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摘要
Started with the time-dependence of the viscosity coefficient, 2 non-stationary viscous bodies named NN1 body and NN3 body respectively are introduced in this paper. Where, NN1 body describes the nonlinear increasing process of the viscosity coefficient of salt rock at primary creep stage, while NN3 body depicts the nonlinear decreasing process of the viscosity coefficient of salt rock at accelerated creek stage. After the combination of these 2 non-stationary viscous bodies and the basic components, a new 6-component non-stationary viscoelasto-plastic 'creep model which can reflect the whole creep process of salt rock is constructed. Then, the influence rule of the new parameters m and n on the creep curve of the non-stationary model is unveiled through sensitivity analysis: the larger the in is, the shorter the duration time of the primary creep stage will be and the larger the initial creep rate will be; the larger the n is, the more obvious the acceleration feature of creep curve will be and the quicker the rock failure will be. At last, the reasonableness of the non-stationary model is verified using the creep test data of salt rock, and the result indicates that the non-stationary model can precisely describe the three stages of the whole creep process of salt rock; whether the accelerated creep occurs or not, the fitting curves of the non-stationary model can tally well with the test data; and under the circumstance that the accelerated creep does not occur, even if relatively fewer test data are used to inverse the creep parameters, the non-stationary model can also precisely predict the long-term creep deformation of the salt rock.
