Mechanism of surrounding rock failure and strata movement in complex goaf of metal mines
SUN Chaoyi，CHEN Congxin，XIA Kaizong，ZHANG Wei
(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，
Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：Taking the east area of Jinshandian iron mine of Wuhan Iron and Steel(Group) Company as a relying project，the engineering geological condition of the mine area and the mining process of the ore body were clarified. The spatial characteristics of surrounding rock failure in complex goaf were analyzed by ground pressure behavior investigation and microseismic fracture monitoring. Combining with the results of three-dimensional numerical simulation，surrounding rock fracture monitoring and roadway failure survey，the failure mechanisms of surrounding rocks in hanging wall and footwall of the mining area were elucidated，and the analysis index of discontinuous deformation of surrounding rock failure(i.e.，failure angle) was proposed based on the plastic failure of rock mass，which was verified by comparing it with the collapse angle index. Furthermore，the strata movement laws in both the plane and profile directions caused by the complex goaf in metal mine were revealed. The results show that the failure of surrounding rock and the ground pressure behavior of roadway are distributed around the goaf. On the plane，the convex shape of the half-moon goaf has a magnifying effect on the failure of the surrounding rocks of its two wings. On the profile，the failure of the haulage roadways in the sublevels has the characteristics of elevation lag. Initially，the failure of the surrounding rock in the goaf is mainly caused by the collapse and caving of the rock mass at its top position. As mining progressed，it develops into the fault-slip-controlled chimney caving failure，and finally expands into the through-slip failure controlled by the rock mass structure. The surrounding rock failure of hanging wall presents the characteristics of toppling-slip failure，while that failure of footwall presents the characteristics of the shear-slip failure tracking the faults and structural surfaces. Moreover，the values and variations of the failure and collapse angles of the surrounding rocks of the hanging wall and the footwall are relatively consistent for various exploration line profiles，and these two angles are approximate to show the first decrease after the tendency to stabilize with the mining process. In addition，the hanging wall goaf(FeI) spreads like a strip，and the failure angles that tends to be stable are approximately the same at different exploration lines，and the larger the inclination angle of the main dominant structural surface，the smaller the stable failure angle. Whereas，the footwall goaf(FeII) is distributed in a half-moon plane shape. The stable failure angle in the middle position of the half-moon is larger compared to its two wings，and this angle decreases with increasing the distance between its location and the middle position. The research results are of great significance for guiding the safety production of the mine and ensuring the normal life of the neighboring residents.
孙朝燚，陈从新，夏开宗，张 伟. 金属矿山复杂采空区围岩破坏及岩层移动机制研究[J]. 岩石力学与工程学报, 2024, 43(3): 670-682.
SUN Chaoyi，CHEN Congxin，XIA Kaizong，ZHANG Wei. Mechanism of surrounding rock failure and strata movement in complex goaf of metal mines. , 2024, 43(3): 670-682.
[1] BRADY B H G，BROWN E T. Rock mechanics：for underground mining[M]. Berlin：Springer Science and Business Media，2006：33–34.
[2] 王田龙，陈从新，夏开宗，等. 基于监测数据的陡倾结构金属矿山下盘岩层移动机制研究[J]. 岩石力学与工程学报，2022，41(7)：1 409–1 426.(WANG Tianlong，CHEN Congxin，XIA Kaizong，et al. Study of footwall ground movement mechanism in the iron mine with steeply dipping discontinuities based on monitoring data[J]. Chinese Journal of Rock Mechanics and Engineering，2022，41(7)：1 409–1 426. (in Chinese))
[3] 王田龙，陈从新，夏开宗，等. 陡倾结构金属矿山采空区围岩破坏机制研究[J]. 岩土力学，2023，44(5)：1 487–1 500.(WANG Tianlong，CHEN Congxin，XIA Kaizong，et al. Failure mechanism of goaf surrounding rock with steeply dipping discontinuities in metal mine[J]. Rock and Soil Mechanics，2023，44(5)：1 487–1 500.(in Chinese))
[4] 刘秀敏，王 月，陈从新，等. 地质结构影响下的金属矿山地压显现机制初探[J]. 岩石力学与工程学报，2022，41(12)：2 451–2 459. (LIU Xiumin，WANG Yue，CHEN Congxin，et al. Preliminary study on the occurrence mechanism of ground pressure in iron mines under the influence of geological discontinuities[J]. Chinese Journal of Rock Mechanics and Engineering，2022，41(12)：2 451–2 459.(in Chinese))
[5] 赵兴东，周 鑫，赵一凡，等. 深部金属矿采动灾害防控研究现状与进展[J]. 中南大学学报：自然科学版，2021，52(8)：2 522–2 538. (ZHAO Xingdong，ZHOU Xin，ZHAO Yifan，et al. Research status and progress of prevention and control of mining disasters in deep metal mines[J]. Journal of Central South University：Science and Technology，2021，52(8)：2 522–2 538.(in Chinese))
[6] CHENG G W，CHEN C X，LI L C，et al. Numerical modelling of strata movement at footwall induced by underground mining[J]. International Journal of Rock Mechanics and Mining Sciences，2018，108：142–156.
