参数变化对沥青加铺层结构应力的影响分析

Influence of parameters variety on the stresses of asphalt overlay structure

交通荷载及温度变化是引起旧水泥混凝土路面沥青加铺层反射裂缝的两大因素.交通荷载主要引起加铺层剪切型反射裂缝,温度变化主要引起加铺层张开型反射裂缝.采用三维有限元方法分析了轴载、温度变化幅度及加铺层模量、厚度等参数变化对旧水泥混凝土路面沥青加铺层的荷载应力、温度应力及耦合应力的影响程度,为沥青加铺层的设计方法提供了依据.

Traffic loading and temperature variety are two main factors to induce reflective cracking of asphalt overlay on old cement concrete pavement. Traffic loading induces shear style reflective cracking and temperature variety induces expansion style reflective cracking. The 3-D FEM is used to analyze the influence of parameters of axles loading, temperature variety, modulus and height of overlay on loading stresses ,thermal stresses and coupling stresses in asphalt overlay on old cement concrete pavement,it offers basis for design methods of asphalt overlay.