| Hongjiadu hydraulic power plant is the only leading water storage reservoir of Wujiang cascade hydraulic stations, which is a full-time storage reservoir.2*landslide body is distributed at the right side of downstream, which is just located in the region of energy dissipation. Erosion gully may cut the bottom of the landslide body. There are roads on the top of the landslide body during the construction period and operating period. So the collapse of 2#landslide body will affect failure-free operation of the power plant.Because of the serious consequences caused by slope failure, the study of safety factor against sliding and reinforcing structure's design and analytic method is concerned by lots of engineers. At present, limit equilibrium method is one of the conventional slope stability analysis methods. It can't consider nonuniformity of mechanical characteristic of landslide body and its rock bed and the effect of stress distribution on the gilding surfaces, since the rigid body assumption is adopted in this method. Furthermore, this method can't accurately consider inactive forces between slices. The routine finite element analysis method is another conventional slope stability analysis method. However, it doesn't work if all nodes on the sliding surface are in the yield states or actual safety factor against sliding is less than one. In this paper, based on some previous scholars' excellent study fruits, the finite element iteration method for stability safety factor of landslide body against sliding is presented, when using this method, the thin layer element is used to simulate interlayer and structural joint for sliding surfaces. Firstly, an example with a theoretical answer, which is named safety factor solution of vertical slope with a concentrated force, proves the correction of this method. Secondly, safety factor of a landslide body with a polygonal sliding surface is analyzed in this paper. The results demonstrate that this method can consider that the different material stiffness parameters in the landslide body have an effect on the safety factor. Finally, the safety factor of a three-dimension landslide body with a spherical sliding surface is calculated with this method, and the applicability of this method for three-dimension slope is verified after comparing the result with theoretical answer. On the basis of these conclusions, the stability of natural 2#landslide body of Hongjiadu hydraulic power plant is analyzed with this finite element iteration method and the uniform value off on the sliding surface of the landslide body is inversed. Meanwhile, the stability of scaled 2#landslide body of Hongjiadu hydraulic power plant is analyzed and downslide force of scaled 2#landslide body and normal stress and shear stress on the sliding surface are obtained. In addition, the results provide a reference for reinforcing structure's layout.Generally, structure's stresses, not internal force, can be obtained by analyzing discrete structures with routine solid elements, but internal forces of structure such as moment, axial force and shear force are required in the design criterions which are working in the design of hydraulic structures and industrial and civil structures. A convenient method based on the equilibrium condition of internal force and element's stresses is presented in this paper. This method can directly solve constraining internal forces on the designated sections, and then solve the moment, axial force and shear force on the corresponding sections. So stresses needn't be fitted in the method. Internal forces of a non-yielding retaining wall arecalculated with this method in this paper. The results demonstrate that the methodmentioned in this paper is correct, reliable and rational. On the basis of the conclusions, thereinforcing structure's internal forces of 2 landslide body of Hongjiadu hydraulic power plant are analyzed with this method and the service behavior of the joint structures of anchor caverns and piles in the 2#landslide body is studied. At the same t...
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