Abstract
A rock mass has a large number of macroscopic and microscopic defects, such as joint cracks and microcracks, which greatly affect its physical and mechanical properties. In this study, a multiscale elastoplastic damage model was proposed to describe the influence of the existence and evolution of two types of cracks on rocks. The macroscopic damage variable expressed by the stress intensity factor was derived on the basis of damage mechanics and fracture mechanics and regarded as a piecewise function with initiation stress as the dividing point. The rock was divided into two parts based on micromechanics: matrix and microcracks. The macroscopic damage was considered the deterioration of the mechanical properties of the rock matrix. Under the framework of thermodynamics, a constitutive model that could reflect the growth of macrocracks and the friction–damage coupling of microcracks was constructed. This model could reflect the physical mechanism of macroscopic and microscopic damage of jointed rock masses, so the physical parameters of the model had clear meanings. Lastly, the rationality of the model was verified via uniaxial compression tests of rock-like materials with a single flaw of different inclination angles.
Published Version
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