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应赛, 夏晓舟, 文桃, 周凤玺, 曹亚鹏, 李国玉, 章青. 基于核磁共振技术的土体冻结特征曲线试验研究[J]. 岩土工程学报, 2024, 46(7): 1437-1444. DOI: 10.11779/CJGE20230301
引用本文: 应赛, 夏晓舟, 文桃, 周凤玺, 曹亚鹏, 李国玉, 章青. 基于核磁共振技术的土体冻结特征曲线试验研究[J]. 岩土工程学报, 2024, 46(7): 1437-1444. DOI: 10.11779/CJGE20230301
YING Sai, XIA Xiaozhou, WEN Tao, ZHOU Fengxi, CAO Yapeng, LI Guoyu, ZHANG Qing. Experimental study on freezing characteristic curve of soils based on nuclear magnetic resonance technology[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(7): 1437-1444. DOI: 10.11779/CJGE20230301
Citation: YING Sai, XIA Xiaozhou, WEN Tao, ZHOU Fengxi, CAO Yapeng, LI Guoyu, ZHANG Qing. Experimental study on freezing characteristic curve of soils based on nuclear magnetic resonance technology[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(7): 1437-1444. DOI: 10.11779/CJGE20230301

基于核磁共振技术的土体冻结特征曲线试验研究

Experimental study on freezing characteristic curve of soils based on nuclear magnetic resonance technology

  • 摘要: 冻结特征曲线描述了土中未冻水含量随温度变化的规律,给出适用不同土质的冻结特征曲线计算模型具有重要的工程价值。利用核磁共振技术对6种土体的冻结特征曲线进行了测试,给出了描述土体冻结特征曲线的Michalowski模型参数的确定方法,分析了初始含水率和土体性质对冻结特征曲线的影响,利用Michalowski模型参数的特征对模型进行了改进。研究表明,冻结特征曲线与初始含水率无关,冻结过程中不同初始含水率土体的冻结特征曲线相同。在不考虑温度影响时,模型参数wa近似等于土中最大结合水含量,可以作为分析和评价黏性土特性的重要指标参数。改进后的单参数Michalowski模型可实现对未冻水含量的良好预测,降低了模型的复杂性,提升了模型的实用价值,但模型的适用范围,有待验证。

     

    Abstract: The freezing characteristic curve describes the variation of unfrozen water content with temperature in soils, and it is of engineering value to provide a model for calculating freezing characteristic curves suitable for different soil types. The freezing characteristic curves of six kinds of soils are tested by using the nuclear magnetic resonance technology, and a method for determining parameters of Michalowski model describing the freezing characteristic curves of soils is given. The influences of the initial water content and soil properties on the freezing characteristic curve are analyzed, and the model is improved by using the characteristics of Michalowski model parameters. The study shows that the freezing characteristic curve is independent of the initial water content, and that of the soils with different initial water contents is the same during the freezing process. Without considering the influences of temperature, the model parameter wa is approximately equal to the maximum of bound water content in the soils, which can be used as an important index parameter to analyze and evaluate the characteristics of clay. The practical value is improved by the single-parameter Michalowski model as it performs well in predicting unfrozen water content with less model complexity, but the applicability of the model needs to be verified.

     

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