| The stability analysis of slope is always an important problem in civil engineering, landslide deformation failure is a kind of serious geologic disaster. At present, the most common problem of slope is the stability of high rock slope in the hydropower engineering, and high rock slope stability is directly deciding the feasibility of the hydropower engineering, by which the construction investment and the operation security are also affected.In the analysis of high rock slope stability, the key problems are how to ascertain the most dangerous slide path and the safety factor and how to judge the calculated slope's states, stability or instability. This paper is relied on the big hydropower engineering (Jinping I Hydropower Station), analyzing the stability of high rock slope in IV—IV mountain downriver of the dam.(1) Based on deep research of engineering and detail reconnaissance of landform and complicated geological situation, the potential failure modes of the rock slope can be found and also the stability of the slope can be better analyzed.(2) Based on limit equilibrium method and stereographic projection method, the stability of the deep layer slide and the superficial layer slide can be analyzed. Otherwise, various factors affecting the stability of rock slope are also analyzed.(3) Based on using the software ADINA, the stress state and transformation state of a slope in practice can be analyzed. And then, the strength reduction method is used for ascertaining the rock slope stability and comparing the veracity and practicability of the two failure evaluation criterions.(4) Comparing the limit equilibrium method and FEM used in this text, it shows that combining the two methods in analyzing the complicated high rock slope is reasonable and practical.
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