Viscoelastic–plastic constitutive model with damage of frozen soil under impact loading and freeze–thaw loading

• Published in: International journal of mechanical sciences 2022-01, Vol.214, p.106890, Article 106890
• Main Authors: Li, Bin, Zhu, Zhiwu, Ning, Jianguo, Li, Tao, Zhou, Zhiwei
• Format: Article
• Language: English
• Subjects: Damage; Freeze–thaw loading; Frozen soil; Impact; Viscoelastic–plastic constitutive model
• ISSN: 0020-7403; 1879-2162
• DOI: 10.1016/j.ijmecsci.2021.106890

•Experiments on frozen soil under impact and freeze-thaw loading were conducted.•The influence and mechanism of freeze-thaw loading on frozen soil was discussed.•The damage of frozen soil under freeze-thaw loading was analyzed.•A viscoelastic-plastic constitutive model with damage was established for frozen soil.Abstract This study aims to provide an understanding of the damage evolution and dynamic mechanical behavior of frozen soil under freeze–thaw (F-T) loading and impact loading. We used the split Hopkinson pressure bar (SHPB) device to evaluate the dynamic mechanical properties of frozen soil at different numbers and temperatures of F-T cycles. Our results indicate that the F-T process has a strong influence on the dynamic mechanical behavior of frozen soil. The peak stress of the frozen soil gradually weakens with an increase in the number of F-T cycles until the cycle number reaches the critical value for the steady state of the soil specimen (approximately 3–7 cycles). We observed a decrease in the peak stress of the frozen soil with a decrease in freezing temperature. We defined the F-T damage using wave impedance, which characterizes the microstructural properties of frozen soil, coupled it with the impact damage that satisfies the two–parameter Weibull distribution, and obtained the total damage of the frozen soil under F-T loading and impact loading. By combining the discretized Zhu–Wang–Tang (ZWT) model with the plastic theory that satisfies the Drucker–Prager (D-P) yield criterion, which is based on the improved hardening criterion with strain rate terms, we constructed a viscoelastic–plastic constitutive model with damage in frozen soil under F-T loading and impact loading. The results predicted by this model agree with the experimental data, validating its feasibility. [Display omitted] This study aims to provide an understanding of the damage evolution and dynamic mechanical behavior of frozen soil under freezethaw (F-T) loading and impact loading.We used the split Hopkinson pressure bar (SHPB) device to evaluate the dynamic mechanical properties of frozen soil at different numbers and temperatures of F-T cycles. Our results indicate that the F-T process has a strong influence on the dynamic mechanical behavior of frozen soil. The peak stress of the frozen soil gradually weakens with an increase in the number of F-T cycles until the cycle number reaches the critical value for the steady state of the soil specimen (approximately 37 cycles)