Modeling the combined effect of time and temperature on normally consolidated and overconsolidated clays
- Resource Type
- Authors
- Yang-Ping Yao; Jilin Qi; Lingming Kong
- Source
- Acta Geotechnica. 15:2451-2471
- Subject
- 010102 general mathematics
Constitutive equation
0211 other engineering and technologies
Preconsolidation pressure
02 engineering and technology
Strain rate
Geotechnical Engineering and Engineering Geology
01 natural sciences
Solid mechanics
Earth and Planetary Sciences (miscellaneous)
Hardening (metallurgy)
Geotechnical engineering
0101 mathematics
Time variable
Geology
021101 geological & geomatics engineering
- Language
- ISSN
- 1861-1133
1861-1125
Clay is under the coupling influence of both time and temperature in some innovative geomechanical problems. Previous experimental researches have confirmed that time and temperature affect the overconsolidation degree of clay and induce overconsolidated characteristics. However, the experimental findings have not been included in constitutive models so far. This paper presents an innovative thermo-viscoplastic constitutive model based on the unified hardening model for overconsolidated clay. The new model combines the effect of time and temperature on overconsolidation by incorporating a temperature variable and a time variable into the hardening law and simultaneously considers the overconsolidated characteristics of clay by using the unified hardening parameter. The simulated results for laboratory tests show that the proposed model can not only reflect the influence of temperature and strain rate on the preconsolidation pressure, the undrained shear strength and the flow rule, but also describe the failure after undrained heating and creeping.