Study on the Elastoplastic Damage-Healing Coupled Constitutive Model of Mudstone

Abstract

Under the effect of high ground stress and water-rock chemical interaction, the fractures in the damaged mudstone wound undergo a self-healing process and recover the physical and mechanical properties, which has a significant impact on the wall-rock's stability of high level radioactive waste repository and the migration of radioactive nuclide. According to the general thermodynamics and continuum damage mechanics, an internal variable describing mudstone healing properties is introduced and an elastoplastic damage-healing model reflecting mudstone deformation, damage, and self-healing evolution is put forward. This model is used to simulate the triaxial compression test of mudstone under different confining pressures, whose simulated results are compared with the test data. It is indicated that the model could embody the main mechanical properties of mudstone with the healing effect in an effective way, and the healing part of the model has a great influence on the simulated results.

Continuum Damage-Healing and Super Healing Mechanics in Brittle Materials: A State-of-the-Art Review

“…For more details of the formulation and application of Equation 24, the reader can refer to [100][101][102][103][104]. Xu et al [105] implemented an elastoplastic damage healing model of mudstone and defined the healing variable as function of the non-associated dissipation criterion. Unlike the expression of the healing variables defined in Equations (6) and 8, a new healing variable equation is expressed as…”

Effect of Moisture on the Macro Failure Characteristics of Weakly Consolidated Mudstone: Mesomechanism

“…Through the three-point bending test, it is clear that the brittle failure or ductile failure of mudstone is related to the stratification plane reflected by the specimen, and the anisotropy of mudstone will increase significantly under different moisture contents [27]. Under the action of high in situ stress and waterrock chemical interaction, wounds and fractures of damaged mudstone can heal themselves and restore their physical and mechanical properties [28]. Shear creep characteristics of fractured mudstone are related to axial pressure and fracture length.…”