the performance under vehicle loading of an unbound granular pavement laid on a soft clay subgrade was compared with that of a similar pavement which included a fabric membrane between the granular material and the soil. the pavements were trafficked simultaneously by opposite wheels of a 2-axle lorry carrying 9.1 tonnes on the rear axle. transient stresses and strains, surface profiles and permanent strains were measured. no significant differences were observed in the magnitude of the transient vertical stress or strain in the soil, but the transient horizontal strains were less under the pavement with the fabric. after trafficking (364 passes), the pavement containing the fabric had deformed less and had suffered less permanent vertical strain in the lower layer of granular material and in the soil.(a)

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