Influence of matric suction on the shear strength of a cohesive soil-geosynthetic strap interface

Abstract:

This paper presents results and discusses the effects of seasonal climatic variations (wetting and drying) on shear strength of soil-geosynthetic straps interfaces under unsaturated conditions. The soil used for laboratory investigation was a compacted residual soil of gneiss composed of a silty-sand, from the São Paulo city, Brazil, and a high-tenacity polyester strap. Direct shear tests were conducted with three-different net normal stresses and levels of matric suction, besides the inundated condition. Results demonstrated that the cohesive soil used has excellent shear strength parameters, a high capacity to maintain negative pore water pressures and presents an efficient interaction with the geosynthetic strap. Furthermore, they indicate that the peak shear strength of the soil-geosynthetic interface increases nonlinearly with the soil suction, while the matric suction has a negligible effect on the post-peak shear strength of those interfaces.


Reference:
ORLANDO, Patrícia Del Gaudio; MARINHO, Fernando Antônio Medeiros. Influence of matric suction on the shear strength of a cohesive soil-geosynthetic strap interface. In: PAN-AMERICAN CONFERENCE ON UNSATURATED SOILS, 2nd., 2017, Dallas-Texas. Paper…

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