岩土工程学报2025，Vol.47Issue(11)：2431-2440,10.DOI:10.11779/CJGE20240239
抽水蓄能电站上水库防渗土工膜弹性变形性能试验研究
Experimental study on elastic deformation properties of geomembranes used as barriers in upper reservoir of pumped storage power stations
摘要
Abstract
Aimming at the deformation adaptability of geomembranes used as barriers in the upper reservoir of pumped storage power stations,a set of bubble inflation multiaxial tension testing equipment for geomembranes is developed.The experimental studies are conducted on the influence rules of the key factors including dimensions of specimen clamp,loading rates,and waiting time of deformation on the test results.Subsequently,a test method to simulate the elastic recoverable deformation properties of geomembranes under fluctuating water levels is formulated based on these findings.This method is applied to the comparative researches on the elastic deformation properties of HDPE,LLDPE and PVC geomembranes commonly used as barriers in the upper reservoir of pumped storage power stations.The experimental results indicate that the traditional uniaxial tensile test method has limitations.Under the multiaxial tensile conditions,the ultimate strains of geomembranes are significantly lower than those obtained from the uniaxial tensile tests.Under the multiaxial tensile conditions,the HDPE and LLDPE geomembranes exhibit pronounced yielding at relatively low strain levels,with elastic recoverable strain ranges of only 1%to 3%.In contrast,the PVC geomembranes do not exhibit significant yielding,with elastic recoverable strain ranges exceeding 22.8%.Moreover,thicker PVC geomembranes demonstrate greater elastic recoverable deformation capabilities and higher tensile strengths.In the selection of geomembranes for engineering design,the geomembranes with sufficient elastic recoverable deformation capabilities should be chosen based on the maximum deformation value of the seepage prevention structures.关键词
抽水蓄能电站/防渗/土工膜选型/多向拉伸试验/弹性变形性能Key words
pumped storage power station/seepage prevention/geomembrane selection/multiaxial tension test/elastic deformation property分类
土木建筑引用本文复制引用
赵泓宇,吴海民,束一鸣,易枫..抽水蓄能电站上水库防渗土工膜弹性变形性能试验研究[J].岩土工程学报,2025,47(11):2431-2440,10.基金项目
国家自然科学基金项目(51379069,51409083)This work was supported by National Natural Science Foundation of China Project(Grant Nos.51379069, （51379069,51409083）
