Failure mechanism of tailrace surge chamber in Jinchuan Hydropower Station based on microseismic monitoring and DFN simulation
PI Jintian1, XU Nuwen1*, ZHANG Fengshou2, MAO Haoyu1, ZHOU Xiang1,3, LI Huailiang4, BO Wu5
1. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, Sichuan, China; 2. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 3. Guodian Dadu River Basin Hydropower Development Co., Ltd., Chengdu 610041, Sichuan, China; 4. State Key Laboratory of Geohazard and Prevention and Geoenvirenment Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 5. School of Engineering, Tibet University, Lasa 850000, Xizang, China
Abstract: In order to obtain the failure mechanism of the rock stability under the influence of carbonaceous phyllite band in tailrace surge chamber of Jinchuan Hydropower Station, an insitu microseismic(MS)monitoring system was established. In the construction period, the temporal and spatial distribution of MS events and source parameters were acquired during the excavation in underground caverns. A 3D discrete element numerical model was built. Discrete fracture network(DFN)was added for the weak fault of the underground caverns to build joint fissure, and the displacement and plastic zone distribution were obtained. The synthetic MS events induced by the excavation validated the failure mode and damage of the weak fault. The results suggested that there was a strong correlation between the spatial distribution of insitu MS events and the failure region of rock. The source parameter energy ratio of transverse and longitudinal waves of MS events revealed that the main failure mode of tailrace surge chamber was tension failure. The maximum deformation and plastic zone were obtained by discrete element numerical simulation, and the result was mutually verified with the MS monitoring results. The synthetic MS events generated by DFN-discrete element coupling method revealed the potential failure area of rock, and the result was in good agreement with the actual spatial distribution of MS events.
皮锦添,徐奴文,张丰收,毛浩宇,周相,李怀良,薄雾. 基于微震监测与DFN模拟的金川水电站尾闸室破坏机制[J]. 隧道与地下工程灾害防治, 2024, 6(3): 60-72.
PI Jintian, XU Nuwen, ZHANG Fengshou, MAO Haoyu, ZHOU Xiang, LI Huailiang, BO Wu. Failure mechanism of tailrace surge chamber in Jinchuan Hydropower Station based on microseismic monitoring and DFN simulation. Hazard Control in Tunnelling and Underground Engineering, 2024, 6(3): 60-72.
[1] QIAN Q H, ZHOU X P. Failure behaviors and rock deformation during excavation of underground cavern group for Jinping I Hydropower Station[J]. Rock Mechanics and Rock Engineering, 2018, 51(8): 2639-2651. [2] LI H B, LIU M C, XING W B, et al. Failure mechanisms and evolution assessment of the excavation damaged zones in a large-scale and deeply buried underground powerhouse[J]. Rock Mechanics and Rock Engineering, 2017, 50(7): 1883-1900. [3] 董林鹭, 李鹏, 李永红, 等. 高应力地下厂房顶拱开挖过程围岩力学响应与稳定性分析[J]. 岩石力学与工程学报, 2023, 42(5): 1096-1109. DONG Linlu, LI Peng, LI Yonghong, et al. Mechanical response and stability analysis of surrounding rock mass during roof arch excavation of underground powerhouse under high in situ stress[J]. Chinese Journal of Rock Mechanics and Engineering, 2023, 42(5): 1096-1109. [4] 段淑倩, 冯夏庭, 江权, 等. 高地应力下白鹤滩地下洞室群含错动带岩体破坏模式及机制研究[J]. 岩石力学与工程学报, 2017, 36(4): 852-864. DUAN Shuqian, FENG Xiating, JIANG Quan, et al. Failure modes and mechanisms for rock masses with staggered zones of Baihetan underground caverns under high geostress[J]. Chinese Journal of Rock Mechanics and Engineering, 2017, 36(4): 852-864. [5] 刘健, 朱赵辉, 吴浩, 等. 超大型地下洞室高边墙围岩变形影响特性研究[J]. 岩土力学, 2019, 40(10): 4030-4040. LIU Jian, ZHU Zhaohui, WU Hao, et al. Study of deformation characteristics of the high sidewall surrounding rock in super large undergroundcaverns[J]. Rock and Soil Mechanics, 2019, 40(10): 4030-4040. [6] 董志宏,钮新强,丁秀丽,等.