Time-Dependent Creep Constitutive Model of Roadway Surrounding Rock Based on Creep Parameters

In order to better study the creep deformation characteristics of rock under different stresses, generalized Burgers model was used as basic after analyzing and its relationship with stress strain, application scope verified. Based on damage mechanics theory, a viscoplastic body considering aging established, which connected in series. A new nonlinear constitutive obtained, extended three dimensions. addition, between parameters variables established by introducing that considered effects. The unsteady is correctness rationality are verified test data. results show this not only accurately reflects attenuation steady stage but also overcomes defect difficult describe accelerated creep. Considering deterioration time, process states can be described, provides idea for establishing determining parameters.