Defensive Design of Concrete Gravity Dams

本工程研究了五种不同的混凝土坝防御性设计方案：1)在重力坝上部设置一个锁缝，上游面进行密封，以防止水入侵；2)改变截面轮廓以提高抗震性能，3)质量显著减小的轻质凸起部分，4)采用钢索垂直后张法，5)动水隔离。这些方案不同程度地适用于新建大坝的设计和既有大坝的改造。它们将由以前开发的用于混凝土重力坝-水基础系统的线性和非线性有限元分析的专用计算机程序进行研究。这种防御方案可以在新水坝的设计和现有水坝的改造中实施。

This project studies five different schemes of defensive design of concrete dams: 1) a keyed joint built into the upper part of a gravity dam which would be sealed at the upstream face to prevent water intrusion, 2) an altered cross-sectional profile for improved seismic resistance, 3) a light- weight crest portion with considerably reduced mass, 4) vertical post-tensioning of the neck region with steel tendons, and 5) hydrodynamic isolation. To varying degrees, these schemes are applicable to the design of new dams and to the retrofit of existing ones. They will be investigated by special computer program previously developed for linear and nonlinear finite element analysis of concrete gravity dam-water foundation systems. Such defensive schemes can be implemented in the design of new dams and in the retrofit of existing ones.