Seismic fragility analysis for earth-rockfill dams based on deformation
WANG Du-bo1, 2, LIU Han-long1, YU Tao1, YANG Gui1
1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. North China University of Water Resources and Electric Power, School of Management and Economics, Zhengzhou 450045, China
Abstract：Seismic fragility is an important part of seismic risk analysis, which can be adopted to predict the probabilities of structural damage induced by different levels of earthquakes. The fragility analysis provides an effective way for the seismic risk analysis and evaluation of earth-rockfill dams due to the dam performance with different degrees of damage under earthquakes. Considering the uncertainties of earth-rockfill dam material parameters and ground motion effect, a seismic fragility analysis method for earth-rockfill dams is proposed. Seismic response analysis is undertaken by using different peak accelerations of earthquakes. The combinations of material parameter samples are obtained by means of the method of orthogonal design. A fragility curve of the dam is proposed based on the relative settlement of the dam crest which serves as a seismic damage evaluation index. The seismic fragility analysis is applied in the Yunpeng Core Earth-rockfill Dam, and the risk probabilities with different seismic damages are obtained. This research is of great significance and applicable value for seismic risk assessment, seismic design, reinforcement and maintenance measures of earth-rockfill dams.
王笃波, 刘汉龙, 于陶, 杨贵. 基于变形的土石坝地震易损性分析[J]. 岩土工程学报, 2013, 35(5): 814-819.
WANG Du-bo, LIU Han-long, YU Tao, YANG Gui. Seismic fragility analysis for earth-rockfill dams based on deformation. Chinese J. Geot. Eng., 2013, 35(5): 814-819.
[1] KENNEDY R P. Seismic fragilities for nuclear power plant risk studies[J]. Nuclear Engineering and Design, 1980,59(2):315-338. [2] KENNEDY R P, RAVINDRA M K. Seismic fragilities for nuclear power plant risk studies[J]. Nuclear Engineering and Design, 1984,79(1):47-68. [3] TEKIE P B, ELLINGOOD B R. Seismic fragility assessment of concrete gravity dams[J]. Earthquake Engineering and Structura1 Dynamics, 2003,32(14):221-224. [4] PAPADRAKAKIS Manolis, PAPADOPOULOS Vissarion. Vulnerability analysis of large conerete dams using the continuum strong discontinuity approach and neura1 networks[J]. Structura1 Safety, 2008,30(3):217-235. [5] 沈怀至),金 峰,(张楚汉). 基于性能的重力坝-地基系统地震易损性分析[J]. (工程力学), 2008,25(12):86-91. (SHEN Huai-zhi, JIN Feng, ZHANG Chu-han. Performance-based seismic fragility analysis of concrete gravity-foudation system[J]. Engineering Mechanics, 2008, 25(12): 86-91.( (in Chinese)) [6] 常宝琦),(梁纪彬). 土坝的地震易损性和震害速评[J]. (华南地震), 1994,14(3):46-56. (CHANG Bao-qi, LIANG Ji-bin. Vulnerbility and evaluation of seismic damage for earth dams[J]. South China Journal of Seismology, 1994, 14(3): 46-56.( (in Chinese)) [7] KARIM K R, YAMAZAKI Fumio. Effect of earthquake ground motions on fragility curves of highway bridge piers based on numerical simulation[J]. Earthquake Engineering and Structural Dynamics, 2001,30(12):1839-1856. [8] 张继周),(缪林昌). 岩土参数概率分布类型及其选择标准[J]. (岩石力学与工程学报), 2009,28(增刊2):3526-3532. (ZHANG Ji-zhou, MIAO Lin-chang. Types and selection criteria of probability distribution of rock and soil parameters[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(S2): 3526-3532.( (in Chinese)) [9] 陈立宏),(陈祖煜),(刘金梅). 土体抗剪强度指标的概率分布类型研究[J]. (岩土力学), 2005,26(1):37-40, 45. (CHEN Li-hong, CHEN Zu-yu, LIU Jin-mei. Probability distribution of soil strength[J]. Rock and Soil Mechanics,2005,26(1): 37-40, 45. (in Chinese) [10] GB/T 2433600097;2009 生命线工程地震破坏等级划分[S] 北京: 中国标准出版社,2009. (GB/T 2433600097;2009. Classification of earthquake damage to lifeline engineering[S]Beijing: Standards Press of China. (in Chinese)) [11] 李红军),(迟世春),林 皋,等. 高土石坝地震永久变形研究评述[J]. (水利学报), 2007(增刊):178-183. (LI Hong-jun, CHI Shi-chun, LIN Gao. et al. Review on the seismically permanent deformation of high earth rock-fill dams[J]. Journal of Hydraulic Engineering, 2007(S0): 178-183. (in Chinese) [12] SWAISGOOD J R. Embankment dam deformations caused by earthquakes[C]// 2003 Pacific Conference on Earthquake Engineering[CD-ROM]. Christchurch, 2003. [13] 王笃波),(刘汉龙),于 陶. 基于变形的土石坝地震风险分析[J]. (岩土力学), 2012,33(5):1479-1484. (WANG Du-bo, LIU Han-long, YU Tao. Seismic risk analysis for earth-rockfill dam based on deformation[J]. Rock and Soil Mechanics,2012,33(5): 1479-1484. (in Chinese) [14] 陈 魁 试验设计与分析[M].北京:清华大学出版社,2005. (CHEN Kui. Experimental design and analyses[M]. Beijing: Tsinghua University Press, 2005. (in Chinese) [15] 刘汉龙),(丁选明),杨 贵,等. 云鹏水电站心墙土石坝有限元动力分析报告[R]. 南京: 河海大学, 2010.((LIU Han-long, DING Xuan-ming, YANG Gui, et al. The 3D finite element stress and strain research report of the Yunpeng hydropower station rockfill dam[R]. Nanjing [16] 刘汉龙),(陆兆溱),(钱家欢). 土石坝地震永久变形分析[J]. (河海大学学报), 1996,24(1):91-96. (LIU Han-long, LU Zhao-zhen, QIAN Jia-huan, Earthquake-induced permanent deformation of earth-rock dams[J]. Journal of Hohai University,1996,24(1): 91-96. (in Chinese)
