Improved nonlinear viscoelasto-plastic rheological model of rock and its correction of hardening coefficient of viscosity
Abstract：Under uniaxial loading instrument, the cyclic loading and unloading creep test on the sandy shale specimens of Dongxiang Copper Mine was done. Based on the hardening-damage mechanism of creep process, the timeliness of hardening-damag ing coefficient mechanism of e effect was proposed during the analysis of creep data. And then the coefficient of viscosity （ harden- viscosity） in the decay creep stage under high stress condition was corrected. Based on the creep damage in the stationary creep stage, the accumulation-diffusion mechanism of rock damage effect was put forward under high stress condition. Hereby, the triggering model（ nonlinear creep body） of accelerated creep according to the accumulative creep deformation of these bases, introduced the instantaneous plastic damage was introduced to describe the unstable creep characters. On component, combined with the hooker body and viscoelasto-plastic body, the nonlinear rheological model of rock was established between nonlinear rheological model and experimental curves tion of hardening coefficient of viscosity is necessary, and the is available and reasonable. to describe the overall process of creep. The comparison show that two curves accord well each other, the correcimproved nonlinear viscoelasto-plastic rheological modelis available and reasonable.
Keywords：viscoelasto-plastic rheological modelhardening coefficient of viscosityhardening-damage effectaccumu-lative creep deformation of damageinstantaneous plastic componentaccelerating creep body
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 936-943 )