Experimental study on pore structure and freezing characteristics of graded soils based on NMR

LIU Qian-qian; CAI Guo-qing; HAN Bo-wen; QIN Yu-teng; LI Jian

doi:10.11779/CJGE2022S1032

Volume 44 Issue S1

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Chinese Journal of Geotechnical Engineering > 2022 > 44(S1): 178-182. > DOI: 10.11779/CJGE2022S1032

LIU Qian-qian, CAI Guo-qing, HAN Bo-wen, QIN Yu-teng, LI Jian. Experimental study on pore structure and freezing characteristics of graded soils based on NMR[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(S1): 178-182. DOI: 10.11779/CJGE2022S1032

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Experimental study on pore structure and freezing characteristics of graded soils based on NMR

LIU Qian-qian^{1, 2,},
CAI Guo-qing^{1, 2, ,},
HAN Bo-wen²,
QIN Yu-teng²,
LI Jian²

1.
Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
2.
School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing 100044, China

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Received Date: September 24, 2022
Available Online: February 06, 2023

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Abstract

Abstract

The freezing characteristics of pore water is the basis for studying the moisture and heat transfer and frost heave of frozen roadbeds. Based on the nuclear magnetic resonance (NMR) technology, the effects of the fine-grained soil type, the fine-grained soil content and the maximum particle size on the freezing characteristics of graded soils are analyzed. The results show that the pore structure of the graded soils is highly related to the fine-grained soil type and content, and the pore distribution of the soil samples gradually changes from single peak to bimodal one as the clay content decreases. The influences of the maximum particle size on SFCC of the graded soils are relatively small, and the type and content of the fine particles are the important factors to control the unfrozen water content. The freezing of pore water gradually develops from large pores to small ones, while it is the opposite during thawing, and there is an obvious hysteresis between the freezing and thawing processes. After a freeze-thaw cycle, the pore structure of the soils changes slightly, the small and medium pores decrease and the large pores increase.
- graded soil,
- nuclear magnetic resonance,
- freeze-thaw cycle,
- freezing characteristic curve,
- unfrozen water content,
- pore structure

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References

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