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Abstract The measured data from soil stressometer located in dam and achievements of previous researchers both showed that the stress path of rockfill during filling period is close to constant stress ratio state. This rule will not change because of the complicate material partition and construction stages. The stress path influences the deformation properties of rockfill in greater degree. The constitutive models and corresponding parameters obtained under the conventional triaxial experiments path may not play its role correctly for the real dam stress path. From the characters of stress-strain of Nuozhadu，Shuibuya and Sanbanxi rockfill materials，the and curves can be fitted with power function. Based on the Nanshui elastoplastic model with double yield surface(Shenzhujiang model)，an elastoplastic model with double yield surfaces in the p-q plane was established，which is suitable for constant stress ratio path. According to the direction of plastic strain increment，the reasonable shape of yield surface about under constant stress ratio path is investigated. Finally，taking the Nuozhadu dam main rockfill for case study，the model parameters are determined and the applicability of the model is analyzed primarily.
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Received: 16 April 2012
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2013, Vol. 32 
