杨忠平, 李绪勇, 赵茜, 等. 2021. 关键影响因子作用下三峡库区堆积层滑坡分布规律及变形破坏响应特征[J]. 工程地质学报, 29(3): 617-627. doi: 10.13544/j.cnki.jeg.2021-0181.
    引用本文: 杨忠平, 李绪勇, 赵茜, 等. 2021. 关键影响因子作用下三峡库区堆积层滑坡分布规律及变形破坏响应特征[J]. 工程地质学报, 29(3): 617-627. doi: 10.13544/j.cnki.jeg.2021-0181.
    Yang Zhongping, Li Xuyong, Zhao Qian, et al. 2021. Key influencing factors based distribution regularity and deformation and failure response of colluvial landslides in Three Gorges Reservoir area[J]. Journal of Engineering Geology, 29(3): 617-627.doi: 10.13544/j.cnki.jeg.2021-0181.
    Citation: Yang Zhongping, Li Xuyong, Zhao Qian, et al. 2021. Key influencing factors based distribution regularity and deformation and failure response of colluvial landslides in Three Gorges Reservoir area[J]. Journal of Engineering Geology, 29(3): 617-627.doi: 10.13544/j.cnki.jeg.2021-0181.

    关键影响因子作用下三峡库区堆积层滑坡分布规律及变形破坏响应特征

    KEY INFLUENCING FACTORS BASED DISTRIBUTION REGULARITY AND DEFORMATION AND FAILURE RESPONSE OF COLLUVIAL LANDSLIDES IN THREE GORGES RESERVOIR AREA

    • 摘要: 三峡库区崩滑地质灾害频发,堆积层滑坡是最常见的滑坡类型。在分析三峡库区145处库岸堆积层滑坡资料基础上,选取地形地貌、地质岩性和斜坡构造作为控制因素、降水和库水波动作为主要诱发因素,探究堆积层滑坡在上述关键影响因子下的分布发育规律及变形破坏响应特征,阐明内在机理,结果表明:(1)受区域地质构造和基岩地层岩性显著控制,滑坡发育频次和规模沿长江存在显著空间差异性;(2)砂页岩夹煤层岩组(SC)和泥灰岩与砂泥岩互层岩组(MSM)对库区堆积层滑坡危害最大,软岩、“软-硬”互层二元结构和水-岩(土)相互作用是主导滑坡发育的主要影响因素;(3)大多数滑坡涉水,主要发育在10°~30°斜坡上,前缘高程集中在100~175 m,受库水波动影响严重,岸别和斜坡结构对堆积层滑坡发育没有明显控制作用;(4)库区滑坡主要由降雨-库水下降联合诱发滑体前缘滑移-拉裂,引发牵引式滑坡,降雨与库水波动各自对滑体的影响格局和程度存在明显差异。以期研究成果为有针对性的库区滑坡总体防治提供一定的科学指导。

       

      Abstract: Geological disasters occur frequently in the Three Gorges Reservoir Area(TGRA). Colluvial landslide is the most common type of landslides with the largest total amount. Information of 145 colluvial landslides on the reservoir bank in TGRA are systematically collected. This paper selects landslide topography, geological lithology, and slope structure as the controlling factors, and precipitation and reservoir water fluctuation as the main inducing factors. It characterizes the distribution and deformation and failure response of the landslides under these factors. The mechanisms of landsliding are analyzed. The main conclusions are as follows. (1)Under the dominance of regional tectonics and bedrock stratigraphic lithology, the occurrence frequency and scale of landslides have obvious spatial differences along Yangtze river. (2)Lithology combinations of sandstone and mudstone intercalated with shale and coal seams(SC), and marl and shale intercalated with mudstone(MSM) are the most harmful to landslide stability. The existences of soft rock,"soft-hard" interbedded dual structure, and water-rock(soil) interaction are the main influencing factors that dominate the development of landslides. (3)Most of the landslides are wade into river, locate on the slopes of 10°~30°, and have the elevation of the front edge mainly concentrated at 100~175 m above sea level. These slopes are seriously affected by the fluctuation of reservoir water. The river sides and slope structures have no obvious effect on the colluvial landslide development. (4)The landslides are mainly caused by the joint influences of rainfall and reservoir water drew-down. The joint influences can result in the slip-cracking deformation at the front of sliding body, which triggers retrogressive landslides. There are obvious differences in the pattern and extent of the impact of rainfall and reservoir water fluctuations on landslides. The research results are expected to provide scientific guidance for the overall targeted landslide prevention and control in the TGRA.

       

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