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| SAFETY PERFORMANCE ANALYSIS OF ROCK WEDGES UNDER LEFT SKEWBACK OF UPSTREAM DAM LINE IN BAIHETAN HYDROPOWER STATION |
| (1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering，Hohai University，Nanjing，Jiangsu 210098，China；2. Geotechnical Research Institute，Hohai University，Nanjing，Jiangsu 210098，China；3. Guangdong Electric Power Design Institute，Guangzhou，Guangdong 510663，China；4. HydroChina Huadong Engineering Corporation，Hangzhou，Zhejiang 310014，China) |
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Abstract The rock wedges under left skewback of the upstream dam line are cut by many steep faults in the dam site of Baihetan Hydropower Station. They locate at the bottom and the downstream of the arch dam. Their stable movement or not will affect the safety of dam foundation and arch dam. The safety performance of arch dam and rock wedges are comprehensively analyzed considering the complicated crack hydraulic pressure in joint planes between rock wedges，various of water pressures are programmed and the approach is validated using the conceptual model in the software fast Lagrangian analysis of continua in 3 dimensions(FLAC3D). According to the results of calculation and the displacement of the selected typical nodes，the stability safety degree，surface safety factor and yield expansion of rock wedges are studied. Research shows that safety degree in sliding surface LS331 is lower than that in contact surface between the dam and the foundation，upstream dam heel of right bank begins to appear local yield when the overload safety coefficient is 1.5 with a consideration of many effects；the rock wedges cannot work normally when the overload safety coefficient is 3.1；the dam foundation can?t work normally when the overload safety coefficient is 3.3；and the rock masses under dam foundation is overall destroyed when the overload safety coefficient is 5.5.
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Received: 05 November 2010
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| [1] 石安池，唐鸣发，周其健. 金沙江白鹤滩水电站柱状节理玄武岩岩体变形特性研究[J]. 岩石力学与工程学报，2008，27(10)：2 079– 2 086.(SHI Anchi，TANG Mingfa，ZHOU Qijian. Research of deformation characteristics of columnar jointed basalt at Baihetan hydropower station on Jinsha River[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(10)：2 079–2 086.(in Chinese))
[2] 徐卫亚，郑文棠，宁 宇. 柱状节理坝基岩体三维各向异性数值分析[J]. 岩土力学，2010，31(3)：949–955.(XU Weiya，ZHENG Wentang，NING Yu. 3D anisotropic numerical analysis of rock mass with columnar joints for dam foundation[J]. Rock and Soil Mechanics，2010，31(3)：949–955. (in Chinese))
[3] 郑文棠. 不规则柱状节理岩石力学及在高边坡坝基岩石工程中的应用[博士学位论文][D]. 南京：河海大学，2008.(ZHENG Wentang. Rock mechanics of irregular columnar jointed basaltic mass and its application in high slope and dam foundation[Ph. D. Thesis][D]. Nanjing：Hohai University，2008.(in Chinese))
[4] 宁 宇. 柱状节理岩体各向异性等效强度与屈服准则研究[博士学位论文][D]. 南京：河海大学，2008.(NING Yu. Study on equivalent anisotropic strength and yield criterion of columnar jointed rock mass[Ph. D. Thesis][D]. Nanjing：Hohai University，2008.(in Chinese))
[5] 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))
[6] 舒继森，王兴中，周毅勇. 岩石边坡中滑动面水压分布假设的改进[J]. 中国矿业大学学报，2004，33(5)：509–512.(SHU Jisen，WANG Xingzhong，ZHOU Yiyong. Improving on assumption for water pressure distributing on failure surface in rock slope[J]. Journal of China University of Mining and Technology，2004，33(5)：509–512.(in Chinese))
[7] MAITY D，BHATTACHARYYA S K. Influence of upstream profile of dam and reservoir bed on the development of hydrodynamic pressure[J]. Journal of the Institution of Engineers(India)：Civil Engineering Division，2002，82(2)：197–200.
[8] BARPI F，VALENTE S. Modeling water penetration at dam- foundation joint[J]. Engineering Fracture Mechanics，2008，75(3/4)：629–642.
[9] 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))
[10] 中华人民共和国行业标准编写组. SL/282—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. SL/282—2003 Design specification for concrete arch dams[S]. Beijing：China Water Power Press，2003.(in Chinese))
[11] MASANNAT Y M. Geotechnical considerations in the treatment of the foundations of the left abutment of King Talal Dam[J]. Canadian Geotechnical Journal，1980，17(1)：34–43.
[12] KOTTENSTETTE J T. Block theory techniques used in arch dam foundations stability analysis[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1997，34(3)：573–578.
[13] SHEN X P，CHEN L X. Investigation on mixed-mode cohesive crack in the presence of water pressure for interface between dam and its foundation[J]. Advances in Structural Engineering，2002，5(1)：45–52.
[14] Itasca Consulting Group Inc.. FLAC3D(fast Lagrangian analysis of continua in 3 dimensions) user?s manual(version 3.0)[R]. Minneapolis，USA：Itasca Consulting Group Inc.，2005. |
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2011, Vol. 30 
