Abstract
Many types of Flexible Membrane Liner (FML) made of HDPE, TPO, FPA, EPDM and soon are used as a component of a liner system in waste landfill. But the FML spread on the bottom may create a tensile strain when the bottom subsides partially. In this paper, the authors conducted trapped door tests to confirm the area of FML where it deformed and to find the distribution of tensile strain creating in it. They also measured the change of vertical pressure acting on the FML according to the settlement of the modeled base. Based on the experimental results, they presented modified non-linear elastic model to calculate the maximum tensile strain where the redistributed vertical pressure was considered. As the result, it was recommended that the allowable partial settlement of the FML is about 15cm and 25cm for HDPE FML and FPAFML, respectively
