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A new method of developing elastic-plastic-viscous constitutive model for clays

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A new method is presented to develop the existing elastic-plastic constitutive model into an elastic-plastic-viscous one for clays. The actual loading process is divided into an instant process and a delayed process denoting the elastic-plastic strain and viscous strain, respectively. The elastic-plastic strain is determined by either an elastic-plastic model for overconsolidated clays or an improved model based on the elastic-plastic model for normally consolidated clays. In order to calculate viscous strain, a reference state line is defined based on the actual loading path. Combining the reference state line, an existing elastic-plastic model can be conveniently developed into an elastic-plastic-viscous model. Furthermore, using the proposed method, the modified cam clay model is extended into an elastic-plastic-viscous model. Comparisons with test results demonstrate that the extended model can capture the main time-dependent behaviours of clays, including creep, stress relaxation and strain rate effects.

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Correspondence to XiuLi Du.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51522802, 51778026, 51421005 & 51538001) and the Natural Science Foundation of Beijing (Grant No. 8161001).

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Lu, D., Miao, J., Du, X. et al. A new method of developing elastic-plastic-viscous constitutive model for clays. Sci. China Technol. Sci. 63, 303–318 (2020). https://doi.org/10.1007/s11431-018-9469-9

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  • clays
  • constitutive model
  • reference state line
  • time-dependent behaviours
  • creep
  • strain rate