The macroscopic mechanical behaviors of coral sand

such as high compressibility

shear and creep are closely related to the characteristics of coral particle crushing. The strain rate effect of coral particles is of great significance to study the strength and deformation characteristics of coral sand under different loading forms . The effects of loading strain rate on particle crushing strength

crushing mode and fractal dimension were studied by applying different rates of 0.1-50 mm/min on about 300 coral particles in crushing tests. The analysis results show that the crushing strength of coral grain follows the Weibull distribution law

and the characteristic crushing strength increases nonlinearly with the increasing of strain rate. Due to the increase of loading rate

the main splitting failure of coral particles appears prior to the surface grinding and local fracture

and the corresponding load-displacement curves show a transition of "multi-peak" pre- and post-peak. The fractal dimension and crushing energy density of broken coral grain are also rate-dependent and the positively linear relationship with the logarithm of strain rate indicates that the dissipated energy and damage degree develop with loading rate.