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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