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《Chinese Journal of Underground Space and Engineering》 2013-01
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Mechanical Model of Rock Nonlinear Creep Damage Based on Fractional Calculus

Song Yongjun 1,2,Lei Shengyou 1(1.School of Highway,Chang'an University,Xi'an 710064,China;2.Department of Engineering Technology,Xijing University,Xi'an 710123,China)  
By means of classic element combination modeling,a new mechanical model of nonlinear creep damage is put forward containing component of fractional calculus and a damage variable for reflecting stress level and times,it also gives the constitutive and creep equations of the model.In lower stress level,the model can be effectively used to describe the rock characteristics,such as the attenuation creep and stabilization creep,moreover,if the stress level beyond the long-term strength of rocks,it can be used to reflect the accelerated creep characteristics.Comparison between the results obtained from the creep damage model and the creep test data shows that this model is not only able to describe the attenuation creep phase,the stabilization creep phase and the speed-up creep phase of the creep curve,but also to reduce the number of parameter in the creep model under the condition that the fitting precision is guaranteed.It provides a new idea for nonlinear creep model research.
【Fund】: 陕西省交通科技项目(06-01K)
【CateGory Index】: TU452
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