耐久性沥青路面混凝土基层轴载换算研究

刚性基层耐久性沥青路面作为一种新型的路面结构,现行规范对于上覆沥青层水泥混凝土路面的设计思路对其并不适用,其轴载换算公式由于没有考虑刚性基层沥青路面结构的特点,得出的结果存在较大误差。依据普通混凝土及贫混凝土的疲劳方程,结合耐久性沥青路面混凝土基层在标准轴载和不同轴-轮型荷载作用下回归得出的荷载应力计算公式,按照混凝土基层等效疲劳损伤原则,推求得出单轴-单轮、单轴-双轮组、双轴-双轮组荷载换算为标准轴载的公式。结果表明:得出的轴载换算公式可充分考虑混凝土基层耐久性沥青路面基层厚度、基层模量、地基模量结构设计参数的影响,具有良好的实用性,可为路面结构设计提供依据。

Study on Axle Load Conversion for Concrete Base of Durable Asphalt Pavement

As a new kind pavement structure,the design method of cement concrete pavement with asphalt surface course in the current specification is not suitable to the durable asphalt pavement with rigid base.Since the characteristics of durable pavement with rigid base are not taken into account,there exists large error in the results getting from the axle-load conversion equation.According to the fatigue equations of popular concrete and lean concrete,the load stress calculation equations rigid base in durable asphalt pavement subjecting standard axle load and different axle-wheel load,and the equivalent fatigue damage principle of concrete base,the axle load conversion equations from the load of single-axle and single-wheel,single-axle and two-wheel and two-axle and two-wheel to the standard axle load are derived.The results show that the axle load conversion equations got in the paper can fully consider the influences of the structure design parameters of base depth,base modulus and subgrade modulus etc.of durable asphalt pavement with concrete pavement,so the equations have good suitability and can provide basis for pavement structure design.