaanxi 710054，China；2. Key Laboratory of Western Mines and Hazard Prevention of China Ministry of Education，Xi?an University of Science and Technology，Xi'an，Shaanxi 710054，China；3. Key Laboratory of Coal Resources Exploration and Comprehensive Utilization，Ministry of Natural Resources，Shaanxi Coal Geology Group Co.，Ltd.，Xi'an，Shaanxi 710021，China；4. Xinjiang Energy Co.，Ltd.，
State Energy Group，Urumqi，Xinjiang 830002，China)
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Abstract Aiming at the problem of energy change and transmission under the influence of the mining depth in steeply inclined extra-thick coal seam，the physical simulation experiment method and microseismic monitoring equipment were used to analyze the energy distribution and its change characteristics. By cluster analysis of microseismic events，the energy migration path affected by the mining depth is clarified，and the influence law of the mining depth on the elastic energy and the horizontal stress of steeply inclined coal and rock mass is obtained by numerical simulation experiment. The dynamic response characteristics of energy induced by the deep mining are mastered，and the concept and strategy of power disaster prevention and control in steeply inclined extra-thick coal seam are formed. The results show that with the increase of the mining depth of steeply inclined extra-thick coal seam，the peak energy and concentration degree in concentrated areas obviously increase，and the number and proportion of microseismic energy，frequency and large energy events obviously increase. The bent loaded energy storage head of coal and rock is mainly located in the range of the clamping rock pillar in the mining level of fully mechanized top-coal caving face and the two mining stages above it. The energy is mainly conducted along the clamping rock pillar as the dominant path. And in the process of deep mining，the focal center gradually shifts from the middle of the rock pillar to both ends. The peak energy density of steep coal rock mass and the area of high energy accumulation area all increase with the increase of mining depth. When the mining face reaches +400 level，the peak stress increases by about 30.14% compared with +475 level，and the growth rate is about 0.11 MPa/m. With the increase of mining depth，the maximum horizontal stress variation of the single advance of the working face obviously increases，that is，the loading rate of the working face increases under the single advance. Through the comprehensive analysis of simulation experiment and field microseismic measurement，this paper reveals the mechanism of“Target source-predominant conduction path-release terminal”of dynamic disasters in deep mining of steeply inclined extra-thick coal seam，and puts forward the concept of dynamic disaster prevention and control of deep mining in steeply inclined extra-thick coal seam with“Weaken the source-transfer the path-and strengthen the terminal”. The research results provide a scientific basis for the safe mining of steeply inclined extra-thick coal seam.
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| [1] 谢和平，周宏伟，薛东杰，等. 煤炭深部开采与极限开采深度的研究与思考[J]. 煤炭学报，2012，37(4)：535–542.(XIE Heping，ZHOU Hongwei，XUE Dongjie，et al. Research and consideration on deep coal mining and critical mining deep[J]. Journal of China Coal Society，2012，37(4)：535–542.(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]. Chinses Journal of Rock Mechanics and Engineering，2005，24(16)：2 803–2 813.(in Chinese))
[3] 潘俊锋，齐庆新，刘少虹，等. 我国煤炭深部开采冲击地压特征、类型及分源防控技术[J]. 煤炭学报，2020，45(1)：111–121.(PAN Junfeng，QI Qingxin，LIU Shaohong，et al. Characteristics，types and prevention and control technology of rock burst in deep coal mining in China[J]. Journal of China Coal Society，2020，45(1)：111–121.(in Chinese))
[4] 王 博，姜福兴，朱斯陶，等. 深井工作面顶板疏水区高强度开采诱冲机制及防治[J]. 煤炭学报，2020，45(9)：3 054–3 064.(WANG Bo，JIANG Fuxing，ZHU Sitao，et al. Investigating on the mechanism and prevention of rock burst induced by high intensity mining of drainage area in deep mines[J]. Journal of China Coal Society，2020，45(9)：3 054–3 064.(in Chinese))
[5] 许猛堂. 新疆巨厚煤层开采覆岩活动规律及其控制研究[博士学位论文][D]. 徐州：中国矿业大学，2014.(XU Mengtang. Study on movement laws of overlying strata and its control of extra-thick coal seam mining in xinjiang region[Ph. D. Thesis][D]. Xuzhou：China University of Mining and Technology，2014.(in Chinese))
[6] 秦冬冬. 新疆准东矿区缓斜巨厚煤层多分层开采覆岩结构演变机理及控制[博士学位论文][D]. 徐州：中国矿业大学，2020.(QIN Dongdong. Evolution mechanism and control of overburden structure in multi-layered mining of gently inclined thick coal seam in Zhundong mining area，Xinjiang[Ph. D. Thesis][D]. Xuzhou：China University of Mining and Technology，2020.(in Chinese))
[7] 王家臣，杨胜利，李良晖. 急倾斜煤层水平分段综放顶板“倾倒-滑塌”破坏模式[J]. 中国矿业大学学报，2018，47(6)：1 175–1 184. (WANG Jiachen，YANG Shengli，LI Lianghui. Toppling-slumping failure mode in horizontal sublevel top-coal caving face in steeply-inclined seam[J]. Journal of China University of Mining and Technology，2018，47(6)：1 175–1 184.(in Chinese))
[8] HE S Q，SONG D Z，LI Z L，et al. Precursor of spatio-temporal evolution law of MS and AE activities for rock burst warning in steeply-inclined and extremely-thick coal seams under caving mining conditions[J]. Rock Mechanics and Rock Engineering，2019，52：2 415–2 435.
