Abstract
The shear strength of geomembrane welding seams (GWSs) is one of the key factors for the reliability of geotechnical anti-seepage system. In order to study the evolution law of shear strength of GWSs under different inflation time and pressure, the weld shear strength tests of seven different thicknesses of HDPE geomembrane were carried out under different inflation time and pressure conditions. The test results show that the weld shear strength increases with the increasing geomembrane thickness under the same inflation time (3min or 10min) or the same test inflation pressure (0.1MPa or 0.2MPa). Additionally, the trend of all test curves is similar. The hot-welding method shows good stability in weld shear strength of different thicknesses of HDPE geomembrane. The shear strength values of GWSs of the same thickness under different inflation pressures and inflation times are similar. During the shearing process of the welds, the weakened area of the material at the joint between the edge of the weld and the geomembrane base material is most likely to be destroyed. The corresponding test results can provide reference for GWS inspection and related engineering.
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