面层模量对重载交通沥青路面受力特性及使用寿命的影响分析

面层模量是路面设计的重要力学参数,它的取值将直接影响到路面结构的设计结果及受力特性。应用路面计算程序,系统分析面层模量变化对重载交通沥青路面路表弯沉、基层层底拉应力、底基层层底拉应力以及路面结构疲劳寿命的影响,并阐述其影响规律。结果表明,面层模量对重载交通沥青路面的受力与变形特性及使用寿命具有显著的影响,提高面层模量值将增大面层应力,显著减小路表弯沉值、基层及底基层层底拉应力,进而提高路面的疲劳寿命。

Analysis on Influence of Modulus of Surface Layers on Stress Characteristic and Service Life of Heavy-loadTraffic Asphalt Pavement

The modulus of surface layers is the important mechanics parameter of pavement design.Its value will directly affect the deign result and stress characteristic of pavement structure.The pavement computation program is used to systematically analyze the influence of modulus variation of surface layers on the surface deflection of heavy-load traffic asphalt pavement,the bottom tension stress of base,the bottom tension stress of subbase and the fatigue life of pavement structure.The article sets forth its influence law.The result shows that the modulus of surface layers has the obvious influence on the stress,deformation character and service life of heavy-load traffic asphalt pavement.The enhancement of the modulus value of surface layers will increase the stress of surface layer,and obviously decrease the deflection value of road surface,and the bottom tensional stresses of base and subbase so as to improve the fatigue life of pavement.