Abstract
Characterization of a geosynthetic is necessary for its effective use in various field application of reinforced soil structure. In this paper, a new type of geosynthetic has been evaluated for its interaction properties for different backfill soils using direct shear device. The test results are compared based on the type of soils, inclusions, and interface mechanical properties. Three backfills soils (sandy, clayey, and pure sand) in combination with four different geosynthetics (one geotextile and three geogrids) were tested at various loading conditions in direct shear. Test results reveal that the stress-deformation behaviour of the geotextile and geogrid interfaces with sandy and clayey backfills can be defined as hyperbolic. For the pure sand-geogrid interfaces, the relationship is followed by displacement hardening and softening behaviour. The dilatancy behaviour of a particular soil-geosynthetic interface is found similar at all normal stresses. Both contractive and dilative nature is observed for the interfaces with pure sand. On the contrary, only negative dilatancy or contractive behaviour is observed for sandy and clayey backfills with the same geosynthetics. The test results reveal that the relationship of the interface shear strength with the normal stress is not linear in most cases. Based on the test results, a simplified nonlinear equation is proposed for the soil-geosynthetic interface shear strength envelops which was in good agreement with the experimental data.
Highlights
The practice of reinforcing the soil with various tensile inclusions has been widely implemented in geotechnical engineering for the last few decades
Both contractive and dilative nature is observed for the interfaces with pure sand
The test results reveal that the relationship between shear stress and relative displacement largely depends on the type of backfill rather than the type of geosynthetics
Summary
The practice of reinforcing the soil with various tensile inclusions has been widely implemented in geotechnical engineering for the last few decades. The interaction between soil and reinforcement is of utmost importance for the design and performance of reinforced soil structures, and this interaction can be very complex depending on the nature and properties of the reinforcement. Various types of geosynthetic materials have been used for soil reinforcement including geotextiles (woven and nonwoven), geogrids and geocells. Whatever the reinforcement and backfill materials are used for the design of a reinforced soil structure, the interaction properties of soilreinforcement interface play an important role. The interaction mechanism between the reinforcement and the soil can be classified into two types; sliding of soil over the reinforcement and pullout of reinforcement from the soil [1]. The direct shear and pullout tests are widely used methods to study quantitatively these interaction mechanisms
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