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Effect of Surface Roughness on Soil-Geogrid/Geotextile Interface Shear Strengths

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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.

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Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.


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The geogrid and geotextile specimens used in this study were provided by Maedakosen Co., Ltd., Japan. The authors appreciate their kind support for this study.

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Jinchun Chai: Conceptualization, Methodology, Analyses, Writing-original draft preparation, Writing—Review & Editing. Akinori Saito: Investigation, Formal analysis. Takenori Hino: Data curation, Validation.

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Correspondence to Jin-chun Chai.

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Chai, Jc., Saito, A. & Hino, T. Effect of Surface Roughness on Soil-Geogrid/Geotextile Interface Shear Strengths. Int. J. of Geosynth. and Ground Eng. 10, 43 (2024).

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