Analysis on Unfrozen Water Content of Mohe Permafrost Based on NMR Method

Abstract:

Unfrozen water content has an important influence on the physical and mechanical properties of frozen soil. Little research has been done on unfrozen water content of permafrost in the Northeast Region, China, so the experimental investigation was performed on Mohe permafrost (4 kinds of samples were taken from 4 kinds of undisturbed frozen soil) based on NMR method, and the relationship and between frozen temperatures (-1°C, -4°C, -7°C, -11°C, -14°C, -16°C) and unfrozen water content was obtained. The test results indicate that, Unfrozen water content decreased with the reduction of frozen temperature of permafrost and there was a power function relationship between unfrozen water content and frozen temperature. The unfrozen water content reduction of No.3 sample was the slowest, because it had the lowest water content and the least frost-heave and thawed amount. It also can be attained that ice content of Mohe permafrost became more and more, but bound water and free water content got less and less while frozen temperature fell continuously.

• Periodical: Advanced Materials Research (Volumes 881-883)
• Pages: 1185-1188
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.881-883.1185
• Online since: January 2014
• Authors: Hao Lin Yu*, Wei Wang, Yuan Shun Ma, Xue Yan Xu
• Keywords: Frozen Temperature, Mohe Permafrost, NMR, Unfrozen Water Content

References

[1] W. Kunio. Measurement of unfrozen water content and relative permittivity of frozen unsatur- ated soil using NMR and TDR. J. Cold Regions Science and Technology. Vol. 20(2009), p.34.

DOI: 10.1016/j.coldregions.2009.05.011

[2] K. Tomasz. A comprehensive method of determining the soil unfrozen water curves. Application of the term of convolution. J. Cold Regions Science and Technology. Vol. 14(2003), p.71.

DOI: 10.1016/s0165-232x(03)00007-7

[3] Q,Y. Ma. Strength and wave velocity test on artificially frozen. Science and Engineering. vol. 12(1998), p.256.

[4] J.H. Kolaian, Low P.F. Calorimetric determination of unfrozen water in montmorillonite pastes. Soil Science. Vol. 95(1963), p.376.

DOI: 10.1097/00010694-196306000-00002

[5] A.R. Tice, C.M. Burrous, D.M. Anderson. Phase Composition Measurements on Soil at Very High Water Contents by the Pulsed Nuclear Magnetic Resonance Technique. J. Moisture and Frost-Related Soil Properties. 1978, p.11.