旧水泥混凝土路面上沥青混凝土加铺层的力学机理分析

在旧水泥混凝土路面上加铺沥青混凝土层的技术，关键是如何防止反射裂缝。温度荷载与车辆荷载作用所引起的剪切破坏，是沥青混凝土加铺层（AC层）结构产生反射裂缝的主要原因之一。采用三维有限元法对旧水泥混凝土路面上AC层进行了数值模拟分析，重点考察了在车辆荷载作用下接缝处AC层的剪应力与弯沉差，并且分析了加铺层厚度、旧水泥混凝土板的厚度、地基弹性模量等参数对最大剪应力及最大弯沉差的影响。结果表明，合理确定加铺层的厚度．对于预防和控制反射裂缝产生和发展具有重要的作用。

Mechanism Analysis of Mechanics of AC Overlays on Old Cement Concrete Pavements

A method for improving the carrying capacity and reflection cracks of old cement concrete pavements is to add asphalt concrete overlay on it.Shearing breach which comes from vehicle loads is one of the main reasons for producing reflection cracks of asphalt concrete overlay structure.Aimed at this actual background of project,a numerical modeling analysis of old cement concrete and AC layer is presented by using the finite element method.Shearing and deflection difference of AC layer at the joints are the main consideration,and many other factors(thickness of the cement concrete pavement,thickness of AC,elastic modulus of ground base,etc.) which affect it are analyzed.The results show that it is very important to choose thickness of AC reasonablely for preventing and controlling the generation and diffusion of reflection cracks.