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本文介绍了三峡工程一期围堰及其混凝土防渗墙应力应变非线性有限元计算情况,对采用风化砂壳建一道混凝土防渗墙和在防渗墙上接壤土心墙方案进行了比较计算。分析表明,建一道混凝土防渗墙方案,对墙的应力及堰体的稳定均可满足设计要求;而在混凝土墙上接壤土心墙方案,对堰体的稳定是不利的。 本文为三峡一期围堰的初步设计提供了依据。
This paper introduces the nonlinear finite element analysis of the stress and strain of the first stage cofferdam and the concrete impervious wall of the Three Gorges Project and compares the scheme of building a concrete cutoff wall with the weathered sand shell and the earth core wall bordering the earth on the cutoff wall . The analysis shows that the plan of building a concrete cutoff wall can meet the design requirements for both the wall stress and the stability of the dam body. However, the scheme of bordering the core wall on the concrete wall is unfavorable to the stability of the dam body. This article provides the basis for the preliminary design of the first-stage cofferdam.