›› 2015, Vol. 36 ›› Issue (6): 1566-1572.doi: 10.16285/j.rsm.2015.06.006

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of unfrozen water content of frozen soils by low-field nuclear magnetic resonance

TAN Long1，WEI Chang-fu1, 2，TIAN Hui-hui2，ZHOU Jia-zuo2，WEI Hou-zhen2   

  1. 1. College of Civil Engineering and Architecture, Guilin University of Technology, Guilin, Guangxi 541004, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
  • Received:2014-02-11 Online:2015-06-11 Published:2018-06-14

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Abstract: Unfrozen water contents of saturated soil with different soil types and different concentrations of NaCl are measured by low-field nuclear magnetic resonance (NMR) in freezing-thawing cycles. The distribution of unfrozen water in soil is discussed combining with T2 distribution curve from the microscopic viewpoint during freezing and thawing process. It is concluded from the experimental results that the freezing process can be divided into three stages: super-cooling stage, rapid decline stage and stable stage; while the thawing process can only be divided into two stages: stable stage and rapid melting stage, and there is no overheating phenomenon in thawing process. During the freezing process, water in large pore freezes firstly. In a sharp contrast, the pore ice in small pores melts firstly. Thermodynamic potential difference of pore water results in the sequence of phase change of pore water during the freezing-thawing process. In addition, the influence of soil type and ion concentration on unfrozen water and hysteresis during freezing-thawing process is analyzed and possible mechanisms for the hysteresis are discussed.

Key words: frozen soil, unfrozen water content, NMR, T2 distribution, hysteresis

CLC Number: 

  • TU 445
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