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Analysis and design of two layered flexible pavement systems: A new mechanistic approach

机译：两层柔性路面系统的分析和设计：一种新的机械方法

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Analysis of two layered flexible pavements is considered as a significant aspect for design of low volume roads, which typically consist of a thick granular base course directly laid over subgrade with or without a thin asphalt-wearing course. Permanent deformation or rutting has been observed to be the major distress mode in thin surfaced or unsurfaced low volume roads. In the present study, a new formulation has been proposed to determine the surface and interface deflections for both single and standard axle dual wheel assembly for a two layered pavement system. The present formulation has been developed based on mechanistic approach and the solutions obtained from 3-dimensional finite element program, using ABAQUS taking into account the influence of rectangular tire imprint, modulus of granular base course, pavement thickness and ratio of modulus of pavement and subgrade. The effect of Poisson's ratio of granular base and subgrade is observed to be very insignificant. For the estimation of surface and interface deflections, deflection factors have been generated in the form of non-dimensional charts as a function of ratio of modulus of pavement and subgrade, and ratio of pavement thickness and tire width.
机译：对两层柔性路面的分析被认为是设计小体积道路的重要方面，该道路通常由直接铺设在路基上的厚颗粒状基础层组成，有或没有薄层沥青路面。在薄路面或无路面的低流量道路上，永久变形或车辙是主要的困扰方式。在本研究中，提出了一种新的配方来确定两层路面系统的单轴和标准车轴双轮组件的表面和界面挠度。本配方是根据机械方法和从ABAQUS三维有限元程序获得的解决方案开发的，并考虑了矩形轮胎印痕，粒状基层模量，路面厚度以及路面与路基的模量比的影响。观察到泊松比对颗粒状基层和路基的影响很小。为了估计表面和界面的挠度，已经以无量纲图表的形式生成了挠度系数，该挠度系数是路面和路基模量比，路面厚度和轮胎宽度比的函数。

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