Deformation mechanism and reinforcement treatment of right abutment high slope of Yebatan Hydropower Station

ZHANG Chong; LIU Xiaoqiang; HU Xuan; ZHANG Jing; PAN Yanfang; WEI Wei; JIANG Qinghui

doi:10.11779/CJGE20231188

Volume 47 Issue 3

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Chinese Journal of Geotechnical Engineering > 2025 > 47(3): 477-486. > DOI: 10.11779/CJGE20231188

ZHANG Chong, LIU Xiaoqiang, HU Xuan, ZHANG Jing, PAN Yanfang, WEI Wei, JIANG Qinghui. Deformation mechanism and reinforcement treatment of right abutment high slope of Yebatan Hydropower Station[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(3): 477-486. DOI: 10.11779/CJGE20231188

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Deformation mechanism and reinforcement treatment of right abutment high slope of Yebatan Hydropower Station

1.
Chengdu Engineering Corporation Limited POWERCHINA, Chengdu 610072, China
2.
School of Civil Engineering, Wuhan University, Wuhan 430072, China

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Received Date: December 03, 2023
Available Online: October 17, 2024

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Abstract

Abstract

Yebatan Hydropower Station is located in the complex geological zone at the edge of the Tibetan Plateau in the upper reaches of the Jinsha River. The slope in the junction area has large excavation height, strong unloading and complex geological conditions. After the excavation of the right abutment slope, more than 300 cracks appear in the slope surface and adits along f29, fr18, f85 and other faults. The deformation and cracking mechanism of the slope, the current stability of the slope after cracking and whether to take emergency reinforcement are the key technical problems that need to be answered at the construction stage of Yebatan Hydropower Station. In this study, the boundary conditions and failure modes of the right abutment slope are investigated by integrating a comprehensive method with the engineering geological condition analysis, monitoring data analysis, three-dimensional limit equilibrium analysis and numerical simulation. Under the influences of the combined factors of slope excavation and unloading, lagging support and seepage softening of construction water, the stability of the wedge-shaped blocks formed by the faults f29 and f85 decreases, resulting in the creeping deformation directed to the riverbed. The upstream and downstream boundaries controlling the overall stability of the slope are the faults f85 and f29, and the failure mode is wedge sliding. According to the normal and shear stress distribution on the sliding surfaces of the wedge block, the emergency reinforcement measures of anti-shear tunnels arranged along the faults of f29 and f85 are proposed, supplemented by engineering measures of anchor cables and drainage. The stability analysis results indicate that the emergency reinforcement measures can significantly increase the stability of the block, and the reinforced slope can meet the stability requirements. The research findings can be used as reference for the mechanism analysis and emergency reinforcement treatment of high rock slopes with similar deformation and cracking failure.
- Yebatan Hydropower Station,
- abutment slope,
- cracking deformation,
- numerical simulation,
- stability analysis,
- reinforcement treatment

