Theoretical analysis and numerical simulation analysis of energy distribution characteristics of surrounding rocks of roadways

Abstract

Energy is the driving force for the failure of rock materials, and the deformation and failure of the surrounding rock of the roadway is the result of energy accumulation, dissipation and release. Based on the theory of elastic-plastic mechanics and the law of energy conservation, the total energy, elastic strain energy, dissipation energy and release energy of the surrounding rock of the roadway are deduced and analyzed, and the relationship between the energy of all the components is revealed. The energy model is developed based on the Fish language embedded in FLAC3D, and the rationality and accuracy of the energy model are verified through elastic and elastic-plastic theoretical analysis; Through the practical engineering application of the energy model, the similarities and differences in the energy calculation results of the surrounding rock of the roadway through the Mohr Coulomb and Mohr-Coulomb strain softening constitutive models are revealed, and it is pointed out that it is more in line with engineering practices to consider the post-peak deterioration of the mechanical parameters of rock. The energy evolution model of the roadway is established, revealing the space-time effect of energy distribution of the surrounding rock of the roadway under different excavation speeds and conditions, and proposing the time lag of energy evolution and the peak circle effect of the elastic strain energy related to rock burst disaster. The research results can provide references for the research of disasters such as impact ground pressure and large deformation of soft rock, and provide some theoretical guidance for the supporting design of the roadway with large deformation of the surrounding rock and impact danger.