Particle size effect on the mechanical behavior of coral sand – geogrid interfaces Available to Purchase

Particle size distribution (PSD) of coral sand is a critical factor that influences the mechanical properties at the coral sand-geogrid (CS-GG) interface, affected by both particle breakage and various temperatures. However, relevant research is currently scarce. This study conducts a series of large-scale interface shear tests on coral sand with three PSD ranges (0.25 ∼ 1 mm, 1 ∼ 2 mm, and 2 ∼ 4 mm) at varying temperatures (5°C ∼ 80°C). Experimental results demonstrate that the I_B value at the CS-GG interface ascends and then descends with the increase of PSD from 20°C to 40°C. The I_B value at the interface descends and then ascends with the increase of PSD from 60°C to 80°C. The PSD curves at the interface indicate that the particle breakage degree of coral sand increases with rising temperature (5°C ∼ 40°C). The larger PSD of coral sand, the smaller fractal dimensions (D) of the interface. A mathematical formulation of the relationship between the relative breakage rate (B_r) and the D value at interfaces is presented, which considers temperature effects. The relationship between the total input energy (E) and the B_r value has been expressed by empirical formulations with different PSD ranges, where the fitting curve for 2 ∼ 4 mm coral sand exhibits a hyperbolic pattern.