[7] XIA K Z，CHEN C X，LIU X T，et al. Assessing the stability of high-level pillars in deeply-buried metal mines stabilized using cemented backfill[J]. International Journal of Rock Mechanics and Mining Sciences，2023，170：105489.
[8] BRUNTON I D，FRASER S J，HODGKINSON J H，et al. Parameters influencing full scale sublevel caving material recovery at the Ridgeway gold mine[J]. International Journal of Rock Mechanics and Mining Sciences，2010，47(4)：647–656.
[9] VILLEGAS T，NORDLUND E，DAHNÉR-LINDQVIST C. Hangingwall surface subsidence at the Kiirunavaara Mine，Sweden[J]. Engineering Geology，2011，121(1/2)：18–27.
[10] 徐 帅，安 龙，李元辉，等. 无底柱分段崩落法多端壁倾角下崩矿步距优化[J]. 东北大学学报：自然科学版，2012，33(1)：120–123.(XU Shuai，AN Long，LI Yuanhui，et al. Optimization of caving space for different angles of end-wall during pillarless sublevel caving[J]. Journal of Northeastern University：Natural Science，2012，33(1)：120–123.(in Chinese))
[11] 夏开宗，刘秀敏，陈从新，等. 程潮铁矿西区地下开采引起的地表变形规律初探[J]. 岩石力学与工程学报，2014，33(8)：1 572–1 588. (XIA Kaizong，LIU Xiumin，CHEN Congxin，et al. Surface deformation in west area of Chengchao iron mine induced by underground mining[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(8)：1 572–1 588.(in Chinese))
[12] 邓洋洋，陈从新，夏开宗，等. 程潮铁矿西区地表塌陷成因分析[J].，岩土力学，2019，40(2)：743–758.(DENG Yangyang，CHEN Congxin，XIA Kaizong，et al. Cause analysis of surface collapse in western area of Chengchao iron mine[J]. Rock and Soil Mechanics，2019，40(2)：743–758.(in Chinese))
[13] 陈龙龙，陈从新，夏柏如，等. 程潮铁矿东区地面塌陷机制及扩展机制初探[J]. 岩土力学，2017，38(8)：2 322–2 334.(CHEN Longlong，CHEN Congxin，XIA Boru，et al. Study on mechanism of formation and expansion of ground caving-in in the eastern Chengchao Iron Mine[J]. Rock and Soil Mechanics，2017，38(8)：2 322–2 334.(in Chinese))
[14] 付 华，陈从新，夏开宗，等. 金属矿山地下开采引起岩体变形规律浅析[J]. 岩石力学与工程学报，2015，34(9)：1 859–1 868.(FU Hua，CHEN Congxin，XIA Kaizong，et al. Analysis briefly about the law of rock deformation caused by underground mining of metal mines[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(9)：1 859–1 868.(in Chinese))
[15] 庞汉松，陈从新，夏开宗，等. 基于监测数据的分段崩落采矿法地表危险变形区边界确定方法研究[J]. 岩石力学与工程学报，2020，39(4)：736–748.(PANG Hansong，CHEN Congxin，XIA Kaizong，et al. Study on the methodology for determining the ground acceptable deformation limit in sublevel caving mining based on monitoring data[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(4)：736–748.(in Chinese))
[16] 张褚强，沈 强，陈从新，等. 程潮铁矿西区分段崩落法开采影响范围和极限角研究[J]. 岩土力学，2021，42(6)：1 713–1 723. (ZHANG Chuqiang，SHEN Qiang，CHEN Congxin，et al. Study on the influence range and limit angle in the west area of Chengchao Iron Mine by sublevel caving[J]. Rock and Soil Mechanics，2021，42(6)：1 713–1 723.(in Chinese))
[17] 宋卫东，赵增山，王 浩. 断层破碎带与采准巷道围岩作用机制模拟研究[J]. 金属矿山，2004，(2)：11–13.(SONG Weidong，ZHAO Zengshan，WANG Hao. Simulation study on interaction mechanism between fault fracture zone and rock surrounding straight work[J]. Metal Mine，2004，(2)：11–13.(in Chinese))
[18] XIA K Z，CHEN C X，WANG T L，et al. Investigation of mining-induced fault reactivation associated with sublevel caving in metal mines[J]. Rock Mechanics and Rock Engineering，2022，55(10)：5 953–5 982.
