沥青面层结构参数对倒装路面结构非线性响应分析

Analysis of Nonlinear Response of Asphalt Surface Structural Parameters on Inverted Pavement Structure

级配碎石过渡层能有效防止或减少半刚性基层反射裂缝,改善沥青路面排水条件,但级配碎石模量低,具有非线性应力应变特性,将其作为过渡层置于沥青面层与半刚性基层之间,会改变原路面结构应力状况。通过使用非线性路面设计程序,从沥青面层厚度、模量两个路面结构参数分析路表弯沉值、面层及半刚性基层层底拉应力、土基顶面压应变等控制指标。归纳总结沥青面层厚度以及回弹模量变化对路面各个结构层的拉、压、剪切等力学响应规律,对倒装结构组合设计具有重要的参考价值。

The graded aggregate transition layer can effectively prevent or reduce reflective cracks in the semi-rigid base course and improve the drainage conditions of asphalt road surface,but,graded aggregate has a low modulus and a nonlinear stress-strain behavior.If such graded aggregate is used as a transition layer between the asphalt surface layer and the semi-rigid base,it may change the stress of original pavement structure.By using pavement design software based on the nonlinear theory,surface deflection,tensile stress in underside of surface layer and semi-rigid base course,compressive strain on top of subgrade and other control indicators are analyzed from two structural parameters of thickness and modulus of asphalt surface layer.The law of mechanical response of the variation of thickness and modulus of resilience of asphalt pavement on the tensile,compressive and shear stress in various structural layers of road pavement is analyzed and summarized,providing important reference for the combined design of inverted pavement structures.