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[1]	黄润秋. 中国西南岩石高边坡的主要特征及其演化[J]. 地球科学进展, 2005, 20(3): 292-297. doi: 10.3321/j.issn:1001-8166.2005.03.005 HUANG Runqiu. Main characteristics of hign rock slopes in southWestern China and their dynamic evolution[J]. Advances in Earth Science, 2005, 20(3): 292-297. (in Chinese) doi: 10.3321/j.issn:1001-8166.2005.03.005
[2]	宋胜武, 冯学敏, 向柏宇, 等. 西南水电高陡岩石边坡工程关键技术研究[J]. 岩石力学与工程学报, 2011, 30(1): 1-22. SONG Shengwu, FENG Xuemin, XIANG Baiyu, et al. Research on key technologies for high and steep rock slopes of hydropower engineering in Southwest China[J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(1): 1-22. (in Chinese)
[3]	马洪琪. 小湾水电站建设中的几个技术难题[J]. 水利发电, 2009, 35(9): 17-21. MA Hongqi. Technical difficulties in the construction of Xiaowan hydropower station[J]. Water Power, 2009, 35(9): 17-21. (in Chinese)
[4]	徐奴文, 李韬, 戴峰, 等. 基于离散元模拟和微震监测的白鹤滩水电站左岸岩质边坡稳定性分析[J]. 岩土力学, 2017, 38(8): 2358-2367. XU Nuwen, LI Tao, DAI Feng, et al. Stability analysis on the left bank slope of Baihetan hydropower station based on discrete element simulation and microseismic monitoring[J]. Rock and Soil Mechanics, 2017, 38(8): 2358-2367. (in Chinese)
[5]	李韬, 徐奴文, 戴峰, 等. 白鹤滩水电站左岸坝肩开挖边坡稳定性分析[J]. 岩土力学, 2018, 39(2): 665-674. LI Tao, XU Nuwen, DAI Feng, et al. Stability analysis of left bank abutment slope at Baihetan hydropower station subjected to excavation[J]. Rock and Soil Mechanics, 2018, 39(2): 665-674. (in Chinese)
[6]	陈佳伟, 邓建辉, 魏进兵, 等. 长河坝水电站右坝肩边坡裂缝成因分析[J]. 岩石力学与工程学报, 2012, 31(6): 1121-1127. doi: 10.3969/j.issn.1000-6915.2012.06.005 CHEN Jiawei, DENG Jianhui, WEI Jinbing, et al. Cause analysis of cracking in right abutment slope of changheba hydropower station[J]. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(6): 1121-1127. (in Chinese) doi: 10.3969/j.issn.1000-6915.2012.06.005
[7]	彭巨为. 长河坝水电站坝肩边坡动态监测及稳定性分析[J]. 地下空间与工程学报, 2017, 13(增刊2): 915-920. PENG Juwei. Dynamic monitoring and stability analysis on abutment slope of Changheba hydropower station[J]. Chinese Journal of Underground Space and Engineering, 2017, 13(S2): 915-920. (in Chinese)
[8]	向柏宇, 姜清辉, 宋胜武, 等. 深埋混凝土抗剪结构加固设计方法及其在大型边坡工程治理中的应用[J]. 岩石力学与工程学报, 2012, 31(2): 289-302. doi: 10.3969/j.issn.1000-6915.2012.02.008 XIANG Baiyu, JIANG Qinghui, SONG Shengwu, et al. Reinforcement design method for deep embedded concrete shear resistance structure and its application to large-scale engineering slope[J]. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(2): 289-302. (in Chinese) doi: 10.3969/j.issn.1000-6915.2012.02.008
[9]	商开卫, 张公平. 大岗山水电站右岸坝肩边坡深层加固研究[J]. 人民黄河, 2018, 40(1): 138-144. doi: 10.3969/j.issn.1000-1379.2018.01.033 SHANG Kaiwei, ZHANG Gongping. Deep reinforcement study on right dam shoulder slope of dagangshan hydropower station[J]. Yellow River, 2018, 40(1): 138-144. (in Chinese) doi: 10.3969/j.issn.1000-1379.2018.01.033
[10]	MA K, LIU G Y, GUO L J, et al. Deformation and stability of a discontinuity-controlled rock slope at Dagangshan hydropower station using three-dimensional discontinuous deformation analysis[J]. International Journal of Rock Mechanics and Mining Sciences, 2020, 130: 104313. doi: 10.1016/j.ijrmms.2020.104313
[11]	中国水电顾问集团成都勘测设计研究院. 金沙江叶巴滩水电站大坝工程标招标设计报告—4. 工程地质[R]. 成都: 中国水电顾问集团成都勘测设计研究院, 2017. Chengdu Hydropower Investigation and Design Institute, China Hydropower Consulting Group. Dam project tender design report of Yebatan hydropower project, Jinsha River, part 4: engineering geology[R]. Chengdu: Chengdu Hydropower Investigation and Design Institute, China Hydropower Consulting Group, 2017. (in Chinese)).
[12]	姜清辉, 王笑海, 丰定祥, 等. 三维边坡稳定性极限平衡分析系统软件SLOPE3D的设计及应用[J]. 岩石力学与工程学报, 2003, 22(7): 1121-1125. doi: 10.3321/j.issn:1000-6915.2003.07.014 JIANG Qinghui, WANG Xiaohai, FENG Dingxiang, et al. SLOPE3D—a three-dimensional limit equilibrium analysis software for slope stability and its application[J]. Chinese Journal of Rock Mechanics and Engineering, 2003, 22(7): 1121-1125. (in Chinese) doi: 10.3321/j.issn:1000-6915.2003.07.014
[13]	JIANG Q H, LIU X H, WEI W, et al. A new method for analyzing the stability of rock wedges[J]. International Journal of Rock Mechanics and Mining Sciences, 2013, 60: 413-422. doi: 10.1016/j.ijrmms.2013.01.008
[14]	JIANG Q H, ZHOU C B. A rigorous solution for the stability of polyhedral rock blocks[J]. Computers and Geotechnics, 2017, 90: 190-201. doi: 10.1016/j.compgeo.2017.06.012
[15]	水电工程边坡设计规范: NB/T 10512—2021[S]. 北京: 中国水利水电出版社, 2021. Code for Slope Design of Hydropower Projects: NB/T 10512—2021[S]. Beijing: China Water & Power Press, 2021. (in Chinese)

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