三峡工程隔流堤结构应力变形的有限元分析

Finite Element Analysis on Stress and Deformation of Partition Dikes in Three Gorges Project

三峡水利枢纽下游引航道的开挖在干地条件下进行施工,要求隔流堤具有防渗功能.防渗体主要为单摆喷防渗墙.在引航道抽水时发现隔流堤发生异常变形及渗漏问题.以实测的材料性能指标作为计算参数,模拟实际的施工过程,用有限元法对隔流堤结构应力变形进行分析,解释了航道侧抽水后隔流堤边坡有局部滑动及子堰出现裂缝等现象产生的原因.分析结论可为类似工程的设计和施工参考.

The downstream navigation channel of the Three Gorges Project is excavated on dry land,which requires that the partition dikes should prevent leakage.The main part of the cutoff wall in these dikes was completed by single swing-jet grouting.During pumping unexpected deformation and leakage were occurred in the partition dikes.This paper studies the stress and deformation of the partition dikes using finite element method(FEM)analysis modeling to the actual construction process and parameters obtained by testing.On the basis of the results calculated,the reasons for the cracks and the partial slippage on the slope of partition dikes in the cofferdam during pumping were explained.The conclusions could make reference to design and construction in correlative projects.