Triaxial Compressive Experiment of Failure Complete Process of Sandstone Corroded by Chemical Solution and the Evolutionary Neural Network Constitutive Model

摘要

The triaxial compressive tests for sandstone specimens corroded by different chemical solutions are concudted and their complete stress-strain processes are obtained. The characteristics of chemical corrosion effect on various stages of the complete stress-strain curve are analyzed. The law of the deformation and strength of sandstone corroded by different chemical solutions is obtained. The evolutionary neural network constitutive model is established to describe the stress-strain relationship of specimen by applying the theory of evolutionary computation and neural network. It is indicated that the evolutionary neural network constitutive model can better describe the mapping relationship between stress and strain of rockmass under chemical corrosion environments. The predicted results are in good agreement with the experimental results.