Quantitative Analysis of Unfrozen Water Content of Muddy Clay under Extremely Low Temperature Freezing Conditions
Publication: Cold Regions Engineering 2024: Sustainable and Resilient Engineering Solutions for Changing Cold Regions
ABSTRACT
Water sealing of shafts and repair of subway tunnels all use liquid nitrogen for rapid freezing to realize emergency rescue, due to the unfrozen water content in the soil at extremely low temperatures will significantly affect the rescue project safety, therefore, it is necessary to quantitatively study unfrozen water content in soil at extremely low temperature. In this paper, based on LF-NMR, the unfrozen water content of the muddy clay at extremely low temperatures was measured, and the three cutoff values of the four types of unfrozen water in artificially frozen were quantified. The surface relaxivity value of muddy clay was obtained for the first time by combining with the MIP test. Results show that the three T2 cutoff values for the classification of strongly bound water, weakly bound water, capillary water, and bulk water are 0.13, 0.56, and 2.58 ms, respectively, and the freezing characteristic curve of clay at extremely low temperatures can be divided into the rapid decline stage and the slow decline stage. The value of surface relaxivity of the muddy clay is 12 nm/ms. This study facilitates the stability analysis of artificially frozen projects by investigating the unfrozen water content of the soil under extremely low-temperature conditions.
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Cold Regions Engineering 2024: Sustainable and Resilient Engineering Solutions for Changing Cold Regions
Pages: 79 - 93
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Published online: May 9, 2024
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