Development characteristics and formation mechanism of the medium-dip bedding slopes：A case study of the landslide on the left bank of Tuodan reservoir dam
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摘要:
中等倾角岩层顺向坡，受坡体结构和岩体物理力学性质控制，多存在变形、崩塌、滑坡等工程地质问题，常常会诱发大规模的地质灾害。该类斜坡潜在滑动面不直接出露地表，一般具有变形机制复杂、隐蔽性强和危害大的特点，是滑坡领域关注与研究的重点。拖担水库大坝左岸为一古滑坡，在水库扩建开挖过程中，诱发古滑坡体复活。在分析古滑坡工程地质条件的基础上，结合地质勘察和变形监测结果，研究了其变形特征及形成机制。研究结果表明：①左岸古滑坡具有岩层倾角“上陡下缓”、滑体底部存在反倾坡内的剪切破碎带、滑床岩体产生弧状弯曲的特点；②古滑坡体为一基岩顺层滑坡，滑动模式为“滑移（弯曲）—剪断”型，其变形破坏过程包括三个阶段：弯曲隆起阶段、滑移剪出阶段和扰动变形阶段；③该类斜坡变形破坏后，坡体易沿“上陡下缓”的椅型软弱层面发生二次滑动，滑坡控制关键是对下部变形区的保护。
Abstract:Controlled by the slope structure and petrophysic properties, there are many engineering geological problems such as deformation, collapse in the medium-dip bedding slopes, and landslides, which often induce large-scale geological disasters. The potential sliding surface of this slope type does not directly expose on the surface, and it generally has the characteristics of complicated deformation mechanism, high concealment and great harm, which is the focus in the field of landslides research. The left bank of Tuodan reservoir dam is an ancient landslide. During the expansion and excavation of the reservoir, the ancient landslide was revived. Based on the analysis of the engineering geological conditions of the deformation body, combined with the results of geological survey and deformation monitoring, the deformation characteristics and formation mechanism are studied. The research results show that: ①The rock stratum dip has the characteristics of “steep upward and gentle downward” in ancient landslide of left bank. There is a shear fracture zone in the anti-inclined slope at the bottom of the landslide body, and the rock body of the slide bed is arch-bend.; ②The ancient landslide is a bedrock bedding landslide, and its sliding mode is “slip(bending)-shear” type. The deformation and failure process includes three stages, slipping shear-out stage and disturbance deformation stage; ③After the deformation and failure of the slope, it is more likely to slide again along the chair-shaped soft layer. The key to landslide control is to protect the lower deformation area.
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[1] 柴波, 殷坤龙. 顺向坡岩层倾向与坡向夹角对斜坡稳定性的影响[J]. 岩石力学与工程学报,2009,28(3):628 − 634. [CHAI Bo, YIN Kunlong. Influence of intersection angle between trend of slope and strata on stability of bedding slope[J]. Chinese Journal of Rock Mechanics and Engineering,2009,28(3):628 − 634. (in Chinese with English abstract) doi: 10.3321/j.issn:1000-6915.2009.03.024
[2] 周剑, 邓茂林, 李卓骏, 等. 三峡库区浮托减重型滑坡对库水升降的响应规律[J]. 水文地质工程地质,2019,46(5):136 − 143. [ZHOU Jian, DENG Maolin, LI Zhuojun, et al. Response patterns of buoyancy weight loss landslides under reservoir water level fluctuation in the Three Gorges Reservoir area[J]. Hydrogeology & Engineering Geology,2019,46(5):136 − 143. (in Chinese with English abstract)
[3] 黄润秋, 赵建军, 巨能攀, 等. 汤屯高速公路顺层岩质边坡变形机制分析及治理对策研究[J]. 岩石力学与工程学报,2007,26(2):239 − 246. [HUANG Runqiu, ZHAO Jianjun, JU Nengpan, et al. Study on deformation mechanism and control method of bedding rock slope along Tangtun expressway[J]. Chinese Journal of Rock Mechanics and Engineering,2007,26(2):239 − 246. (in Chinese with English abstract) doi: 10.3321/j.issn:1000-6915.2007.02.003
[4] 肖诗荣, 刘德富, 胡志宇. 世界三大典型水库型顺层岩质滑坡工程地质比较研究[J]. 工程地质学报,2010,18(1):52 − 59. [XIAO Shirong, LIU Defu, HU Zhiyu. Engineering geologic study of three actual dip bedding rockslides associated with reservoirs in the world[J]. Journal of Engineering Geology,2010,18(1):52 − 59. (in Chinese with English abstract) doi: 10.3969/j.issn.1004-9665.2010.01.007
[5] 黄润秋. 20世纪以来中国的大型滑坡及其发生机制[J]. 岩石力学与工程学报,2007,26(3):433 − 454. [HUANG Runqiu. Larg-Scale landslides and their sliding mechanisms in china since the 20th Century[J]. Chinese Journal of Rock Mechanics and Engineering,2007,26(3):433 − 454. (in Chinese with English abstract) doi: 10.3321/j.issn:1000-6915.2007.03.001
[6] 卫童瑶, 殷跃平,高杨,等. 三峡库区巫山县塔坪H1滑坡变形机制[J]. 水文地质工程地质,2020,47(12):73 − 81. [WEI Tongyao, YIN Yueping, GAO Yang,et al. Deformation mechanism of the taping H1 landslide in Wushan County in the Three Gorges Reservoir area[J]. Hydrogeology & Engineering Geology,2020,47(12):73 − 81. (in Chinese with English abstract) doi: 10.3969/j.issn.1000-7598.2011.12.028
[7] 瞿生军, 赵建军, 丁秀美, 等. 降雨诱发缓倾顺层滑坡机制离散元模拟[J]. 水文地质工程地质,2016,43(6):120 − 126. [QU Shengjun, ZHAO Jianjun, DING Xiumei, et al. Discrete element simulation of rainfall induced shelving bedding landslides[J]. Hydrogeology & Engineering Geology,2016,43(6):120 − 126. (in Chinese with English abstract)
[8] 张倬元, 王士天, 王兰生. 工程地质分析原理[M]. 北京: 地质出版社, 2009.
