Elastoplastic Constitutive Model for Energy Dissipation and Crack Evolution in Rocks

Le résumé fourni par la source

The construction of an elastoplastic constitutive model for energy dissipation and crack evolution in rocks is crucial for accurately predicting their failure processes. This study first constructs a theoretical elastoplastic constitutive model by analyzing the mechanical properties of rocks, energy dissipation, and crack evolution under conventional triaxial compression. Subsequently, a three-dimensional finite difference scheme for the theoretical model is derived to implement a numerical algorithm. Finally, using argillaceous siltstone as an example, the validity of the theoretical model and its algorithmic implementation is verified through experimental testing, result analysis, model construction, secondary development, and numerical simulation. The research indicates that the dissipated energy is equal to the integral of the stress–strain curve minus the elastic strain energy, which can be quantitatively described using strength parameters. The volumetric strain of cracks is equal to the plastic volumetric strain, which can be indirectly quantified using the dilation angle. The simulated stress–strain curves closely align with the experimental data, and the simulated dissipated energy and crack volumetric strain are consistent with the theoretical calculations, confirming that the theoretical model effectively captures the nonlinear mechanical behavior, energy dissipation, and crack evolution of rocks.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.