邹旭明,钟菊芳,陈竹,胡祎石

• 1:南昌航空大学土木建筑学院

摘要(Abstract)：

溪洛渡水库自2013年5月开始蓄水并正式投入使用后，库区周边地区的地震活动性发生了较大的变化，且大量地震集中出现在位于库区周边10 km以内的务基镇、黄琅镇一带。为了研究库水水位变化对库区周边地区地震活动性的影响，采用数值模拟方法，对库水荷载产生的附加弹性应力场以及库仑应力变化量进行了计算。结果表明：(1)库水荷载产生的弹性附加应力对峨边—金阳断裂以及莲峰断裂影响较大，其附加正应力和剪应力均达到kPa量级；(2)库伦应力增量达到0.01 MPa量级的区域集中在云山村—田坝村一带，而务基镇周边地区的库仑应力变化量并未达到这一量级。经过分析认为，单纯的库水荷载产生的弹性附加应力不足以使水库影响区内的地震活动性发生如此大的变化，务基镇一带的背景应力可能在蓄水前就已经达到了临界状态，库水荷载在该处只起到了触发作用。

关键词(KeyWords)： 水库地震;数值模拟;弹性响应;库仑应力变化量;地震成因

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51969019,51468045);; 南昌航空大学研究生创新专项资金项目(YC2021-S699)

