| Summary: | This paper describes an experimental study that was conducted in a large scale direct shear apparatus in order to evaluate the influence of soil type on soil-geosynthetic interfaces shear strength. For the direct shear tests, two soils of different characteristics were used: a dry and poorly graded sand, classified as SP according to the Unified Soil Classification System and a cohesive well graded residual soil from granite, classified as SW-SM (well graded sand with silt and gravel), also in the dry state. In addition to soil type, other parameters that influence the interfaces shear strength were analysed, namely soil relative density and type of geosynthetic. With this purpose, two values of soil relative density were adopted and two types of geosynthetics were used: a uniaxial geocomposite for reinforcement and a nonwoven geotextile made of polypropylene.
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