土木与环境工程学报（中英文）2026，Vol.48Issue(1)：110-117,8.DOI:10.11835/j.issn.2096-6717.2023.121
加载介质对HDPE土工膜鼓胀变形力学性质的影响
Influence of loading medium on mechanical properties of geomembrane bulging deformation
摘要
Abstract
In order to find out whether the loading medium has an effect on the mechanical properties of geomembrane bulging deformation,HDPE geomembranes with three thicknesses of 0.2 mm,0.3 mm and 0.6 mm were selected as the research objects.Using the special test equipment for bulging deformation,we used air and liquid as the loading media respectively.At the injection rate of 1 kPa/s,the spherical bulging deformation test under annular constraints was carried out,and the microscopic morphology changes and differential failure mechanisms of geomembrane bulging failure were emphatically analyzed by means of a polarizing microscope.The results show that under the same environmental conditions,the bursting pressure under liquid bulging is about 34%higher than that under air bulging,and the bulging height under liquid bulging is about 22%higher than that under air bulging.The bulging deformation of geomembranes under air and liquid bulging shows different stages of elastic,yield,strengthening and failure deformation.The geomembrane presents a linear failure surface during air bulging,which is manifested as uniform tensile deformation and fracture of the polymer chain segments at the micro level.The geomembrane presents a banded failure surface during liquid bulging,which is manifested as uneven tensile deformation and fracture of the polymer chain segments at the micro level.The influence of the loading medium on the mechanical properties and failure characteristics of the spherical bulging deformation of the geomembrane is mainly related to the properties of the medium itself,the distribution of pressure load under the membrane and the reorientation and recrystallization of polymer chains.According to the research results,it is recommended to use liquid medium to carry out the strength test for the bulging failure of the geomembrane.关键词
土工膜/压力介质/气胀/液胀/鼓胀变形/破坏形态Key words
geomembrane/pressure medium/air bulging/liquid bulging/bulging deformation/damage mode分类
建筑与水利引用本文复制引用
李政,李旺林,汪万升,于海瑞,薛霞..加载介质对HDPE土工膜鼓胀变形力学性质的影响[J].土木与环境工程学报（中英文）,2026,48(1):110-117,8.基金项目
山东省自然科学基金(ZR2019MEE106) Shandong Provincial Natural Science Foundation(No.ZR2019MEE106) （ZR2019MEE106）
