Abstract
In this paper, influence of different types of soils and geosynthetics on soil/geosynthetics interface behaviouris investigated by direct shear and pullout tests. Three different types of cohesionless soils and three different types of geosynthetics materials are adopted for experimental investigation. A series of large direct shear tests and pullout tests were conducted to investigate the interface behaviour of soil/geosynthetics. The test equipment, soils, and geosynthetics properties are described. The influence of soil particle size (D 50) and geosynthetic structure are discussed by analysing tests results. Results are presented and discussed in terms of peak shear resistance, peak pullout resistance, interface friction angle, efficiency factors and interaction coefficient for different soils and geosynthetics. It could be seen that the interface friction angle from both direct shear and pullout tests linearly increases with increase in (D 50) of soil. The pullout interaction coefficients (C i ) are found to be in the range of 0.62–1.72 for different tests conditions.
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