基于车辙谱的沥青路面轴载限研究

在对全国各地大量高速公路轴载数据调查分析的基础上,比较了不同轴型作用下的沥青路面剪应力场,提出基于车辙的多轴型数据处理方法.通过该方法对各地轴载谱数据进行换算,并采用换算后的数据,分析不同水平轴载对沥青路面车辙的影响,据此提出轴载限的确定方法,计算各级轴载对车辙的贡献,并给出典型省份的轴载和车辙谱.研究表明,不同轴组类型作用时路面内相同位点处最大剪应力值较为接近.荷载对路面变形特性的影响可以分为3个层面:对于≤10t荷载,路面具有很稳定的抗力;对于>10~15t轴载,路面具有较稳定抗力;对于>15t轴载,路面难以提供稳定抗力.采用抗剪强度较高的改性沥青材料对沥青路面车辙的改善效果明显.

Study of Axle Load Limit Based on Asphalt Pavement Rutting Spectrum

To study the influence of axle load on asphalt pavement rutting, large amounts of highway axle load data around China were collected and analyzed. Then, the shear stress of pavements under three different axle types was analyzed, based on which the method to convert axle load spectrum of various axles to one standard axle was established and the collected load data were processed. The contribution of axle load at each level to pavement rutting was calculated and the rutting spectrums with axle load spectrums of typical provinces were plotted. The influence of different axle load on pavement rutting was studied using the processed data. It is found that the influence can be divided into three levels: for the standard axle load which is less than 10 tons, the pavements resist the deformation very well; for those between 10 to 15 tons, the pavements resist deformation well; for those bigger than 15 tons, the pavements resist the deformation poorly. Then the relationship between shear strength and standard axle load was studied, it is found out that using modified asphalt which has high shear strength can alleviate the rutting problem.