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| THREE-DIMENSIONAL STABILITY ANALYSIS OF DAM ABUTMENT OF WUDONGDE ARCH DAM |
| SHEN Hui1，LUO Xianqi1，LI Ye1，WENG Yonghong2 |
(1. School of Naval Architecture，Ocean and Civil Engineering，Shanghai Jiaotong University，Shanghai 200240，China；
2. Changjiang Institute of Survey，Planning，Design and Research，Changjiang Water
Resources Commission，Wuhan，Hubei 430010，China) |
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Abstract The fast Lagrangian analysis of continua in three dimensions(FLAC3D) was adopted based on nonlinear finite element analysis，to develop three-dimensional elastoplastic numerical simulation of Wudongde arch dam. Nine possible sliding blocks were determined through the altitude of discrete fracture inside the arch dam rock mass. The calculation method of the experiment was to apply the finite element stress value to the sliding face through interpolation，discount sliding face shearing strength based on the altitude of discrete fracture inside the sliding face，and compute the factor of safety through 3D vector sum method. The results indicate that the stress and displacement distributions are basically symmetrical to the river valley. However，affected by the faults F15，f42 and the K25 karst system，there is a slightly larger area affected in right abutment than that in left abutment. The results also show that the nine sliding blocks have high margin of safety under normal impounding level；temperature rise load causes the stability reduction of a majority of wedge blocks，while temperature drop load mainly affects the stability of right abutment negatively. Under the seismic load，the stabilities of all the wedge blocks reduce largely with an average reduction of 30% and the maximum reduction of 53.9%. However，the global abutments rock mass can still remain stable under such situation.
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Received: 21 December 2011
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| [1] 中华人民共和国行业标准编写组. DL/T5346—2006 混凝土拱坝设计规范[S]. 北京：中国电力出版社，2006.(The Professional Standards Compilation Group of People?s Republic of China. DL/T5346—2006 Design specification for concrete arch dams[S]. Beijing：China Electric Power Press，2006.(in Chinese))
[2] 中华人民共和国行业标准编写组. SL282—2003 混凝土拱坝设计规范[S]. 北京：中国水利水电出版社，2003.(The Professional Standards Compilation Group of People?s Republic of China. SL282—2003 Design specification for concrete arch dams[S]. Beijing：China Water Power Press，2003.(in Chinese))
[3] 周维垣，林 鹏，杨 强，等. 锦屏高边坡稳定三维地质力学模型试验研究[J]. 岩石力学与工程学报，2008，27(5)：894–901.(ZHOU Weiyuan，LIN Peng，YANG Qiang，et al. Experimental research on stability of Jinping high slope with three-dimensional geomechanical model[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(5)：894–901.(in Chinese))
[4] 董建华，谢和平，张 林，等. 大岗山双曲拱坝整体稳定三维地质力学模型试验研究[J]. 岩石力学与工程学报，2007，26(10)：2 027–2 036.(DONG Jianhua，XIE Heping，ZHANG Lin，et al. Experimental study of 3D geomechanical model on global stability of Dagangshan double curvature arch dam[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(10)：2 027–2 036.(in Chinese))
[5] 徐千军，李 旭，陈祖煜. 百色水利枢纽主坝坝基三维抗滑稳定分析[J]. 岩石力学与工程学报，2006，25(3)：533–538.(XU Qianjun，LI Xu，CHEN Zuyu. Three-dimensional stability analysis of dam foundation of Baise hydro-junction[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(3)：533–538.(in Chinese))
