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Abstract The constitutive model of rock mass remains one of the most fundamental theoretical problems in rock mechanics to be solved. Based on the experimental results of the fractured rocklike materials，the localized progressive damage model is built. In this model，the representative volume element(RVE) is divided into the elastic zone and localized shear band according to the failure process and failure mechanisms of the fractured rocklike materials. The deformation process of the localized shear band is divided into cohesion weakening and friction strengthening phases. So，the emphasis in establishing the model is placed on the failure essence of the fractured rocklike materials，that is to say，the phases of cohesion weakening and friction strengthening should be exerted in tandem，which is discovered by the experiment. Moreover，in this model the processes of cohesion weakening and friction strengthening are represented by the damage variable which is defined in virtue of the relative sliding displacement of the shear band that represents the characteristics of the progressive failure process of the RVE. Furthermore，the chain model in localized band and homogenization method are adopted to combine the meso characteristics with the macro mechanical properties in this localized progressive damage model. Finally，based on the experimental results of M. Yumlu and M. U. Ozbay，the localized progressive damage model is validated. The result calculated through the localized progressive damage model agrees well with the experimental result，which proves the model is right.
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Received: 20 September 2005
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