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Effects of water content and salt content on electrical resistivity of loess
Environmental Earth Sciences ( IF 2.8 ) Pub Date : 2021-07-08 , DOI: 10.1007/s12665-021-09769-2
Zhao Duan 1, 2 , Xusheng Yan 1, 2 , Qiang Sun 1, 2 , Xuan Tan 1, 2 , Chenxi Dong 1, 2
Affiliation  

As a special soil widely existing in world, loess engineering properties are often disturbed by water and salt. Hence, the influence of water content and salt content on the conductivity properties of loess was analyzed using the electrical resistivity of loess obtained by LCR digital bridge tester in this study. Loess electrical resistivity with different water content (8–20%) and NaCl content (0–6%) was obtained at test frequencies of 100 Hz, 1 kHz, and 10 kHz. Results show that loess electrical resistivity exhibited an exponential function with a change in water content. As water content increased, loess electrical resistivity decreased significantly. When water content exceeded the plastic limit, loess electrical resistivity decreased slowly. When NaCl content around 2%, the increase of ion content in conductive path of loess enhanced loess conductivity. When NaCl content reached 6%, the conductive capacity of the loess tended to reach its maximum, and the resistivity slowly decreased and stabilized. There was a nonlinear functional relation between loess electrical resistivity and test frequency. As the test frequency increased, the number of ions that could be used to form a conductive path increased, and loess electrical resistivity decreased. In addition, three paths model of loess electrical resistivity and double-layer structure can well explain above phenomena. This research can provide theoretical basis for electrical resistivity technology to predict water content and salt content, and valuable reference for large-scale field application of electrical resistivity observation technology.



中文翻译:

含水量和含盐量对黄土电阻率的影响

黄土作为世界上广泛存在的一种特殊土壤,其工程性质经常受到水和盐分的干扰。因此,本研究利用LCR数字桥梁测试仪测得的黄土电阻率,分析了含水量和盐分含量对黄土导电性能的影响。在 100 Hz、1 kHz 和 10 kHz 的测试频率下获得了不同含水量 (8-20%) 和 NaCl 含量 (0-6%) 的黄土电阻率。结果表明,黄土电阻率随含水量的变化呈指数函数。随着含水量的增加,黄土电阻率显着下降。当含水量超过塑限时,黄土电阻率缓慢下降。当NaCl含量在2%左右时,黄土导电路径中离子含量的增加提高了黄土的导电性。当NaCl含量达到6%时,黄土的导电能力趋于达到最大值,电阻率缓慢下降并趋于稳定。黄土电阻率与测试频率之间存在非线性函数关系。随着测试频率的增加,可用于形成导电路径的离子数量增加,而黄土电阻率降低。此外,黄土电阻率和双层结构的三路径模型可以很好地解释上述现象。该研究可为电阻率技术预测含水量和含盐量提供理论依据,为电阻率观测技术的大规模现场应用提供有价值的参考。当NaCl含量达到6%时,黄土的导电能力趋于达到最大值,电阻率缓慢下降并趋于稳定。黄土电阻率与测试频率之间存在非线性函数关系。随着测试频率的增加,可用于形成导电路径的离子数量增加,而黄土电阻率降低。此外,黄土电阻率和双层结构的三路径模型可以很好地解释上述现象。该研究可为电阻率技术预测含水量和含盐量提供理论依据,为电阻率观测技术的大规模现场应用提供有价值的参考。当NaCl含量达到6%时,黄土的导电能力趋于达到最大值,电阻率缓慢下降并趋于稳定。黄土电阻率与测试频率之间存在非线性函数关系。随着测试频率的增加,可用于形成导电路径的离子数量增加,而黄土电阻率降低。此外,黄土电阻率和双层结构的三路径模型可以很好地解释上述现象。该研究可为电阻率技术预测含水量和含盐量提供理论依据,为电阻率观测技术的大规模现场应用提供有价值的参考。电阻率缓慢下降并趋于稳定。黄土电阻率与测试频率之间存在非线性函数关系。随着测试频率的增加,可用于形成导电路径的离子数量增加,而黄土电阻率降低。此外,黄土电阻率和双层结构的三路径模型可以很好地解释上述现象。该研究可为电阻率技术预测含水量和含盐量提供理论依据,为电阻率观测技术的大规模现场应用提供有价值的参考。电阻率缓慢下降并趋于稳定。黄土电阻率与测试频率之间存在非线性函数关系。随着测试频率的增加,可用于形成导电路径的离子数量增加,而黄土电阻率降低。此外,黄土电阻率和双层结构的三路径模型可以很好地解释上述现象。该研究可为电阻率技术预测含水量和含盐量提供理论依据,为电阻率观测技术的大规模现场应用提供有价值的参考。可用于形成导电路径的离子数量增加,黄土电阻率下降。此外,黄土电阻率和双层结构的三路径模型可以很好地解释上述现象。该研究可为电阻率技术预测含水量和含盐量提供理论依据,为电阻率观测技术的大规模现场应用提供有价值的参考。可用于形成导电路径的离子数量增加,黄土电阻率下降。此外,黄土电阻率和双层结构的三路径模型可以很好地解释上述现象。该研究可为电阻率技术预测含水量和含盐量提供理论依据,为电阻率观测技术的大规模现场应用提供有价值的参考。

更新日期:2021-07-08
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