Abstract：Using a special contact interface element and a proposed bolt element to simulate the slip surface and prestressed anchorage cable respectively，stability analysis for an instable block located in left abutment slope of Jinping Hydropower Station is carried out by software FINAL. The influence of discontinuous structures and the stiffness and prestress of the prestressed anchorage cables on the stability，the stress and displacement fields of the high rock slope are fully considered. The results of the numerical analysis indicate that the prestressed anchorage cables obviously improve the stability of the slope，especially when the slope is subjected to seismic loads. At the same time，the results also explain the reinforcement mechanism of the prestressed anchorage cables. The obtained results are of great significance to optimize the design of the prestressed anchorage cable.
