岩土工程学报2025，Vol.47Issue(z2)：36-41,6.DOI:10.11779/CJGE2025S20024
防渗墙-复合土工膜U型接头变形性能离心模型试验
Centrifugal modeling of deformation performance of U-shaped joints between cutoff walls and geocomposite membranes
摘要
Abstract
The connection between cutoff walls and geocomposite membranes is a critical impervious system widely used in cofferdam engineering,where the deformation compatibility at the joint directly governs the reliability of the impervious system.Focusing on a specific cofferdam project,this study designed two connection types:a conventional folded expansion joint and a U-shaped expansion joint internally filled with deformable foam.Four sets of centrifugal model tests are conducted to simulate the strain characteristics of the geocomposite membrane due to relative displacement between the cutoff wall and the membrane.The test results reveal:The strain in the geocomposite membrane decreases with increasing distance from the cutoff wall.For the folded expansion joint,anchored flush with the cutoff wall,the end restraint("clamping effect")induces significant localized strain concentration in the membrane.In contrast,the U-shaped expansion joint can effectively mitigate localized strain concentration.Furthermore,the deformable foam filling at the transition zone between stiff and soft materials within the U-type joint helps reduce differential settlement between the cutoff wall and the cofferdam fill,thereby improving the localized stress state of the geocomposite membrane.关键词
防渗墙-复合土工膜连接/U型伸缩节/变形协调性/离心模型试验/应变集中Key words
cutoff wall-geocomposite membrane connection/U-shaped expansion joint/deformation compatibility/centrifugal model test/strain concentration分类
建筑与水利引用本文复制引用
李从安,张振忠,李波,邱金伟,郑郧..防渗墙-复合土工膜U型接头变形性能离心模型试验[J].岩土工程学报,2025,47(z2):36-41,6.基金项目
国家自然科学基金项目(52208329) （52208329）
武汉市知识创新专项曙光计划项目(2023020201020359) （2023020201020359）
中央级公益性科研院所基本科研项目(CKSF2023326/YT) （CKSF2023326/YT）
安徽省引江济淮集团有限公司科技项目(YJJH-ZT-ZX-20230118528) （YJJH-ZT-ZX-20230118528）
