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《Chinese Journal of Rock Mechanics and Engineering》 2007-S2
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A DAMAGE CONSTITUTIVE MODEL FOR SANDY SOIL BASED ON ANALYSIS OF GRAIN SLIDING

XU Hui,WANG Jingtao,WEI Jun (School of Civil Engineering and Mechanics,Huazhong University of Science and Technology,Wuhan,Hubei 430074,China)  
The experimental results reveal that the deformation of sandy soil has the characteristics as follows:nonlinear elastoplastic deformation,shear dilation and relativity of stress path. It is deemed that the sliding of grains in sand will contribute to these deformation characteristics. The contact among grains can be classified as perfect contact and sliding contact. When the shear stress reaches to the shear strength on the interfaces of grains,the contact will be transformed from perfect contact to sliding contact. The conversion of the contact among grains is regarded as damage in the sand skeleton. Two direction-region values of the sliding interfaces can be calculated:the one expressed as θ sis used to describe the direction region in the damage phase and the other one expressed as θ fis used to describe the direction region when the sand skeleton is subjected to failure. The ratio of θ sto θ fis defined as damage ratio and a damage constitutive model is proposed. The model properties can be determined through conventional triaxial compression test and constant stress ratio consolidation test. The model is capable of predicting deformation behaviors for various conditions,including varying hydrostatic stresses,consolidation conditions and stress paths. The achieved test results on the versatility of the proposed model indicate that the proposed model can rationally describe the deformation characteristics of sand.
【CateGory Index】: TU441.4
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