Nonlinear creep constitutive model for artificially prepared site soil
HU Zai-qiang1, WANG Kai1,2, LI Hong-ru1, LIANG Zhi-chao1, JIAO Han-wei1, WU Peng1, CHEN Zhen-peng1
1. Institute of Geotechnical Engineering,Xi′an University of Technology,Xi′an 710048,China; 2. Xi′an Engineering Investiyation & Design Research Institute of China National Nonferrous Metals Industry Co. Ltd.,Xi′an 710054,China
Abstract：Through the triaxial creep tests, the influences of the mixing amount of glutinous rice slurry on the triaxial creep characteristics of artificially prepared relic soil are studied. The test results show that after adding a certain amount of glutinous rice slurry, the triaxial creep of the artificially prepared ruins soil is significantly reduced, and the stable time increases. With the increase in the quality of the glutinous rice slurry, the creep value of the artificially prepared ruins soil shows a trend of first decreasing and then increasing. When the mass ratio of soil to glutinous rice slurry is 90:10, the creep value reaches the minimum. The triaxial creep of artificially prepared relic soil has obvious nonlinearity, and the nonlinearity becomes stronger with time. The total deformation is decomposed into linear viscoelastic deformation, linear viscoplastic deformation and nonlinear viscoplastic deformation. The linear strain part is described by the model theory, and the nonlinear part adopts empirical formulas to establish the nonlinear, semi-empirical and semi-theoretical viscoelastic-plastic creep constitutive model, suitable for artificial preparation of site soil. This model can better describe the triaxial creep characteristics of artificially prepared site soils. This nonlinear creep model is based on the element model. The empirical formula is a nonlinear correction of the theoretical model and has high applicability.
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