Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of Surface Roughness on Soil-Geogrid/Geotextile Interface Shear Strengths
To get some insights on the effect of surface roughness on the interface shear strength, interface direct shear tests were conducted using two sandy soils (M1 and M2) and 4 geogrids (GG) and 5 geotextiles (GT) with difference surface roughness. The normalized surface roughness (Rn) and the asperity ratio (AR) are used as indexes for surface roughness. Rn is the ratio between average asperity height and D50 of a soil, AR is the ratio of the half spacing between two adjacent asperities and D50. For interface friction angles (δ), the test results indicate that Rn (> 0.06) had a positive effect on increase δ and resulting in δ > ϕ (internal friction angle of a soil). There is no clear tendency of the effect of AR on δ. For (apparent) interface adhesion (ca), there are different tendencies for M1-GG and M2-GT interfaces. For M2-GT interfaces, there is a tendency of increase ca with increase of Rn value. While, for M1-GG interfaces, for the conditions tested, there is a tendency of increase ca with decrease of AR value. Further, in terms of δ/ϕ and ca/c (cohesion of a soil) ratios, generally, the average values for M2-GT interfaces are higher than that of M1-GG interfaces. The reason considered is the interaction between soil particles and the surface fibers of the GTs, i.e. the soil particles plowed on the surface of GTs.
Effect of Surface Roughness on Soil-Geogrid/Geotextile Interface Shear Strengths
To get some insights on the effect of surface roughness on the interface shear strength, interface direct shear tests were conducted using two sandy soils (M1 and M2) and 4 geogrids (GG) and 5 geotextiles (GT) with difference surface roughness. The normalized surface roughness (Rn) and the asperity ratio (AR) are used as indexes for surface roughness. Rn is the ratio between average asperity height and D50 of a soil, AR is the ratio of the half spacing between two adjacent asperities and D50. For interface friction angles (δ), the test results indicate that Rn (> 0.06) had a positive effect on increase δ and resulting in δ > ϕ (internal friction angle of a soil). There is no clear tendency of the effect of AR on δ. For (apparent) interface adhesion (ca), there are different tendencies for M1-GG and M2-GT interfaces. For M2-GT interfaces, there is a tendency of increase ca with increase of Rn value. While, for M1-GG interfaces, for the conditions tested, there is a tendency of increase ca with decrease of AR value. Further, in terms of δ/ϕ and ca/c (cohesion of a soil) ratios, generally, the average values for M2-GT interfaces are higher than that of M1-GG interfaces. The reason considered is the interaction between soil particles and the surface fibers of the GTs, i.e. the soil particles plowed on the surface of GTs.
Effect of Surface Roughness on Soil-Geogrid/Geotextile Interface Shear Strengths
Int. J. of Geosynth. and Ground Eng.
Chai, Jin-chun (Autor:in) / Saito, Akinori (Autor:in) / Hino, Takenori (Autor:in)
01.06.2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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