桐子林水电站框格式地下连续墙设计研究

Dsign of Sash-shaped Underground Continuous Wall in Tongzilin Hydropower Station

桐子林水电站为雅砻江流域最后一个电站,该电站枢纽建筑物由重力式挡水坝段、河床式电站厂房坝段、泄洪闸(7孔)坝段等组成。采用明渠导流,导流明渠左导墙末端由于覆盖层深厚,不具备开挖建基条件,经多次比选和调研,选择框格式连续墙作为导墙基础,扩桩式十字槽段结构为水电工程中的新型结构,设计难度大。通过两年的监测数据表明,导墙稳定安全。

Tongzilin hydropower station is the last hydropower station along the Yalong river basin and the layout structures are composed of gravity retaining dam,the powerhouse dam on riverbed and the sluice dam section（7 holes）.Diversion channel was used,and the end of the left guide wall to the channel was found on the deep layers,the conditions were not fit to large-scale excavation.Based on the repeated comparison and research,sash-shaped underground continuous wall was chosen on the foundation of the left guide wall.It is the first time in large-scale use of the structure of piles with cross slot in hydropower projects,and is difficult to be designed.Two-year prototype observation data show that the guide wall is stable and safe.