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Soil Water Characteristic Curves from Measures of Electrical Permittivity

机译：从介电常数测量的土壤水分特征曲线

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As the need for infrastructure increases, so must the understanding of soils under insitu or natural conditions. Soils in insitu conditions typically exist in an unsaturated state. Unsaturated soils exhibit different engineering behavior and responses than saturated soils. Therefore, methods must be developed to predict the behavior of unsaturated soils under insitu conditions. The soil water characteristic curve relates moisture content to matric suction of a soil for a given soil structure and is the primary means used to describe behavior and characteristics of unsaturated soils. Electrical parameters such as electrical permittivity have been used successfully to predict moisture content in soils. However, further research is required to assess if electrical parameters relate to soil suction and thus can become an alternative means to establish the soil water characteristic curve. In this study, correlations were investigated between soil water characteristic curve parameters and measures of electricalvpermittivity. The permittivity values were analyzed with respect to their variations with matric suction, volumetric water content, and dry unit weight. This study found that both volumetric water content and matric suction can be expressed as a function of the electrical permittivity; thus providing a possible means of determining an insitu soil water characteristic curve.
机译：随着对基础设施的需求增加，对原位或自然条件下的土壤的了解也必须增加。原位土壤通常以不饱和状态存在。与饱和土相比，非饱和土表现出不同的工程行为和响应。因此，必须开发方法来预测非饱和土壤在原位条件下的行为。对于给定的土壤结构，土壤水分特征曲线将水分含量与土壤的基质吸力相关，是描述非饱和土壤的行为和特征的主要手段。诸如介电常数的电参数已成功用于预测土壤中的水分含量。但是，需要进一步的研究来评估电参数是否与土壤吸力有关，因此可以成为建立土壤水分特征曲线的替代方法。在这项研究中，研究了土壤水分特征曲线参数与电导率测量之间的相关性。分析了介电常数值随基质吸力，体积水含量和干燥单位重量的变化。这项研究发现，体积水含量和基质吸力都可以表示为介电常数的函数。从而为确定土壤原位水特征曲线提供了一种可能的手段。

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