"乌东德水电站左岸尾水边坡施工期变形及支护分析"

Abstract During the construction period of Wudongde Hydropower Station, the left bank tail-water slope experienced significant deformation. In order to ensure the long-term normal operation of the hydropower station, an analysis was conducted on the changes in rock mass deformation, anchor stress, anchor cable anchorage force, and surface deformation of the slope. The main areas and depth ranges of deformation were identified, and the stability of the slope was evaluated. The correlation between monitoring results and slope excavation support was discussed, and the main cause of the significant deformation of the slope was revealed. The results showed that the deformation mainly occurred in the hanging wall of the f1 fault, inward towards the mountain, at the junction of the tail water tunnel and the spillway tunnel, in the range of elevations 796-910 meters. The depth of deformation in the deformed area generally ranged from 10 to 20 meters. The deformation of the slope was closely related to the excavation of the slope and the excavation of the tail water outlet section. Unloading rebound after slope excavation and blasting vibrations during construction were the main causes of significant outward deformation of the slope. With the gradual implementation of support measures according to design requirements, the deformation of the slope has stabilized. Overall, the analysis of the left bank tail-water slope deformation and support force characteristics during the construction period of Wudongde Hydropower Station provides valuable insights into the factors contributing to slope instability and the effectiveness of support measures. By understanding the causes of deformation and implementing appropriate support measures, the long-term stability and safety of the slope can be ensured, ultimately contributing to the successful operation of Wudongde Hydropower Station.