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The tension-strain behaviour of geotextiles, under uniform loading, is dependent on several factors, mostly on the intrinsic properties of geotextiles, on the overburden pressure imposed on the geotextiles by the soil confinement, on the interface soil-geotextile frictional behaviour, and on the properties of soil surrounding the geotextile. To evaluate the above mentioned factors, several tests have been developed in the last years.
The present paper illustrates the in-soil tensile test results of two nonwoven geotextiles using the apparatus illustrated by McGown et al. (1982) with two kind of sand as confinement. Finally a qualitative interpretation is prop_osed to explain the influence of confinement effect on the nonwoven tension-strain behaviour in terms of macrostructure of the products.