Experimental Research on Relationship between Resistivity and Moisture Content of Unsaturated Loess
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摘要: 通过土壤电阻率和土壤含水率的关系，可以将高密度电法测得的土壤电阻率剖面快速转化为含水率剖面，对于土壤含水率的连续性监测具有重要意义。笔者以甘肃永靖黑方台非饱和黄土为研究对象，采用四电极法进行了室内一维电阻率试验，分析了电阻率的时间特性，提高了黄土电阻率测试的精度，建立了黑方台黄土电阻率与其含水率之间的关系。结果表明，同一干密度条件下，在黄土吸湿和脱湿过程中，黄土的含水率与电阻率呈指数关系，脱湿和吸湿过程均具有较好的相关性，在含水率不断增加的过程中，土体的电阻率逐渐减小。在不同干密度条件下，黄土的电阻率和含水率具有较好的相关性，且随着含水率的增大，电阻率值逐渐减小直至趋于稳定，随着干密度的增大，土体对水分的敏感性有所降低。Abstract: Based on the relationship between soil resistivity and soil moisture content, the soil resistivity profile measured by high density electrical method can be quickly transformed into water content profile, which is of great significance for the continuous monitoring of soil moisture content. In this paper, the unsaturated loess in Heifangtai, Yongjing, Gansu Province is taken as the research object. The indoor one-dimensional resistivity test is carried out by four electrode method. The time characteristics of the resistivity are analyzed, the accuracy of the Loess resistivity test is improved, and the relationship between the resistivity and water content of the loess in Heifangtai is established. The results show that under the same dry density, in the process of moisture absorption and dehumidification, the moisture content and resistivity of loess show an exponential relationship, and both of them have a good correlation. In the process of increasing moisture content, the resistivity of soil decreases gradually. Under different dry density conditions, the resistivity and water content of loess have a good correlation, and with the increase of water content, the resistivity value gradually decreases until it tends to be stable. With the increase of dry density, the sensitivity of soil to water decreases.
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Keywords:
- soil moisture content /
- soil resistivity /
- moisture content monitoring /
- loess
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