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| Experimental study on constitutive model of structural Q3 loess based on disturbed state concept |
| SHAO Shuai，CHU Feng，SHAO Shengjun |
| (Research Institute of Geotechnical Engineering，Xi?an University of Technology，Xi?an，Shaanxi 710048，China) |
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Abstract Q3 loess is widely distributed in Northwest China and is markedly structural. In order to describe the stress-strain relationship of structural loess，a constitutive model of Q3 loess based on disturbed state concept(DSC) theory was put forward. The relationships of stress and deformation between Q3 loess and normal consolidation soil were incorporated in the constitutive model. New disturbance factors reflecting the influence of spherical and shear stress were used. The disturbance factors include the volumetric strain disturbance factor(Dv) and shear strain disturbance factor(Ds). The disturbed function based on theory and experiment was established. The disturbed function makes the constitutive model to accord with the actual stress path of soil. The physical meaning of the parameters of the constitutive model is clear. The model parameters are obtained from the isotropic test and triaxial shear test. Experimental results proved that the constitutive model described the deformation characteristics of Q3 loess reasonably.
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2016, Vol. 35 
