三峡工程二期围堰防渗墙结构非线性应力应变研究

A Research on Non-linear Stress-Strain for the 2nd-stage Cofferdam with Concrete Diaphragm Wall of the Three Gorges Project

本文为“三峡工程二期深水围堰‘七五’攻关课题——设计方案优化(16-4-1-6)子题”专项研究成果之一。运用数值分析的方法,论证了长委会和专家组推荐的高、低墙围堰方案的安全可靠性,研究表明,在对墙及基础部位采取适当工程措施后,方案均是可行的。 研究对比了不同性质填料对墙应力和变位的影响;并根据墙的主要问题是墙下端应力过大,有针对性地研究了几种施工简便易行的结构处理措施,它对改善墙体应力状态效果明显;论证了风化砂作堰体填料的可行性;同时对优化设计断面也作了分析研究。

This paper introduces the results of the research on non-linear stress-strain for the 2nd-stage cofferdam with concrete diaphragm wall of the Three Gorges Project.This paper also analyzes in detail the influence of various filling materials on stress-strain of the diaphragm wall. And because the stress at the lower end of the wall is excessively large,some measures were studied for an engineering treatment. The research results show that the measures may improve the stress condition of the wall significantly. The study also shows that the weathered sand can be used as filling material for the cofferdam. ^This paper provides valuable basis for the design of the 2nd-stage cofferdam.