Study on unit energy damage and prediction model of concrete under hydraulic impact

Based on the SPH-FEM (Smoothed Particle Hydrodynamics - Finite Element Method) coupling method, the hydraulic impact concrete model was established, and the numerical model was verified by hydraulic impact concrete experiments and CT (Computed Tomography) scanning experiments. Secondly, this paper proposes the comprehensive damage factor of unit energy consumption, and explores the damage law of unit energy consumption of concrete under different parameters and optimizes the hydraulic parameters by using image processing techniques. Finally, this paper analyzes the crushing process of concrete under hydraulic impact, and predicts the unit energy consumption comprehensive damage by the multiple linear regression model, the decision tree model and the GBDT (Gradient Boosting Decision Tree) model. The results show that the effects of different parameters on the comprehensive damage of unit energy consumption of hydraulic impact concrete changes in stages, and the concrete particles will completely fail when the concrete damage under hydraulic action accumulates to a certain degree and the von mises stress reaches a certain peak. Secondly, the prediction of the GBDT model is the best, and the study provides a theoretical basis and technical reference for the efficient and economic utilization of hydraulic impact concrete technology.