Study on the Influence of Coarse Sand Physical Properties on Direct Shear Strength Characteristics

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This research aims to identify physical properties of coarse sand that correlate highly with its shear strength characteristics.
Conducted physical tests and direct shear tests on 30 types of coarse sand from different sources.
Evaluated the impact of surface roughness (FU value) and flatness ratio (c/b) on shear strength.
Analyzed how deformation modulus and particle strength influence shear strength under varying densities.
Confirmed that the friction angle and residual friction angle are significantly affected by FU value and flatness ratio (c/b).
Found that lower sample density reduces the physical properties' influence on direct shear strength characteristics.
Proposed using FU value as a management indicator for shear strength characteristics in coarse soil.

Experimental analysis uncovers key physical properties affecting shear strength in coarse sand, suggesting management metrics.

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Nonami et al. (2026) studied this question.

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