乌东德左岸地下厂房洞室群施工期围岩变形特征及反馈分析[J].岩土力学,2018,39(增刊2):326-336. DONG Zhihong, NIU Xinqiang, DING Xiuli, et al. Deformation characteristics and feedback analysis of surrounding rock of underground powerhouse at left bank of Wudongde Hydropower Station[J]. Rock and Soil Mechanics, 2018, 39(Suppl.2):326-336. [7] HU Z H, WU B B, XU N W, et al. Effects of discontinuities on stress redistribution and rock failure: a case of underground caverns[J]. Tunnelling and Underground Space Technology, 2022, 127: 104583. [8] 马克,唐春安,梁正召,等.基于微震监测的地下水封石油洞库施工期围岩稳定性分析[J].岩石力学与工程学报,2016,35(7):1353-1365. MA Ke, TANG Chun'an, LIANG Zhengzhao, et al. Stability analysis of the surrounding rock of underground water-sealed oil storage caverns based on microseismic monitoring during construction[J]. Chinese Journal of Rock Mechanics and Engineering, 2016, 35(7):1353-1365. [9] XU N W, DAI F, LI B, et al. Comprehensive evaluation of excavation-damaged zones in the deep underground caverns of the Houziyan Hydropower Station, Southwest China[J]. Bulletin of Engineering Geology and the Environment, 2017, 76(1):275-293. [10] 李彪,徐奴文,戴峰,等. 乌东德水电站地下厂房开挖过程微震监测与围岩大变形预警研究[J]. 岩石力学与工程学报,2017,36(增刊2):4102-4112. LI Biao, XU Nuwen, DAI Feng, et al. Microseismic monitoring and large deformation forecasting research during excavation of underground powerhouse at Wudongde Hydropower Station[J]. Chinese Journal of Rock Mechanics and Engineering, 2017, 36(Suppl.2):4102-4112. [11] 赵金帅, 陈炳瑞, 江权, 等. 爆破荷载下白鹤滩大型地下厂房累积损伤机制研究[J]. 岩石力学与工程学报, 2022, 41(5): 916-925. ZHAO Jinshuai, CHEN Bingrui, JIANG Quan, et al. Study on cumulative damage mechanisms of Baihetan large underground powerhouse under blasting loads[J]. Chinese Journal of Rock Mechanics and Engineering, 2022, 41(5): 916-925. [12] HUANG X, XU N W, WU W, et al. Instability of an intersecting fault-dyke system during deep rock excavation[J]. International Journal of Rock Mechanics and Mining Sciences, 2022, 153: 105087. [13] 周春华,李云安,尹健民, 等. 荒沟抽水蓄能电站地下厂房开挖过程微震及电磁辐射活动特征研究[J]. 岩石力学与工程学报,2019,38(增刊2):3583-3594. ZHOU Chunhua, LI Yun'an, YIN Jianmin, et al. Study on the characteristics of microseismicity and electromagnetic radiation activity of the underground powerhouse at Huanggou Pumped Storage Power Station subjected to the excavation[J]. Chinese Journal of Rock Mechanics and Engineering, 2019, 38(Suppl.2):3583-3594. [14] 周朝,尹健民,周春华,等. 考虑累积微震损伤效应的荒沟电站地下洞室群围岩稳定性分析[J].岩石力学与工程学报,2020,39(5):1011-1022. ZHOU Chao, YIN Jianmin, ZHOU Chunhua, et al. Stability analysis of surrounding rock mass of underground caverns at Huanggou Hydropower Station considering cumulative microseismic damage effect[J]. Chinese Journal of Rock Mechanics and Engineering, 2020, 39(5):1011-1022. [15] 孟国涛, 樊义林, 江亚丽, 等. 白鹤滩水电站巨型地下洞室群关键岩石力学问题与工程对策研究[J]. 岩石力学与工程学报, 2016, 35(12): 2549-2560. MENG Guotao, FAN Yilin, JIANG Yali, et al. Key rock mechanical problems and measures for huge caverns of Baihetan Hydropower Plant[J]. Chinese Journal of Rock Mechanics and Engineering, 2016, 35(12): 2549-2560. [16] 石崇, 褚卫江, 郑文棠. 块体离散元数值模拟技术及工程应用[M]. 北京: 中国建筑工业出版社, 2016. [17] LI A, XU N W, DAI F, et al. Stability analysis and failure mechanism of the steeply inclined bedded rock masses surrounding a large underground opening[J]. Tunnelling and Underground Space Technology, 2018, 77: 45-58. [18] 毛浩宇,徐奴文,李彪,等.基于离散元模拟和微震监测的白鹤滩水电站左岸地下厂房稳定性分析[J].岩土力学,2020, 41(7):2470-2484. MAO Haoyu, XU Nuwen, LI Biao, et al. Stability analysis of an underground powerhouse on the left bank of the Baihetan Hydropower Station based on discrete element simulation and microseismic monitoring[J]. Rock and Soil Mechanics, 2020, 41(7):2470-2484. [19] 张頔,李邵军,徐鼎平,等. 