含级配碎石层的组合式基层沥青路面轴载换算方法研究

Axle Load Conversion Method Study on Combined Base Asphalt Pavement with Graded Gravel Layer

含级配碎石层的组合式基层沥青路面与半刚性基层沥青路面在结构组合和设计指标上都有较大区别,若再以弯沉和弯拉应力作为换算指标进行轴载换算,显然不合理。为此,建立基于沥青层层底拉应变、级配碎石层顶面剪应力、半刚性材料层层底拉应力的轴载换算方法,对该类型的路面设计具有指导意义。

The combined base asphalt pavement with graded gravel layer and semi-rigid base asphalt pavement have great difference in structure combination and design index.If the deflection and bending stress are used as conversion indexes,the axle load conversion is obviously unreasonable.Therefore,the axle load conversion method based on the tensile strain of asphalt layer,the top shear stress of graded aggregate and the bottom tensile stress of semirigid material,is of guiding significance for the design of this pavementtype.