[9] 来兴平，代晶晶，李 超. 急倾斜煤层开采覆岩联动致灾特征分析[J]. 煤炭学报，2020，45(1)：122–130.(LAI Xingping，DAI Jingjing，LI Chao. Analysis on hazard characteristics of overburden structure in steeply inclined coal seam[J]. Journal of China Coal Society，2020，45(1)：122–130.(in Chinese))
[10] 何江，窦林名，曹晋荣，等. 急倾斜特厚煤层水平分段综放开采冲击矿压机理[J]. 煤炭学报，2020，45(5)：1 701–1 709.(HE Jiang，DOU Linming，CAO Jinrong，et al. Mechanism of rock burst in steep and extremely thick coal seam using horizontal section top-coal caving[J]. Journal of China Coal Society，2020，45(5)：1 701–1 709. (in Chinese))
[11] 来兴平，杨毅然，单鹏飞，等. 急斜煤层顶板应力叠加效应致灾特征综合分析[J]. 煤炭学报，2018，43(1)：70–78.(LAI Xingping，YANG Yiran，SHAN Pengfei，et al. Comprehensive analysis of disaster-causing characteristics of roof stress superimposed effect in steeply inclined coal seams[J]. Journal of China Coal Society，2018，43(1)：70–78.(in Chinese))
[12] HE S Q，SONG D Z，HE X Q，et al. Coupled mechanism of compression and prying-induced rock burst in steeply inclined coal seams and principles for its prevention[J]. Tunnelling and Underground Space Technology，2020，98：103327.
[13] 康红普，吴志刚，高富强，等. 煤矿井下地质构造对地应力分布的影响[J]. 岩石力学与工程学报，2012，31(增1)：2 674–2 680. (KANG Hongpu，WU Zhigang，GAO Fuqiang，et al. Effect of geological structures on in-situ stress distribution in underground coal mines[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(Supp.1)：2 674–2 680.(in Chinese))
[14] 齐庆新，雷 毅，李宏艳，等. 深孔断顶爆破防治冲击地压的理论与实践[J]. 岩石力学与工程学报，2006，26(增1)：3 522–3 527.(QI Qingxin，LEI Yi，LI Hongyan，et al. Theory and application of prevention of rock burst by break-tip blast in deep hole[J]. Chinese Journal of Rock Mechanics and Engineering，2006，26(Supp.1)：3 522–3 527.(in Chinese))
[15] SUN H，LIU X L，ZHANG S G，et al. Experimental investigation of acoustic emission and infraredradiation thermography of dynamic fracturing process of hard-rock pillar in extremely steep and thick coal seams[J]. Engineering Fracture Mechanics，2020，226(1)：106845.
[16] LAI X P，CAI M F，REN F H，et al. Study on dynamic disaster in steeply deep rock mass condition in Urumchi coalfield[J]. Shock and Vibration，2015，(3)：1–8.
[17] LAI X P，YANG Y R，CHEN J Q，et al. Control of dynamic hazards induced by mining stress distortion in extremely steep and thick coal seams[J]. Journal of China Coal Society，2016，41(7)：1 610–1 616.
[18] 来兴平，孙 欢，单鹏飞，等. 急倾斜坚硬岩柱动态破裂“声-热”演化特征试验[J]. 岩石力学与工程学报，2015，35(11)：2 285–2 292. (LAI Xingping，SUN Huan，SHAN Pengfei，et al. Acoustic emission and temperature variation in failure process of hard rock pillars sandwiched between thick coal seams of extremely steep[J]. Chinese Journal of Rock Mechanics and Engineering，2015，35(11)：2 285–2 292.(in Chinese))
[19] DAI H Y，LI P，MARZHAN N，et al. Subsidence control method by inversely-inclined slicing and upward mining for ultra-thick steep seams[J]. International Journal of Mining Science and Technology，2022，32(1)：103–112.
