Abstract
Interactive shear strength and displacement between geosynthetics and geomaterials are important factors to assess the stability of the multi-liner systems installed in the slope as a sideliner for coastal landfill sites. In the present study, direct shear tests on multi-layered models were firstly conducted by using a new testing apparatus that could measure tensile forces induced in each component of the liner system when the top layer was suffered from the shear forces caused by the self-weight of the cover soil. The corresponding numerical simulations by elasto-plastic FEM were secondly conducted to clarify the effects of interaction between layers. It can be well understood that the interactive behaviours of layers in the multi-liner are governed by a) the interface shear strength between the layers that depends on the materials and b) the tensile stiffness of each geosynthetic component that depends on both the consisting materials and the structural conditions.
