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Dynamic Hydraulic Conductivity (Permeability) of Asphalt Pavements

机译：沥青路面的动态水力传导率（渗透性）

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摘要

External pressures applied to a saturated pavement pore structure are often dynamic due to the repeated tire loading. Therefore, a dynamic permeability constant is more realistic representation of the response of a pavement pore structure than the Darcy’s permeability. To investigate the unsteady (dynamic) fluid flow in asphalt pavements, a 3D fluid flow model was developed using the lattice Boltzmann (LB) method. The model was validated using the wellknown closed form solution of oscillating flow through a circular tube. A number of simulations were carried out to calculate the dynamic permeabilities of different asphalt specimens exposed to pulsatile pressures. It was shown that the dynamic permeability of an asphalt pore structure collapse on a single curve for a given frequency, confirming its universal behavior.
机译：由于轮胎反复加载，施加到饱和路面孔隙结构上的外部压力通常是动态的。因此，与达西的渗透率相比，动态渗透率常数更能真实地表示路面孔隙结构的响应。为了研究沥青路面中的非稳态（动态）流体流动，使用格子Boltzmann（LB）方法开发了3D流体模型。使用众所周知的通过圆管的振荡流的封闭形式解决方案对模型进行了验证。进行了许多模拟，以计算暴露在脉动压力下的不同沥青试样的动态渗透率。结果表明，在给定的频率下，沥青孔隙结构的动态渗透率在一条曲线上坍塌，证实了其普遍的行为。

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