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Abstract Common method of describing the rheological damage is usually limited to the accelerated rheological stage，and damage in the decay and steady rheological stages are not considered，which contradict lots of experimental results. In order to better describe three stages of rock rheology，a rheological damage constitutive model for sandstone is proposed by using the damage theory and by introducing the concept of the whole process of damage into Burgers rheological model based on the Mazars damage evolution law. The validity of the model is verified and the parameters are determined by fitting the triaxial rheological test data. Then，the model is applied to the Phoenix Mountain Tunnel project by using the fast lagrangian analysis of continua in three- dimention(FLAC3D). The field monitoring data are compared to the model prediction using the proposed rheological damage model and the rheological model without damage. Results show that the numerical prediction using the proposed model agrees well with the field measurements and describes well the damage and rheological properties of surrounding rocks of the tunnel. Accordingly，the rheological damage model considering the whole process of damage is reasonable.
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Received: 12 April 2012
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2012, Vol. 31 
