Abstract
This paper presents the results of a laboratory investigation into soil-concrete interface behaviour for application to the finite element analysis of retaining walls. The interface tests were carried out through the modification o the NGI simple shear apparatus. Three different soils and two concrete surfaces of different texture were examined. Some interface tests were also undertaken with a filter fabric. The experimental results show that for a particular soil-concrete interface, the shear stress-interface deformation plots for various normal loads can be characterised by a single curve through a normalisation procedure. The interface shear strength is dependent upon the concrete surface texture and the clay content of the soil. The results also show that large shear strains in the soil are necessary to fully mobilize the interface skin friction. The effects of interface dilation are found to be negligible. (Author/TRRL)
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