沥青混凝土路面结构组合力学分析

沥青混凝土路面面层厚度和基层模量是路面结构设计中的重要参数。采用3种典型路面结构,分析基层模量变化时的面层最大剪应力和层底弯拉应变的变化趋势。结果表明,增加沥青混凝土层厚度和增大基层模量能减小层底弯拉应变,有利于获得更长的结构疲劳寿命。同时,基层模量增大使面层剪应力增大。为此,在原有的层底弯拉应变和基顶压应变指标的基础上,提出增加抗剪指标以控制基层模量在合理范围内,防止出现过早的局部损坏。最后,提出了长寿命沥青混凝土路面组合设计的建议。

Mechanistic Analysis of Structural Combination of Asphalt Concrete Pavements

Surface course thickness and base modulus of asphalt concrete pavements are important pa-rameters in pavement structure design. Three typical pavement structures are used to analyze the maxi-mum shear stress of surface course and the flexure tensile strain response as the base modulus changes.Results indicate that the flexure tensile strain decreases as asphalt course thickness and base modulus in-crease. At the same time, an increase in base modulus makes asphalt course shear stress to increase.Therefore on the basis of indexes of flexure tensile strain and vertical compressive strain,it is put forwardto increase the shear index to control the base modulus within a reasonable range and to prevent early fail-ures.Last, the advices are advanced to design the structural combination of perpetual pavements.