Interface friction of a soil-fabric-aggregate system

J. Bearden, Joseph F Labuz

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The use of geotextiles for reinforcing unpaved roads has grown significantly over the last few decades. This increase in use is attributed to the ability of a geotextile to strengthen a road and improve performance. One reinforcing mechanism is due to geotextile tensioning under significant rutting. In contrast, the effect of friction at the geotextile interface may be critical for estimating the performance of reinforced unpaved roads where significant rutting is not permitted. Interface friction allows for the transfer of shear stress from the gravel to the geotextile, thus relieving the subgrade of these damaging stresses. Assuming similar fabric moduli, it is anticipated that larger interface friction will be associated with better performance. From direct shear tests on soil-fabric-aggregate systems, it was determined that a nonwoven geotextile developed an interface friction angle comparable to that of the gravel alone, while lightweight slit film and heavyweight woven geotextiles have 20% lower interface friction angles.

Original languageEnglish (US)
Title of host publicationProceedings of the International Conference on Cold Regions Engineering
Number of pages12
StatePublished - Dec 1 1998
EventProceedings of the 1998 9th International Conference on Cold Regions Engineering - Duluth, MN, USA
Duration: Sep 27 1998Sep 30 1998


OtherProceedings of the 1998 9th International Conference on Cold Regions Engineering
CityDuluth, MN, USA


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