作者(Author): 邹旭明,钟菊芳,陈竹,胡祎石

DOI: 10.13928/j.cnki.wrahe.2022.10.015

参考文献(References)：

• [1] CARDER D S.Seismic investigations in the Boulder Dam area,1940-1944,and the influence of reservoir loading on local earthquake activity[J].GeoScienceWorld,1945,35(4):203.
• [2] TALWANI P ,ACREE S .Pore pressure diffusion and the mechanism of reservoir-induced seismicity[J].Pure and Applied Geophysics,1985,122(6):947-965.
• [3] BELL M L ,NUR A.Strength changes due to reservoir-induced pore pressure and stresses and application to Lake Oroville[J].Journal of Geophysical Research:Solid Earth,1979,16(5):107.
• [4] KETTLETY T,VERDON J P.Fault Triggering Mechanisms for Hydraulic Fracturing-Induced Seismicity From the Preston New Road,UK Case Study[J].Frontiers in Earth Science,2021,9:670771.
• [5] LOMNITZ C.Earthquakes and reservoir impounding:State of the art[J].Engineering Geology,1974,8(1-2):191-198.
• [6] 周斌.水库诱发地震时空演化特征及其动态响应机制研究[D].北京：中国地震局地质研究所，2010.ZHOU Bin.Study on spatio-temporal evolution characteristics and dynamic response mechanism of reservoir-induced earthquakes[D].Beijing:Institute of Geology,China Earthquake Administration,2010.
• [7] 刘素梅，徐礼华.丹江口库区水压应力场的有限元模拟[J].水利学报，2005,36(7):863-869.LIU Sumei,XU Lihua.Finite element simulation of water pressure stress field in Danjiangkou Reservoir area[J].Journal of hydraulic engineering,2005,36(7):863-869.
• [8] 谢向东，刘素梅.考虑断裂破碎带的丹江口库区地应力场与水压应力场耦合反演及地震预测[J].西安建筑科技大学学报(自然科学版),2014,46(4):529-535.XIE Xiangdong,LIU Sumei.Coupling inversion of geostress field and hydraulic stress field and earthquake prediction in Danjiangkou reservoir area of fracture zone are considered in hydraulic Journal[J].Journal of Xi ′an University of Architecture and Technology (Natural Science),2014,46(4):529-535.
• [9] 陈蜀俊，姚运生，曾佐勋，等.三峡库首区蓄水前后构造应力场三维数值模拟研究[J].岩石力学与工程学报，2005,24(S2):5611-5618.CHEN Shujun,YAO Yunsheng,ZENG Zuoxun,et al.Three-dimensional numerical simulation of tectonic stress field before and after impoundment of the Three Gorges Reservoir [J].Chinese Journal of Rock Mechanics and Engineering,2005,24(S2):5611-5618.
• [10] 谢向东.基于流固耦合理论的丹江口水库诱发地震机理研究[D].武汉：武汉大学，2010.XIE Xiangdong.Study on mechanism of Danjiangkou reservoir induced earthquake based on fluid-structure interaction theory [D].Wuhan:Wuhan University,2010.
• [11] 杨彧，杨晓松，段庆宝.水库蓄水与断层带流体孔隙压时-空分布的数值模拟：以紫坪铺水库为例[J].地震地质，2015,37(2):510-523.YANG Yu,YANG Xiaosong,DUAN Qingbao.Numerical simulation of time-space distribution of reservoir impounding and fluid pore pressure in fault zone:A case study of Zipingpu Reservoir [J].Seismology and Geology,2015,37(2):510-523.
• [12] 虞金鑫，王秋良，赵艳南.基于流固耦合理论的三峡库首区蓄水后附加应力场研究[J].大地测量与地球动力学，2020,40(9):928-930.YU Jinxin,WANG Qiuliang,ZHAO Yannan.Study on additional stress field after impoundment of the Three Gorges Reservoir based on fluid-structure interaction theory [J].Journal of Geodesy and Geodynamics,2020,40(9):928-930.
• [13] 周斌，孙峰，阎春恒，等.龙滩水库诱发地震三维孔隙弹性有限元数值模拟[J].地球物理学报，2014,57(9):2846-2868.ZHOU Bin,SUN Feng,YAN Chunheng,et al.Numerical simulation of three-dimensional pore-elastic finite element method for Longtan reservoir induced earthquake [J].Chinese Journal of Geophysics,2014,57(9):2846-2868.
• [14] 程惠红，张怀，朱伯靖，等.新丰江水库地震孔隙弹性耦合有限元模拟[J].中国科学：地球科学，2012,42(6):905-916.CHENG Huihong,ZHANG Huai,ZHU Bojing,et al.Finite element simulation of seismic pore-elastic coupling in Xinfengjiang reservoir [J].Science China Earth Sciences,2012,42(6):905-916.
• [15] 苏珊，韩立波，郭祥云.溪洛渡水库近场区蓄水前后震源机制及应力场研究[J].地震研究，2020,43(2):402-411.SU Shan,HAN Libo,GUO Xiangyun.Study on focal mechanism and stress field before and after impoundment of Xiluodu Reservoir near field [J].Seismological Research,2020,43(2):402-411.
• [16] 覃礼貌.溪洛渡水电站坝区错动带构造特征及其工程意义[D].成都：成都理工大学，2003.QIN Limao.Structural characteristics and engineering significance of staggered zone in Dam area of Xiluodu Hydropower Station [D].Chengdu:Chengdu University of Technology,2003.
• [17] 罗建伟，李勇，叶建庆.溪洛渡水库影响区地震活动性分析[J].地震研究，2020,43(1):118-124.LUO Jianwei,LI Yong,YE Jianqing.Seismic activity analysis of Xiluodu Reservoir affected area [J].Seismological research,2020,43(1):118-124.
• [18] SIMPSON D W,LEITH W S,SCHOLZ C H.Two types of reservoir-induced seismicity[J].Bulletin of the Seismological Society of America,1988,78(6):2025-2040.
• [19] 《工程地质手册》编委会.工程地质手册(第5版)[M].北京：中国建筑工业出版社，2018.Editorial Board of Engineering Geology Handbook.Engineering Geology Handbook (5th Edition)[M].Beijing:China Architecture and Building Press,2018.
• [20] 杨磊.向家坝、溪洛渡水库区三维P波速度结构及地震精定位研究[D].北京：中国水利水电科学研究院，2020.YANG Lei.A study on three-dimensional P-wave velocity structure and precise seismic location in Xiangjiaba and Xiluodu reservoir areas [D].Beijing:China Institute of Water Resources and Hydropower Research,2020.
• [21] 徐礼华，谢向东，刘素梅.考虑断裂破碎带的丹江口水库诱发地震成因数值模拟分析[J].土木工程学报，2010,43(12):127-136.XU Lihua,XIE Xiangdong,LIU Sumei.A numerical simulation of the genesis of the danjiangkou reservoir-induced earthquake considering the fracture zone [J].China Civil Engineering Journal,2010,43(12):127-136.
• [22] 郝明辉，陈厚群，张艳红.ABAQUS中剪胀角的选取探讨[J].水利学报，2012,43(S1):91-97.HAO Minghui,CHEN Houqun,ZHANG Yanhong.Study on dilatancy Angle of ABAQUS [J].Journal of hydraulic engineering,2012,43(S1):91-97.
• [23] 孔位学，芮勇勤，董宝弟.岩土材料在非关联流动法则下剪胀角选取探讨[J].岩土力学，2009,30(11):3278-3282.KONG Weixue,RUI Yongqin,DONG Baodi.Dilatancy Angle of rock and soil materials under non-associated flow law [J].Chinese journal of rock and soil mechanics,2009,30(11):3278-3282.
• [24] 赵鹏.三峡水库运行过程中重庆境内水库诱发地震研究[D].重庆：重庆交通大学，2009.ZHAO Peng.A study on reservoir-induced earthquakes in Chongqing during the operation of the Three Gorges Reservoir [D].Chongqing:Chongqing Jiaotong University,2009.
• [25] STEIN R S,LISOWSKI M.The 1979 Homestead Valley Earthquake Sequence,California:Control of aftershocks and postseismic deformation[J].Journal of Geophysical Research:Solid Earth,1983,88(B8):6477.
• [26] 石耀霖，曹建玲.库仑应力计算及应用过程中若干问题的讨论：以汶川地震为例[J].地球物理学报，2010,53(1):102-110.SHI Yaolin,CAO Jianling.Discussion on the Calculation and application of Coulomb stress:A case study of Wenchuan Earthquake [J].Chinese Journal of Geophysics,2010,53(1):102-110.
• [27] KING G,STEIN R S,JIAN L.Static stress changes and the triggering of earthquakes[J].Bull.Seism.Soc.Am,1994,78(3).