Analysis of Pore Structure and Thaw Settlement Characteristics of Frozen Silty Sand Based on Computer-Assisted Pulse Nuclear Magnetic Resonance

Computer-assisted pulse nuclear magnetic resonance (NMR) can be used to get important parameters for pore structure characteristics of porous materials. In order to fully understand the effect of frozen soil thaw settlement, the mechanism of artificially frozen soil thaw settlement was examined from...

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Bibliographic Details
Published in:Mathematical problems in engineering 2022-05, Vol.2022, p.1-8
Main Authors: Ma, Maoyan, Zhang, Biao, Peng, Shuguang
Format: Article
Language:English
Subjects:
Deformation
Engineering
Evolution
Experiments
Freeze-thaw
Frozen ground
Melting
NMR
Nuclear magnetic resonance
Phase transitions
Pore size distribution
Porosity
Porous materials
Sand
Soil porosity
Soil settlement
Soil testing
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Summary:Computer-assisted pulse nuclear magnetic resonance (NMR) can be used to get important parameters for pore structure characteristics of porous materials. In order to fully understand the effect of frozen soil thaw settlement, the mechanism of artificially frozen soil thaw settlement was examined from a microscopic perspective in conjunction with the frozen soil thaw settlement test. Additionally, to have a better understanding of how pore features change during the thaw settling process, the evolution of the pore size distribution in silty sand was studied. The findings demonstrate the porosity is obviously larger than the initial porosity after freeze-thaw, and the evolution of thaw settlement displacement is related to the change in porosity as thawing progresses, which grows exponentially with porosity. The fraction of medium and large pores (>0.1 μm) in the soil increases significantly during the thawing process. Accordingly, there is a slight increase in the proportion of pores (
ISSN:1024-123X
1563-5147
DOI:10.1155/2022/1249180