瀑布沟大坝基础防渗墙廊道连接型式研究

Research for the Joint Type by Gallery Between Dam Imperious Wall and Core Wall of Pubugou Project

为了解决瀑布沟水电工程中大坝基础防渗墙与心墙的连接问题,采用非线性有限元方法,分析了瀑布沟大坝基础防渗墙通过廊道与心墙连接的不同构造形式下,坝体和防渗墙的应力应变以及心墙、廊道位移情况。分析表明:廊道高出底面10m,刚性接头、廊道顶部高塑性粘土厚度6m,防渗墙厚度1.2m的构造型式,混凝土防渗墙和心墙应力较小,能满足墙体材料强度要求,且心墙具有足够的抗水力劈裂能力,可作为推荐方案。

The joint type between dam imperious wall and core wall is key to Pubugou dam. The paper analyzes stress and strain of the dam and imperious wall and compares the core wall and gallery with different structural types. Method of nonlinear analysis is adopted. The structure that the gallery is 10 m higher than the core base face, with the rigid junction, 6 m thick clay in the top, of the gallery and 1.2 m thick impervious wall is recommended. For this structure, not only stress of the imperious wall and the core wall is lower than material strength, but also it is enough for its core wall to resist the hydraulic fracturing.