Study on the relationship between unfrozen water content and electrical conductivity in frozen soils

被引：0
|
作者：
Luo H. [1 ]
Teng J. [1 ,2 ]
Zhang S. [1 ,2 ]
Sheng D. [1 ,2 ]
机构：
[1] Department of Geotechnical Engineering, Central South University, Changsha
[2] National Engineering Laboratory for High-Speed-Railway Construction, Central South University, Changsha
来源：
Teng, Jidong (jdteng@csu.edu.cn) | 2021年 / Biodiversity Research Center, Academia Sinica卷 / 40期
基金：
中国国家自然科学基金;
关键词：
Bulk conductivity; Cation exchange capacity; Electrical double layer; Soil mechanics; Surface conductivity; Unsaturated frozen soil;
D O I：
10.13722/j.cnki.jrme.2020.0718
中图分类号：
学科分类号：
摘要：
The determination method of unfrozen water content and ice content in frozen soils is one of the critical issues in cold region geotechnical engineering. This study performs a series of laboratory tests to investigate the electrical conductivity of frozen soils. The relationships among the electrical conductivity of frozen soils, the unfrozen water content and the temperature are revealed. The testing results show that the relationship between the conductivity and the temperature at positive temperature cannot be directly applied to negative temperature, and that the traditional simple methods which do not distinguish the electrical conductivity at positive and negative temperature zones will result in a considerable error. Based on the soil conductivity theory, an electrical conductivity model which can be applied at both positive and negative temperature zones is established to predict the unfrozen water content. Based on the analysis of the changing law of the bulk conductivity and the surface conductivity, it is found that the bulk conductivity can be ignored for the frozen soil. The developed simplified conductivity model is then validated by the tested results and the existing method in the literature, showing that the new model has a good agreement with the measured data. © 2021, Science Press. All right reserved.
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页码：1068 / 1079
页数：11
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