Identification of Creep Model and Parameters Inverse Analysis for Nanning Expansive Soils

Abstract:

A series of loading - unloading consolidation creep experiments had been carried out on Nanning unsaturated expansive soils. Lots of loading - unloading creep curves under different stress levels were obtained. Through the various stages of creep deformation analyzed, it was concluded that the creep deformation of expansive soil contained elastic deformation, viscoelastic deformation and plastic deformation of components. Then model components in constitutive model of expansive soils were discussed. The rheological model of the seven components was proposed, which can describe unsaturated expansive soil elastic - viscous - plastic behavior. According to the experimental datum, all parameters of this model under different stresses were determined by the inverse analysis method. It is showed that the values of numerical calculated using this model agree well with those obtained by the creep tests. The conclusions provide a reliable theoretical basis for the rheological model of expansive soils to further study.

• Periodical: Advanced Materials Research (Volumes 639-640)
• Pages: 657-664
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.639-640.657
• Online since: January 2013
• Authors: Hong Bin Xiao, Cong He, Zhen Yu Li, Guo Xiao
• Keywords: Creep Deformation, Expansive Soil, Model Component, Rheological Behavior

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