[20] 孙 闯，陈东旭，程耀辉，等. 急倾斜煤层坚硬顶板塌落规律及控制研究[J]. 岩石力学与工程学报，2019，38(8)：1 647–1 658.(SUN Chuang，CHEN Dongxu，CHENG Yaohui，et al. Study on collapse rule and control of hard roofs in steeply inclined coal seams[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(8)：1 647–1 658. (in Chinese))
[21] 付建新，宋卫东，杜建华，等. 中深孔开采急倾斜薄矿体采场顶板力学模型及围岩扰动规律研究[J]. 岩石力学与工程学报，2014，33(增1)：3 277–3 283.(FU Jianxin，SONG Weidong，DU Jianhua，et al. Study of stope roof mechanical model and wall rock disturbance law of steeply-inclined thin orebody mining using medium-deep hole[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(Supp.1)：3 277–3 283.(in Chinese))
[22] 崔 峰，贾 冲，来兴平，等. 基于加卸载响应比的冲击地压矿井急倾斜巨厚煤层推进速度研究[J]. 煤炭学报，2022，47(2)：745–761.(CUI Feng，JIA Chong，LAI Xingping，et al. Study on advancing rate of steeply inclined extra-thick coal seam in rock burst mine based on loading-unloading response ratio[J]. Journal of China Coal Society，2022，47(2)：745–761.(in Chinese))
[23] 张东明，郑彬彬，尹光志，等. 采动应力下急倾斜煤层顶板砂岩的力学及渗透特性[J]. 煤炭学报，2017，42(增1)：128–137.(ZHANG Dongming，ZHENG Binbin，YIN Guangzhi，et al. Mechanics and permeability characteristics of steep seam roof sandstone under disturbance stress[J]. Journal of China Coal Society，2017，42(Supp.1)：128–137.(in Chinese))
[24] 姜福兴，XUN L. 微震监测技术在矿井岩层破裂监测中的应用[J]. 岩土工程学报，2002，24(2)：147–149.(JIANG Fuxing，XUN L. Application of microseismic monitoring technology of strata fracturing in underground coal mine[J]. Chinese Journal of Geotechnical Engineering，2002，24(2)：147–149.(in Chinese))
[25] 冯夏庭，肖亚勋，丰光亮，等. 岩爆孕育过程研究[J]. 岩石力学与工程学报，2019，38(4)：649–673.(FENG Xiating，XIAO Yaxun，FENG Guangliang，et al. Study on the development process of rockbursts[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(4)：649–673.(in Chinese))
[26] 崔 峰，杨彦斌，来兴平，等. 基于微震监测关键层破断诱发冲击地压的物理相似材料模拟实验研究[J]. 岩石力学与工程学报，2019，38(4)：803–814.(CUI Feng，YANG Yanbin，LAI Xingping，et al. Similar material simulation experimental study on rockbursts induced by key stratum breaking based on microseismic monitoring[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(4)：803–814.(in Chinese))
[27] 崔 峰，贾 冲，来兴平，等. 近距离强冲击倾向性煤层上行开采覆岩结构演化特征及其稳定性研究[J]. 岩石力学与工程学报，2022，39(3)：507–521.(CUI Feng，JIA Chong，LAI Xingping，et al. Study on the evolution characteristics and stability of overburden structure in upward mining of short distance coal seams with strong burst tendency[J]. Chinese Journal of Rock Mechanics and Engineering，2022，39(3)：507–521.(in Chinese))
[28] 许康生，王维欢，李 英，等. 2016～2017年龙门山地区微震活动的演化:基于对微震目录的模糊聚类分析[J]. 地球物理学进展，2022，37(1)：69–77.(XU Kangsheng，WANG Weihuan，LI Ying，et al. Evilution of microseismic activity in Longmenshan area from 2016 to 2017：based on fuzzy clustering analysis of microseismic catalogue[J]. Progress in Geophysics，2022，37(1)：69–77.(in Chinese))
[29] XIE H P，LI L Y，PENG R D，et al. Energy analysis and criteria for structural failure of rocks[J]. Journal of Rock Mechanics and Geotechnical Engineering，2009，1(1)：11–20. |
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2023, Vol. 42 