[19] 杨括宇，陈从新，夏开宗，等. 崩落法开采金属矿巷道围岩破坏机制的断层效应[J]. 岩土力学，2020，41(增1)：279–289.(YANG Kuoyu，CHEN Congxin，XIA Kaizong，et al. Fault effect on the failure mechanism of surrounding rock in metal mine roadway by caving method[J]. Rock and Soil Mechanics，2020，41(Supp.1)：279–289.(in Chinese))
[20] YANG K Y，CHEN C X，SUN Y L. Mining-induced deformation for a haulage drift of the hanging wall at Jinshandian iron mine in China[J]. Frontiers in Earth Science，2023，10：998759.
[21] 宋许根，陈从新，庞厚利，等. 金属矿山采矿推进与地表变形关系研究[J]. 岩土力学，2018，39(增1)：425–436.(SONG Xugen，CHEN Congxin，PANG Houli，et al. Study of relationship between underground mining and surface deformation in metal mines[J]. Rock and Soil Mechanics，2018，39(Supp.1)：425–436.(in Chinese))
[22] XIA K Z，CHEN C X，DENG Y Y，et al. In situ monitoring and analysis of the mining-induced deep ground movement in a metal mine[J]. International Journal of Rock Mechanics and Mining Sciences，2018，109：32–51.
[23] XIA K Z，CHEN C X，LU Z D，et al. Investigation of the ground movement due to underground mining at the Jinshandian Iron Mine in China[J]. Environmental Earth Sciences，2019，78：715.
[24] WANG T L，CHEN C X，XIA K Z，et al. Ground surface deformation in the Hanging Wall of the Jinshandian Underground iron mine in China[J]. Frontiers in Earth Science，2022，10：909466.
[25] 程关文，陈从新，沈 强，等. 程潮铁矿地下开采引起岩层移动机制初探[J]. 岩土力学，2014，35(5)：1 421–1 429.(CHENG Guanwen，CHEN Congxin，SHEN Qiang，et al. Mechanism of rock strata movement caused by underground mining in Chengchao iron mine[J]. Rock and Soil Mechanics，2014，35(5)：1 421–1 429.(in Chinese))
[26] 任伟中，白世伟，孙桂凤，等. 厚覆盖岩层条件下地下采矿的地表及围岩变形破坏特性模型试验研究[J]. 岩石力学与工程学报，2005，24(21)：3 935–3 941.(REN Weizhong，BAI Shiwei，SUN Guifeng，et al. Research on deformation and subsidence characters of ground and surrounding rock induced by underground mining under thick covering terrain by model test[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(21)：3 935–3 941.(in Chinese))
[27] 黄平路，陈从新. 露天与地下联合开采引起岩层移动规律的模型试验研究[J]. 岩土力学，2008，29(5)：1 310–1 314.(HUANG Pinglu，CHEN Congxin. Model test study on rock movement caused by openunderground combined mining[J]. Rock and Soil Mechanics，2008，29(5)：1 310–1 314.(in Chinese))
[28] SVARTSJAERN M，SAIANG D. Discrete element modelling of footwall rock mass damage induced by sub-level caving at the Kiirunavaara mine[J]. Minerals，2017，7(7)：109.
[29] ZHAO J S，JIANG Q，LU J F，et al. Rock fracturing observation based on microseismic monitoring and borehole imaging：In situ investigation in a large underground cavern under high geostress[J]. Tunnelling and Underground Space Technology，2022，126：104549.
[30] ZHAO J S，JIANG Q，PEI S F，et al. Microseismicity and focal mechanism of blasting-induced block falling of intersecting chamber of large underground cavern under high geostress[J]. Journal of Central South University，2023，30：542–554.
[31] 孙朝燚，陈从新，郑 允，等. 基于空间效应的弃渣场边坡稳定性方法探讨[J]. 西南交通大学学报，2019，54(1)：97–105.(SUN Chaoyi，CHEN Congxin，ZHENG Yun，et al. Discussion on slope stability analysis method of abandoned dreg site based on spatial effect[J]. Journal of Southwest Jiaotong University，2019，54(1)：97–105.(in Chinese))
[32] 陈从新，郑 允，孙朝燚. 岩质反倾边坡弯曲倾倒破坏分析方法研究[J]. 岩石力学与工程学报，2016，35(11)：2 174–2 187.(CHEN Congxin，ZHENG Yun，SUN Chaoyi. Research on the analytical approach of rock layered counter-tilt slope flexural toppling failure[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(11)：2 174–2 187.(in Chinese))
[33] SUN C Y，CHEN C X，ZHENG Y，et al. Assessing the stability of cable-reinforced high bedding rock slopes against rotational bi-planar failure[J]. Rock Mechanics and Rock Engineering，2023，56(3)：1 697–1 715.
2024, Vol. 43 
