Constructive model construction method considering calcareous sand particle crushing

The invention relates to a constitutive model construction method considering calcareous sand particle crushing. The method comprises the steps that the stress state of a calcareous sand foundation is determined; determining a shear expansion equation based on a critical state theory; calcareous sand particle crushing is considered, and the relation between relative crushing and crushing plastic work is established; a double-yield-surface function is determined by introducing a volume yield surface; and establishing a stress-strain relationship of the calcareous sand. Based on a critical state theory and a yield surface model, the invention provides a novel constitutive model method capable of comprehensively considering the strength, the shear expansion property and the particle breakage of the calcareous sand, and a set of model parameters is adopted to better simulate the dynamic response of the calcareous sand in different stress states and different relative compactibility. And the method has very import