| In construction of underground energy storage tank, there are much accompanying mudstone in the strata. As a soft rock, the mechanical properties of mudstone will adversely affect the stability of the underground energy storage tank The deformation and destruction-resisting ability of the rock material will be reduced and the normal use of the tank can't be ensured because of the high rheological property of the mudstone. But at present, the study of the rock mechanical properties are limited in mechanical experiment and analysis with constant parameters, so it can't accurately predict the time-dependent deformation of the underground energy storage tank.This paper summarized the non-stationary rheological theories, analyzed the the time-dependent deformation rule of existing creep experiments, combined the newly elastic-viscoplastic non-stationary rheological constitutive model, and further developed the ABAQUS computation program by theoretical deduction and numerical simulation. Though the numerical simulation of mudstone uniaxial and triaxiality creep experiment, analyzed the weaken phenomenon of mudstone, and the following conclusions can be drawn:1,From the comparison of the numerical simulation results with stationary and non-stationary parameters, it is verified that ABAQUS is reasonable in analysis the weaken phenomenon of the mudstone.2,From the comparison of the non-stationary parameters numerical simulation results with the uniaxial and triaxiality creep experiment results, it is proved that the results of the further developed ABAQUS computation program can reasonable simulate the weaken phenomenon of mudstone in the creep experiment.The conclusions of this paper can improve the existing non-stationary rheological theories, and have a large effect on accurately predict the time-dependent deformation of the underground energy storage tank and other large underground engineering projects.
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