Abstract
It is very important for aiding a safety designing with geomembrane to know stress and strain of the geomembrane installed on the ground of landfill. The relaxation test with constant strain and tensile test with the specimen after creep test had been conducted. After comparison of the stress-strain curve after and before relaxation test at 5% strain, the secant modulus obtained from curves are almost the same. So, when the stress of geomembrane is used for designing under the strain increasing condition, the decreasing of stress by relaxation must not be included in the stress calculation of stress.
