Calcareous sand is a natural foundation material for ports

airports and some civil buildings in ocean areas. Through the one-dimensional compression creep test of calcareous sand and the analysis of its micro-structure

it was found that the surface pore area decreased after creep and showed a dispersed distribution. In addition

the characteristics of instantaneous deformation

rapid deformation and attenuation deformation of the sample during the test were highly correlated with the particle size. The relative particle breakage rate and mass fractal dimension improved based on fractal theory were used to describe the degree of particle breakage after creep. The relationship between the decay of fractal dimension and creep with time

as well as the linear relationship between the fractal dimension of macroscopic mass and the fractal dimension of microscopic surface was obtained. On this basis

the fractal fracture behavior of calcareous sand with a single particle size group during long-term creep was analyzed at multiple scales

and the corresponding macro and micro cross-scale correlation was studied. The development of particle breakage and the variation of microscopic pores during creep were obtained. This study proved the rearrangement

crushing and grinding behavior of calcareous sand particles in the creep process

and revealed the creep mechanism of calcareous sand.