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Comparison between the Permeability and Diffusivity Function Derived from Different Methods of Unsaturated Expansive Soils

机译:不同方法对非饱和膨胀土的渗透率与扩散率函数的比较

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Permeability and diffusivity function of expansive subgrade soils are critical parameters in the design of pavements. They govern the moisture flow in and out of the soil and thus the amount of movement the subgrade experiences. Several models have been proposed to estimate the both functions from the soil water characteristic curve (SWCC) and the saturated coefficient of permeability. However, these methods reveal a noticeable difference in the determination of both functions. The permeability coefficient can also be measured from the diffusion coefficient and the slope of the SWCC, or experimentally by the instantaneous profile method. In this paper, a comparison study in the determination of both parameters from the most frequently used SWCC models, diffusivity test, and instantaneous profile method is carried out. It is found that SWCC models reveal significantly less measurements than those derived from the other two methods. However, the results from the diffusivity test manifest good agreement with those derived from the instantaneous profile method.
机译:膨胀路基土的渗透率和扩散率函数是路面设计中的关键参数。它们控制水分流入和流出土壤的方式,从而控制路基所经历的运动量。已经提出了几种模型来从土壤水分特征曲线(SWCC)和饱和渗透系数来估计这两个函数。但是,这些方法在两种功能的确定上都显示出明显的差异。渗透系数也可以根据SWCC的扩散系数和斜率来测量,或者通过瞬时分布法通过实验来测量。在本文中,对从最常用的SWCC模型确定两个参数,扩散率测试和瞬时轮廓法进行了比较研究。结果发现,SWCC模型比其他两种方法得出的测量结果要少得多。但是,扩散测试的结果与瞬时轮廓法得出的结果非常吻合。

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