旧水泥混凝土路面沥青加铺层力学分析

Mechanics Analysis of Asphalt Concrete Overlay on the Existing Cement Concrete Pavement

车辆荷载作用所引起的剪切破坏是旧混凝土路面上沥青加铺层 ( AC)结构产生反射裂缝的主要原因之一 ,采用有限元法对旧混凝土路面上 AC层进行了力学分析 ,重点考察了车辆荷载作用下接缝处 AC层的剪应力与弯沉差 ,分析了临界荷位及计算参数的影响规律 ,并给出了可用于生产设计的回归公式。

Reflection cracking resulted from shearing stress induced by vehicle loads is one of the conventional damage in asphalt concrete (AC) overlay on the existing cement concrete pavement. The finite element method is utilized to analyze the mechanics states of the AC overlay on the concrete pavement, which is emphasized on the shearing stress and the deflection difference at the joints between two slab edges induced by vehicle loads. On the base of great deal computation, the critical loading position is presented and the variation tendency influenced by some parameters on AC stresses is analyzed. The theoretical value is also provided for application of the design method of AC overlay on the existing cement concrete pavement.