Abstract
A creep model based on Kelvin–Voigt fractional-order derivative model (KVFD) with less parameters and clearer physical description is established to obtain viscous-elastic property of frozen soil using spherical indentation tests (SITs), uniaxial creep tests and triaxial creep tests. Mechanical parameters identification principal (MPIP) is presented to verify fractional-order derivative Kelvin, Maxwell, Merchant and Burgers models have unique solution of mechanical parameters. MPIP is utilized to prove cascaded model of more than two fractional-order derivative Kelvin elements and Maxwell elements bring variable solutions of parameters in following conditions: (1) More than two cascaded fractional-order derivative Kelvin elements have same fractional-order and relaxation time; (2) More than two fractional-order derivative Maxwell elements are included in cascaded model. Experimental data of SITs reveal discrepancy of deformation curve also leads to diverse solutions of parameters and discrepancy of relaxation modulus. Discrepancy of relaxation modulus decreases with the decrease in deformation discrepancy. Relaxation modulus predicted by the proposed model is closer to Hertz’s solution but higher than those given by Roman’s solution after 5 h of loading. Validation of test data in SITs, uniaxial and triaxial creep tests demonstrates that the proposed model agrees well with the available laboratory results of frozen sand.
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Acknowledgements
This research was supported by National Natural Science Foundation of China (41771078, 41871061), the Science and Technology Project of Yalong River Hydropower Development Company (LHKA-G201906), and the Cooperation and Exchange Project between NSFC and RFBR (42011530083).
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Zhang, Z., Huang, C., Jin, H. et al. A creep model for frozen soil based on the fractional Kelvin–Voigt's model. Acta Geotech. 17, 4377–4393 (2022). https://doi.org/10.1007/s11440-021-01390-8
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DOI: https://doi.org/10.1007/s11440-021-01390-8