Numerical Simulation of Rock Creep Behavior with a Damage-Based Constitutive Law

摘要: AbstractTime-dependent creep behavior of rocks is crucial not only for assessing geophysical hazards, such as earthquake rupture and volcanic eruption, but also analyzing the long-term stability rock engineering structures, underground mines excavations. In present paper, multiple stress-stepping tests on green sandstone under uniaxial stress conditions were performed. Results from experiments show that strain rates are highly dependent level applied stress. Then, a time-dependent model based damage constitutive law at mesoscale was proposed to heterogeneous brittle rocks. model, heterogeneity considered by assuming parameters following statistical Weibull distribution, both maximum tensile criterion Mohr-Coulomb used two thresholds control damage. The damage-based impl...