The analysis of design parameters for geotextile reinforced structures requires the evaluation of the mechanical properties of the reinforcing elements as close as possible to field conditions. The same applies for the measurement of bond strength between soil and reinforcement for design purposes. These aspects were investigated by a large number of in-soil tensile tests and direct shear tests with different soils and geotextiles (woven and non-woven) and the main results are presented and discussed in this work. General models of interaction between soil and geotextile were established based on the results obtained by mechanisms associated with the mobilised shear stresses, soil volume variations and geotextile deformability. The effects of the confinement on the geotextile stress-strain response were analysed in terms of reorientation of the textiles fibres as a function of the reinforcement stiffness.
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