沥青混凝土路面纵向裂缝发展影响因素初探

Finite Element Analysis of Longitudinal Crack of Asphalt Concrete Pavement

路面裂缝是长期困扰建设者的问题之一。针对沥青混凝土路面纵向裂缝的问题,建立路基路面结构的三维模型,运用三维有限元对其进行分析。根据数值分析的结果,得到路面与轮胎接触面下处于复杂应力状态,轮隙(并排两轮向的缝隙)中心点处于x,y方向受拉,z方向受压的应力状态,该状态可加剧纵向裂缝的发展。同时,沥青混凝土面层在荷载作用下的差异沉降也可导致和加速纵向裂缝的产生、发展及路面损坏。得出的结论为进一步研究纵向裂缝出现的原因、影响因素及发展规律等提供了基本依据。

Longitudinal crack widely exists in asphalt concrete pavement. A typical 3D model has been found. Based on finite element analysis of the model, the causes,which make for longitudinal crack of asphalt concrete pavement, are analyzed.The result shows that the roadsurface under the tire, especially the center of the tangency, is in a complex stress state.This state will accelerate longitudinal crack＇s deterioration. And, the different displacement of the layered asphalt concrete can effect longitudinal crack. At last, some preventing and cruing strategies are proposed according to the mechanism of longitudinal crak＇s propagation.