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

机译:不饱和膨胀土不同方法源自不同方法的渗透性和扩散函数的比较

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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:膨胀路基土壤的渗透率和扩散函数是人行道设计中的关键参数。它们控制水分流入和排出土壤,从而使路基经历的运动量。已经提出了几种模型来估计来自土壤水特征曲线(SWCC)的两种功能以及饱和的渗透系数。然而,这些方法揭示了两种功能的确定差异。渗透系数也可以从SWCC的扩散系数和SWCC的斜率测量,或通过瞬时轮廓方法实验。在本文中,执行了在从最常用的SWCC模型,扩散性测试和瞬时配置文件中确定两个参数的比较研究。发现SWCC模型明显减少了比来自其他两种方法的测量值显着更少。然而,扩散性试验的结果表现出与瞬间剖面方法源于衍生的结果。

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