岩土工程学报2012，Vol.34Issue(11)：2081-2086,6.
围堰防渗墙与复合土工膜联接型式离心模型试验研究
Centrifugal model tests on connecting form between cutoff wall and composite geomembrane of cofferdam
摘要
Abstract
The connection effectiveness between cutoff wall and composite geomembrane of cofferdam,both of which are usually applied in the cofferdam,plays an important role in seepage control.Based on the site invitation of stage II cofferdam of Three Gorges Project,three centrifuge tests are performed in order to reveal the mechanism of the connecting form of cutoff wall and composite geomembrane by measuring the displacements of the cofferdam fillings and cutoff wall and the strain of the composite membrane.The friction between the composite geomembrane and the cofferdam fillings is so large that the expansion deformation reservation cannot work.Two main influencing factors include the settlement of the weathered sand foundation and the lateral displacement of cutoff wall,which both play a decisive function in the fracture of the composite geomembrane.Furthermore,an improved method of the connecting form,which make the composite geomembrane not be tensioned,is proposed and validated by centrifuge tests.The improved method provides a reliable evidence for the design and construction of the seepage control system of cofferdams.关键词
围堰/复合土工膜/防渗墙/联接型式/离心模型试验Key words
cofferdam/composite geomembrane/cutoff wall/connecting form/centrifugal model test分类
建筑与水利引用本文复制引用
李波,程永辉,程展林..围堰防渗墙与复合土工膜联接型式离心模型试验研究[J].岩土工程学报,2012,34(11):2081-2086,6.基金项目
“十一五”科技支撑课题项目 （）