双江口水电站主厂房开挖初期围岩变形破裂与稳定性分析研究[J]. 岩石力学与工程学报,2021,40(3):520-532. ZHANG Di, LI Shaojun, XU Dingping, et al. Investigation on deformation and cracking behaviors and stability analysis of surrounding rock mass of underground main powerhouse of Shuangjiangkou Hydropower Station during preliminary excavation[J]. Chinese Journal of Rock Mechanics and Engineering, 2021, 40(3): 520-532. [20] 杨云浩,王仁坤,邢万波,等. 猴子岩水电站洞群硬脆性围岩变形破坏特征的3DEC分析[J]. 岩石力学与工程学报,2015,34(增刊2): 4178-4186. YANG Yunhao, WANG Renkun, XING Wanbo, et al. Analysis of deformation and failure of hard rock mass surrounding underground openings in Houziyan Hydropower Station by 3DEC numerical simulation[J]. Chinese Journal of Rock Mechanics and Engineering, 2015, 34(Suppl.2): 4178-4186. [21] SHI A C, LI C J, HONG W B, et al. Comparative analysis of deformation and failure mechanisms of underground powerhouses on the left and right banks of Baihetan Hydropower Station[J]. Journal of Rock Mechanics and Geotechnical Engineering, 2022, 14(3):731-745. [22] LEI Q H, LATHAM J P, TSANG C F. The use of discrete fracture networks for modelling coupled geomechanical and hydrological behaviour of fractured rocks[J]. Computers and Geotechnics, 2017, 85: 151-176. [23] DAMJANAC B, CUNDALL P. Application of distinct element methods to simulation of hydraulic fracturing in naturally fractured reservoirs[J]. Computers and Geotechnics, 2016, 71: 283-294. [24] 韩帅,李明超,王刚. 基于控制圆法和迭代反演的岩体多边形裂隙网络模拟方法[J]. 岩石力学与工程学报,2019,38(8):1635-1646. HAN Shuai, LI Mingchao, WANG Gang. A polygonal DFN modeling approach based on the circle-controlled method and the iterative inversion algorithm[J]. Chinese Journal of Rock Mechanics and Engineering, 2019, 38(8):1635-1646. [25] 蒋水华,陈佳栋,邹宗毅,等. 基于通用椭圆盘模型及3DEC实现的节理岩质边坡稳定性分析[J]. 岩石力学与工程学报,2023,42(7):1610-1622. JIANG Shuihua, CHEN Jiadong, ZOU Zongyi, et al. Stability analysis of jointed rock slopes based on a universal elliptical disc model and its realization in 3DEC[J]. Chinese Journal of Rock Mechanics and Engineering, 2023, 42(7):1610-1622. [26] WU N, LIANG Z Z, ZHANG Z H, et al. Development and verification of three-dimensional equivalent discrete fracture network modelling based on the finite element method[J]. Engineering Geology, 2022, 306: 106759. [27] 胡训健,卞康,刘建,等. 离散裂隙网络对岩石力学性质和声发射特性影响的颗粒流分析[J]. 岩土力学, 2022,43(增刊1):542-552. HU Xunjian, BIAN Kang, LIU Jian, et al. Particle flow code analysis of the effect of discrete fracture network on rock mechanical properties and acoustic emission characteristics[J]. Rock and Soil Mechanics, 2022, 43(Suppl.1):542-552. [28] 毛浩宇, 徐奴文, 孙悦鹏, 等. 基于微震能量分形维数的围岩变形预警[J]. 隧道与地下工程灾害防治, 2023, 5(4): 9-20. MAO Haoyu, XU Nuwen, SUN Yuepeng, et al. Deformation warning of surrounding rock based on fractal dimension of microseismic energy[J]. Hazard Control in Tunnelling and Underground Engineering, 2023, 5(4): 9-20. [29] XUE K S, ZHANG Z Y, ZHONG C L, et al. A fast numerical method and optimization of 3D discrete fracture network considering fracture aperture heterogeneity[J]. Advances in Water Resources, 2022, 162: 104164. [30] ZHANG F S, MACK M. Integrating fully coupled geomechanical modeling with microsesmicity for the analysis of refracturing treatment[J]. Journal of Natural Gas Science and Engineering, 2017, 46: 16-25. [31] WANG X H, ZHANG F S, TANG M R, et al. Numerical investigation of hydraulic fracture deflection in large-angle oblique horizontal wells with staged multi-cluster fracturing[J]. Geoenergy Science and Engineering, 2023, 222: 211436. [32] ZHANG F S, YIN Z R, CHEN Z W, et al. Fault reactivation and induced seismicity during multistage hydraulic fracturing: microseismic analysis and geomechanical modeling[J]. SPE Journal, 2020, 25(2): 692-711.
2024, Vol. 6 
