关键词: 岩石力学, 施工技术, 大型水电工程, 三峡工程, 金沙江梯级水电站

Abstract: The construction of China Three Gorges Project and the four cascade hydropower stations in the lower Jinsha River encountered a great number of challenged rock mechanics problems due to their large scale and the complex geological conditions. According to the experiences accumulated in rock mechanics engineering practice in the above five large-scale hydropower projects, we reviewed the countermeasures towards the high side slope and landslide problems, dam foundation and dam abutment rock engineering problems, underground cavern groups rock engineering problems and high geo-stress and high seismic intensity problems. A series of key technologies adopted during the construction of these five hydropower stations were reviewed, such as the technologies for the stability of high side slopes of Three Gorges ship lock, Xiluodu and Wudongde, anti-sliding technologies for the Three Gorges dam and Xiluodu arch dam foundation rock masses, technologies for the stability of the surrounding rock masses in the underground caverns of Three Gorges and Xiangjiaba Hydropower Stations, and the comprehensive prevention technologies for giant landslides. Based on these practice experiences, we proposed a common technical route for the rock mechanics research works in large hydropower projects. First we should pay attention to the investigation and engineering geological mechanical model analysis. Then the rock masses should be described with reasonable medium model and equivalent continuum parameters. With the geo-stress as the initial analysis conditions, the rock masses stability can be assessed with appropriate continuum or non-continuum mechanics methods in order to determine the reinforcement schemes for the rock mass. Feedback analysis must be done according to field monitoring.

Key words: rock mechanics, construction technology, large scale hydropower station, Three Gorges Project, cascade hydropower stations on Jinsha River