Study On The Bedding Rock Landslide Development Rule And Failure Mechanism In Three Gorges Reservoir Area

This article take the Three Gorges Reservoir Area bedding rock landslide research material, emphasizing the field of geological research and geological process of the prototype analysis, the use of prototype combination of research and theoretical analysis, engineering geology and rock mechanics combination of geological analysis and numerical simulation of combined Ideas, from the engineering geological conditions, failure mechanism bedding several aspects of a comprehensive study of landslide stability. This study attempts not only to solve the practical problems of engineering subjects, and landslides in the Three Gorges reservoir area on the basis of bedding theories and methods have made some progress. Research on the above issues, draw the following conclusions:(1) In the Three Gorges Reservoir Area,bedding rock landslide widely distributed, and its failure strength than horizontal slope and reverse slope, is the highest probability of development of medium and large landslides landslide type. Area bedding rock landslides, mainly developed in parts of the syncline and anticline fold turning parts of the transition, and the ground soft and hard white or soft interlayer with thin strata among the main scale to large and medium. Bedding rock landslides are developed in the Triassic and Jurassic strata in the system or the hard and soft white soft interlayer with thin strata among the weak interlayer constitutes a controlling deep sliding surface (with), the rock mass deformation Or slide to maintain the original level after the regular continuity. Bedding rock landslide controlling factors is smooth and easy formation of its geological structure, the reservoir water and rainfall is loaded with power factor incentive.(2) The bedding rock landslide of Three Gorges Reservoir geological model which according to the geological structure of the slope, shape and smooth sliding surface deformation and failure mode were divided into three categories: flat-shaped monoclinic old landslide, on the steep bedding of slowly armchair Landslide, wavy bedding, or ladder-like landslide, which chairs the steep shape of slowly landslide along reservoir development is the most typical category. Extensive field research, based on the Three Gorges Reservoir Area bedding rock deformation and failure modes of landslide studies, summarized the bedding rock landslide failure modes: single oblique straight like old landslide deformation failure mode is Slip - (front) cut - bedding sliding; on the steep relief under the chair-like deformation of old landslide is the sliding failure mode - (front) Bending - bedding sliding; somewhere between the between the two Wavy bedding or ladder-like landslide deformation mode is sliding - collapse song - bedding sliding; also summed up the rock bedded Reservoir Landslide four failure mechanisms: cutting and lateral erosion of river instability Reservoir water buoyancy instability, deformation and failure of hydraulic failure, unstable slip zone softening soak.(3) Three Gorges Reservoir Area Yunyang County Liangshuijing landslide, rock slide on the bedding depth analysis of deformation mechanisms: first by engineering geological analysis of landslide deformation mechanism Liangshuijing geological analysis, and then use finite element software ABAQUS Liangshuijing landslide on the deformation under different conditions to perform a comprehensive analysis shows that: Liangshuijing water slide in the 175m pilot phase of deformation is mainly due to landslides intensified by the buoyancy effect of reservoir water, resulting in anti-resistance decreases Have led to the trailing edge of the pull-through cracks and landslides in central transverse cracks ; its instability in the form similar to the chairs on the shape of slowly along the steep slope to the failure mode, mainly for the leading edge of the evolution of creep deformation, bending slightly early after Edge generated tensile cracks, strongly curved - front uplift, slip cut and come out through the development of landslides.