冻土未冻水含量与电导率的关系研究

doi:10.13722/j.cnki.jrme.2020.0718

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摘要冻土中未冻水与冰含量的确定是困扰寒区岩土工程研究的难题之一。通过对冻土的电导率进行测试，研究冻土电导率对含水率和温度的响应规律。试验结果表明，正温下电导率与温度的关系不能直接应用于负温条件，传统简单等效的方法会导致较大误差。基于冻土的导电理论建立冻土未冻水含量的电导率模型，实现了土体电导率模型在正温和负温区间的统一。分析孔隙电导率和表面电导率对总电导率的影响规律，论述了在冻结过程中可在误差允许范围内忽略孔隙电导率部分。并结合土体的冻结特征曲线数据，对简化的电导率模型进行试验验证，结果表明提出的模型与测试数据具有很好的吻合度，新模型简洁、有效。

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	罗豪良1
	滕继东1
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	张升1
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	盛岱超1
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关键词 ：土力学, 非饱和土, 孔隙电导率, 表面电导率, 双电层, 阳离子交换量

Abstract：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.

Key words： soil mechanics unsaturated frozen soil bulk conductivity surface conductivity electrical double layer cation exchange capacity

引用本文:

罗豪良1，滕继东1，2，张升1，2，盛岱超1，2. 冻土未冻水含量与电导率的关系研究[J]. 岩石力学与工程学报, 2021, 40(5): 1068-1079.
LUO Haoliang1，TENG Jidong1，2，ZHANG Sheng1，2，SHENG Daichao1，2. Study on the relationship between unfrozen water content and electrical conductivity in frozen soils. , 2021, 40(5): 1068-1079.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0718 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I5/1068

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