Study on creep damage model of soft rock under the influence of dynamic disturbance effect
The dynamic disturbance effect has a major effect on the stability and safety of subsurface geotechnical engineering and slope engineering.In order to account for the effects of dynamic disturbance on creep damage to soft rock,this research presents a novel synergistic damage calculation approach based on the evolution law of viscosity coefficient.In order to characterize the evolution law of creep damage and deformation of soft rock under the influence of dynamic disturbance effect,it accomplishes the quantified expression of the evolution of viscosity coefficient at each stage of creep damage.A one-dimensional creep damage model of soft rock was constructed using the element model approach,based on the unique evolution equation of viscosity coefficient in each stage of soft rock creep under the influence of synergistic damage effect and the enhanced Newtonian body element.Building a three-dimensional creep damage model of soft rock under the influence of the synergistic damage effect,the plastic flow rule was presented on this basis.The suggested one-dimensional and three-dimensional creep damage models were verified for accuracy using the Levenberg-Marquardt optimization algorithm,and the model parameters were set using the soft rock creep test results under the influence of the dynamic disturbance effect.The findings showed that the accelerated creep phase in particular,in the one-and three-dimensional creep damage models,may better represent the time-varying deformation of soft rock brought on by dynamic disturbance effects.The correctness and applicability of the suggested creep damage models were carefully evaluated and examined,and a sensitivity analysis of the important creep damage model parameters was also carried out.
rock mechanicsdynamic disturbancesynergistic damageconstitutive modelcreep damagevisco-elasticity plasticity
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