Impact dynamic mechanical properties of frozen soil with freeze-thaw cycles

LI Bin; ZHU Zhiwu; LI Tao

doi:10.11883/bzycj-2021-0475

Volume 42 Issue 9

Sep. 2022

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LI Bin, ZHU Zhiwu, LI Tao. Impact dynamic mechanical properties of frozen soil with freeze-thaw cycles[J]. Explosion And Shock Waves, 2022, 42(9): 091411. doi: 10.11883/bzycj-2021-0475

Citation:

LI Bin, ZHU Zhiwu, LI Tao. Impact dynamic mechanical properties of frozen soil with freeze-thaw cycles[J]. Explosion And Shock Waves, 2022, 42(9): 091411. doi: 10.11883/bzycj-2021-0475

LI Bin, ZHU Zhiwu, LI Tao. Impact dynamic mechanical properties of frozen soil with freeze-thaw cycles[J]. Explosion And Shock Waves, 2022, 42(9): 091411. doi: 10.11883/bzycj-2021-0475

Citation:

LI Bin, ZHU Zhiwu, LI Tao. Impact dynamic mechanical properties of frozen soil with freeze-thaw cycles[J]. Explosion And Shock Waves, 2022, 42(9): 091411. doi: 10.11883/bzycj-2021-0475

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Impact dynamic mechanical properties of frozen soil with freeze-thaw cycles

doi: 10.11883/bzycj-2021-0475

LI Bin^1
,,
ZHU Zhiwu^{1, 2
,
,},
LI Tao¹

1.
Applied Mechanics and Structural Safety Key Laboratory of Sichuan Province, School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
2.
State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences, Lanzhou 730000, Gansu, China

Received Date: 2021-11-15
Rev Recd Date: 2022-04-25

Available Online: 2022-05-18

Publish Date: 2022-09-29

Abstract

Abstract

During engineering construction and service in seasonally frozen soil regions, frozen soil is often subjected to the combined action of freeze-thaw (F-T) cycles and impact loading, which changes its physical state and mechanical properties. In order to explore the effect of F-T cycles on the impact dynamic mechanical properties of frozen soil, in this paper, the typical frozen soil was taken as the research object, and the effect of F-T cycles on the impact dynamic mechanical properties of frozen soil was comprehensively studied with the help of high and low temperature F-T cycles experimental equipment and a split Hopkinson pressure bar device, through F-T cycles experiments with different F-T cycles numbers, freezing experiments at different temperatures, and impact dynamic experiments with different strain rates. The results shows that there is an F-T cycles effect in frozen soil. With the increase of the number of F-T cycles, the peak stress of frozen soil decreases to a certain extent, but after reaching the critical number of F-T cycles, the peak stress remains stable. According to the hydrostatic pressure theory, it is believed that the F-T cycles mainly changes the mechanical properties of frozen soil by changing its microstructural characteristics. Meanwhile, the frozen soil also exhibits obvious strain rate effect and temperature effect, and its peak stress increases with the increase of strain rate or the decrease of temperature. The F-T damage factor was defined by the peak stress, and the impact damage was deduced by a statistical method that it assumes the microstructure strength of frozen soil satisfies the Weibull distribution, a damage viscoelastic constitutive model based on the Z-W-T equation was proposed. The model can better describe the impact dynamic mechanical behavior of frozen soil after F-T cycles and provide reference for the impact dynamic damage of frozen soil in seasonally frozen soil regions.
- frozen soil,
- freeze-thaw cycle,
- impact,
- damage,
- constitutive model

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References(41)

References

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