ZHANG Zhuoyuan, WANG Shitian, WANG Lansheng. Principle of engineering geology analysis[M]. Beijing: Geological Publishing House, 2009. (in Chinses)
[9] 任光明, 李树森, 聂德新, 等. 顺层坡滑坡形成机制的物理模拟及力学分析[J]. 山地研究,1998,16(3):182 − 187. [REN Guangming, LI Shusen, NIE Dexin, et al. The physical simulation and mechanical analysis on landslide's formation mechanism on consequent slope[J]. Journal of Mountain Research,1998,16(3):182 − 187. (in Chinese with English abstract)
[10] 陈全明, 方琼, 罗冠枝, 等. 缓倾顺层岩质斜坡破坏条件和变形机制分析-以常吉高速公路朱雀洞滑坡为例[J]. 中国地质灾害与防治学报,2020,31(2):18 − 23. [CHEN Quanming, FANG Qiong, LUO Guanzhi, et al. Failure conditions and mechanism of the gentle dip bedding slopes: a case study of the Zhuquedong Landslide[J]. The Chinese Journal of Geological Hazard and Control,2020,31(2):18 − 23. (in Chinese with English abstract)
[11] 朱晗迓, 马美玲, 尚岳全. 顺倾向层状岩质边坡溃屈破坏分析[J]. 浙江大学学报(工学版),2004,38(9):1144 − 1149. [ZHU Hanya, MA Meiling, SHANG Yuequan. Analysis of buckling failure of consequent rock slope[J]. Journal of Zhejiang University(Engineering Science),2004,38(9):1144 − 1149. (in Chinese with English abstract)
[12] 李云鹏, 杨治林, 王芝银. 顺层边坡岩体结构稳定性位移理论[J]. 岩石力学与工程学报,2000,19(6):747 − 750. [LI Yunpeng, YANG Zhilin, WANG Zhiyin. Displacement theory of structure stability for rock mass bedding slope[J]. Chinese Journal of Rock Mechanics and Engineering,2000,19(6):747 − 750. (in Chinese with English abstract) doi: 10.3321/j.issn:1000-6915.2000.06.013
[13] 余姝, 张枝华, 黄波林, 等. 三峡库区青石-抱龙段顺层灰岩库岸坡变形破坏机理[J]. 中国地质灾害与防治学报,2019,30(3):18 − 23. [YU Shu, ZHANG Zhihua, HUANG Bolin, et al. Deformation mechanism of bedding limestone bank slope from Qingshi to Baolong, the Three Gorges Area[J]. The Chinese Journal of Geological Hazard and Control,2019,30(3):18 − 23. (in Chinese with English abstract)
[14] 王运生, 唐兴君, 石豫川, 等. 西南某水电站中倾顺层滑坡稳定性分析[J]. 南水北调与水利科技,2006,4(5):23 − 25. [WANG Yunsheng, TANG Xingjun, SHI Yuchuan, et al. Analysis on the Medium-Dip bedding slide stability in a hydropower station of the southwest of China[J]. South to North Water Transfers and Water Science&Technology,2006,4(5):23 − 25. (in Chinese with English abstract) doi: 10.3969/j.issn.1672-1683.2006.05.008
[15] 高杨, 贺凯, 李壮, 等. 西南岩溶山区特大滑坡成灾类型及动力学分析[J]. 水文地质工程地质,2020,47(4):14 − 23. [GAO Yang, HE Kai, LI Zhuang, et al. An analysis of disaster types and dynamics of landslides in the southwest karst mountain areas[J]. Hydrogeology & Engineering Geology,2020,47(4):14 − 23. (in Chinese with English abstract)
[16] 郭延辉, 杨溢, 杨志全, 等. 国产GB-InSAR在特大型水库滑坡变形监测中的应用[J]. 中国地质灾害与防治学报,2021,32(2):66 − 72. [GUO Yanhui, YANG Yi, YANG Zhiquan, et al. Application of GB-InSAR in deformation monitoring of huge landslide in reservoir area[J]. The Chinese Journal of Geological Hazard and Control,2021,32(2):66 − 72. (in Chinese with English abstract)
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