[6] 宋胜武，向柏宇，杨静熙，等. 锦屏一级水电站复杂地质条件下坝肩高陡边坡稳定性分析及其加固设计[J]. 岩石力学与工程学报，2010，29(3)：442–458.(SONG Shengwu，XIANG Baiyu，YANG Jingxi，et al. Stability analysis and reinforcement design of high and steep slopes with complex geology in abutment of Jingping I hydropower station[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(3)：442–458.(in Chinese))
[7] 宁 宇，徐卫亚，郑文棠. 白鹤滩水电站拱坝及坝肩加固效果分析及整体安全度评价[J]. 岩石力学与工程学报，2008，27(9)：1 890–1 898.(NING Yu，XU Weiya，ZHENG Wentang. Reinforcement effect analysis and global safety evaluation of arch dam and abutment of Baihetan hydropower station[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(9)：1 890–1 898.(in Chinese))
[8] 杨 强，朱 铃，翟明杰. 基于三维非线性有限元的坝肩稳定刚体极限平衡法机制研究[J]. 岩石力学与工程学报，2005，24(19)：3 403–3 409.(YANG Qiang，ZHU Ling，ZHAI Mingjie. On mechanism of rigid-body limit equilibrium method for abutment stability analysis of arch dam[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(19)：3 403–3 409.(in Chinese))
[9] 葛修润. 抗滑稳定分析新方法——矢量和分析法的基本原理及其应用[C]// 第十一次全国岩石力学与工程学术大会论文集. 武汉：湖北科学技术出版社，2010：26–44.(GE Xiurun. A new method for anti-sliding stability analysis—basic principle of vector sum analysis method and its application[C]// Proceedings of the 11th National Rock Mechanics and Engineering Conference. Wuhan：Hubei Science and Technology Press，2010：26–44.(in Chinese))
[10] 郭明伟，葛修润，李春光，等. 边坡和坝基抗滑稳定分析的三维矢量和法及其工程应用[J]. 岩石力学与工程学报，2010，29(1)：8–20.(GUO Mingwei，GE Xiurun，LI Chunguang，et al. Three-dimensional vector sum method employed in slope and dam foundation stability analyses and its applications to practical engineering[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(1)：8–20.(in Chinese))
[11] Itasca Consulting Group Inc.. FLAC3D user?s manual[R]. Minneapolis，USA：Itasca Consulting Group Inc.，2005.
[12] 张传庆，周 辉，冯夏庭，等. 局域地应力场获取的插值平衡方法[J]. 岩土力学，2008，29(8)：2 016–2 024.(ZHANG Chuanqing，ZHOU Hui，FENG Xiating，et al. Method for obtaining local stress field based on interpolation and numerical simulation method[J]. Rock and Soil Mechanics，2008，29(8)：2 016– 2 024.(in Chinese))
[13] 张振华. 深切河谷岸坡开挖过程动态预警方法研究[博士学位论文][D]. 武汉：中国科学院武汉岩土力学研究所，2008. (ZHANG Zhenhua. Study on dynamic warning method of bank slopes in deep-cut valley during the course of excavation[Ph. D. Thesis][D]. Wuhan：Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，2008.(in Chinese))
[14] 艾 凯，韩晓玉，李永松. 金沙江乌东德水电站地应力场回归分析[J]. 地下空间与工程学报，2006，2(6)：930–933.(AI Kai，HAN Xiaoyu，LI Yongsong. Regression analysis of in-situ stress for Wudongde hydropower station，Jinsha River[J]．Chinese Journal of Underground Space and Engineering，2006，2(6)：930–933.(in Chinese))
[15] 罗先启，袁 恒. 求解边坡矢量和安全系数的三维条分法[J]. 岩石力学与工程学报，2011，30(增1)：2 865–2 870.(LUO Xianqi，YUAN Heng. Solution of vector sum factor of safety of slope by three-dimensional method of columns[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(Supp.1)：2 865–2 870.(in Chinese))
[16] 刘艳章. 边坡与坝基抗滑稳定的矢量和分析法研究[博士学位论文][D]. 武汉： 中国科学院武汉岩土力学研究所，2007.(LIU Yanzhang. Vector sum analysis method of slope and dam foundation stability against sliding[Ph. D. Thesis][D]. Wuhan：Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，2007.(in Chinese))
[17] 郭明伟，李春光，葛修润，等. 基于矢量和分析方法的边坡滑面搜索[J]. 岩土力学，2009，30(6)：1 775–1 781.(GUO Mingwei，LI Chunguang，GE Xiurun，et al. Searching potential slip surface of slopes based on the vector sum analysis method[J]. Rock and Soil Mechanics，2009，30(6)：1 775–1 781.(in Chinese)) |
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2012, Vol. 31 
