张峰水库左坝肩防渗墙应力分析

山西张峰水利工程大坝左坝肩低液限粘土坝基上设有混凝土防渗墙,墙身深入坝体心墙内,该墙是坝体防渗的关键部位。通过非线性数值分析方法,对采用不同材料和施工工艺情况下,防渗墙的应力进行了分析,得出:采用塑性混凝土可以减小墙体应力,提高墙体的抗裂性能;在坝体不高的情况下,调整施工工艺,将先打防渗墙后筑坝改为先填筑坝体再进行防渗墙施工的工艺,更将大幅度减少墙体应力,提高防渗墙的抗裂性能,从而将提高大坝的防渗性能。

Stress Analysis on Cut-off Wall in Left Dam Abutment of Zhangfeng Reservoir

In left dam abutment of Zhangfeng Hydraulic Project in Shanxi Province,a concrete cut-off wall is situated,which is the key part for the seepage control of the dam.With the nonlinear numerical analysis,the stress of the cut-off wall in different materials and different construction methods is analyzed.The results show that using the plastic concrete in cut-off wall can reduce the stress of the wall,and if the height of dam is low,constructing cut-off wall behind dam reclamation can greatly reduce the stress of the wall,and can decrease the crack resistance of the wall,so can improve the seepage control capability of the dam.