Research on the breakage and fractal characteristics of calcareous sand

Calcareous sand is widely used in coastal engineering and island construction, which has the characteristic of easy crushing. A series of ring shear and one-dimensional compression creep tests were carried out for the crushing evolution under the influence of large deformation and time length effects. The mechanical characteristics and deformation properties of the single-graded specimens were analyzed, focusing on the crushing characteristics, and fractal properties under the action of different shear displacements, stress levels, initial gradations and creeping motion effects. The results show that the fractal dimension is positively correlated with crushing, the increase of shear displacement, stress level, and initial mean particle size has a facilitating effect on crushing. Under large deformation conditions, this promoting effect gradually tends to slow down, and the characteristic of limit fractal exists. The creep behavior reflects the continuous deformation characteristics of calcareous sand, and the specimen as a whole is still in the stage of crushing development, and the effect of time duration on the fractal is limited.