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http://dx.doi.org/10.7843/kgs.2022.38.2.29

A Study on Friction Anisotropy between Sand and Surface Asperities of Plate Using Modified Direct Shear Test  

Lee, Seung-Hun (Dept. of Civil Engrg., Sunchon National Univ.)
Chong, Song-Hun (Dept. of Civil Engrg., Sunchon National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.38, no.2, 2022 , pp. 29-38 More about this Journal
Abstract
The friction anisotropy of shear resistance can be selectively used in geo-structures. For example, larger axially loaded deep foundation, soil nails, and tiebacks increase load carrying capacity due to induced large shear resistance while pile penetration and soil sampling produce minimal shear resistance. Previous studies confirmed direction-dependent shear resistance induced by interface between soil and surface asperity of plate inspired by geometrical shape of snake scale. The aim of this paper is to quantitatively evaluate interface friction angle with different surface asperities. Using the modified direct shear test, a total of 51 cases, which sand are prepared at the relative density of 40%, are conduced including 9 plates, two shear direction (shearing direction against the height of surface asperity is increased or decreased during shearing test), and three initial vertical stress (100 kPa, 200 kPa, 300 kPa). Experimental results show that shear stress is increased with higher height of surface asperity, shorter length of surface asperity, and the shearing direction that the height of surface asperity increases. Also, interface friction angle is decreased with larger surface asperity ratio, and shearing direction with increasing height of surface asperity produces larger interface friction angle regardless of the surface asperity ratio.
Keywords
Friction anisotropy; Interface friction angle; Modified direct shear test; Shearing direction; Surface asperity;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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