高拱坝水垫塘反拱底板衬砌结构的非线性静力分析

Nonlinear static analysis on ogee-type floor of plunge pool in high dams

本文利用Ansys程序对高拱坝水垫塘衬砌结构进行了全过程计算。在止水结构未破坏以前 ,衬砌块结构可以看作是作用在弹性地基上的板 ,利用点 线接触单元模拟水垫塘衬砌块结构之间的接缝以及衬砌与基岩的接触 ,并对衬砌块与拱端支座的连接形式进行了研究 ;在止水结构破坏后 ,衬砌块结构下部受到方向向上的脉动压力和时均压力 ,拱的作用表现出来 ,并且衬砌块与基岩之间的锚固钢筋开始作用 ,这时的结构可看作是一种“反吊拱”。本文利用弹簧单元模拟衬砌块与基岩之间的钢筋进行计算 。

The failure process of the ogee type floor of plunge pool is carried out.In the calculation,the floor plate is regarded as a girder laid on elastic foundation before the failure of water seal.Node line contact elements are used to simulate the slot between the plates and the interface between the plate and abutment.The connection between the plates and abutment are also studied.Once the water seal becomes invalid,fluctuating pressure will act on the beneath surface of the plate and arch effect and anchoring steel bar begin to work.The whole floor can be regarded as a reversed arch.The spring element is used to simulate the steel bar connecting the plate and abutment.The calculating of the plunge pool floor in Xiluodu Project is given for demonstration.