复合路面沥青面层最佳厚度

应用三维有限元分析技术,分析了沥青罩面层厚度对反射裂缝的影响,给出了单双反裂裂缝的分界罩面厚度,提出了最佳脱开宽度和最佳罩面厚度的概念。试验路观测结果不仅验证了力学分析结果,同时显示,双裂缝的宽度基本上等于沥青罩面层的厚度。综合力学分析和试验路观测结果,给出了复合路面沥青罩面层的最佳厚度,为工程应用提供参考。

Optimal Thickness of Asphalt Overlay on Existing Concrete Pavement

Reflection cracking is a big problem for asphalt overlays on existing concrete pavements.It is not economic to completely prevent reflective cracking from occurring only by increasing the thickness of asphalt overlay,and in fact that method is not practical.Therefore,it is necessary to study the optimal thickness of asphalt overlay.The paper analyzed the effect of thickness of asphalt overlay on reflective cracking utilizing the three-dimensional finite element.Based on the result of the mechanistic analysis,the boundary thickness between the single reflective cracking and couple reflective cracking was given,and the concepts of"optimal width of delamination"and "optimal thickness of asphalt overlay"were put forward.Furthermore,the width of couple reflective cracking was equal to the thickness of asphalt overlays.In consideration of the results of both mechanistic analysis and field tests,the optimal thickness of asphalt overlay was suggested.