糯扎渡水电站水库蓄水后库岸稳定性评价

Bank stability evaluation of Nuozhadu Hydropower Station after reservoir impoundment

水库蓄水后岸坡的坍塌变形、失稳破坏已成为影响水利水电工程安全运营的关键问题。糯扎渡水电站库区范围广,库岸地质条件复杂,岸坡塌岸问题普遍而突出。根据岸坡地质结构特征、库岸再造范围及库岸变形破坏特征,结合监测资料对重点岸坡变形进行了分析。初步探讨了糯扎渡高坝大库蓄水后库岸变形破坏随时间的发展演化规律,总结了新增岸坡变形破坏的特征与规律,评价了典型库岸的滑坡特征、稳定性及对工程与周边环境的影响。相关结论可对同流域和类似的高山峡谷型岸坡变形破坏预测评价提供一定的参考和借鉴。

The collapse deformation and destabilization of bank slope after reservoir impoundment have become the key problems affecting the safe operation of hydropower projects.With a wide reservoir area and complex geological conditions of reservoir bank,the problem of bank slope collapse of Nuozhadu Power Plant is common and prominent.According to the geological structure characteristics of bank slope,reconstruction scope,deformation and failure characteristics of bank,the deformation and failure characteristics of key bank slopes were analyzed by monitoring data.The evolution law of deformation and failure of bank with time after impoundment of Nuozhadu high dam reservoir was preliminarily discussed.We summarized the characteristics and laws of deformation and failure of new bank slope,evaluated the characteristics and stability of typical bank landslide and its impact on the project and surrounding environment.The relevant conclusions can provide some reference for the prediction and evaluation of deformation and failure of the same basin and similar alpine canyon bank slope.