沥青混凝土路面表面形貌及抗滑性能的分形表达研究

Description of Surface Morphology and Skid Resistance of Asphalt Concrete Pavement with Fractal Theory

为描述沥青混凝土路面的表面形貌及抗滑性能,通过图像处理技术提取沥青混凝土路面数字图像的灰度等值线进行分形分析,获得分形参数。结果表明:沥青混凝土路面具有显著的分形特性,分形维数越大沥青混凝土路面形貌越复杂;尺度参数越大,沥青混凝土路面构造纹理越粗大。提出一个结合了分形维数和尺度系数的粗糙度函数来描述沥青混凝土路面的表面形貌,可以同时描述沥青混凝土路面表面形貌的复杂程度和纹理构造。试验结果表明,沥青混凝土路面的抗滑性能与粗糙度函数值有良好的相关性,粗糙度函数值越大,抗滑性能越好。

In order to describe the surface morphology and skid resistance performance, the gray con-tour of asphalt concrete pavement digital image is extracted to fractal analysis, the fractal parameters re-sults show that the asphalt concrete pavement has significant fractal characteristics, the larger the fractal dimension, the more complex the asphalt pavement morphology; the larger the scale coefficient, the more coarse the asphalt concrete pavement texture. A roughness function, which combined with fractal dimen- sion and scale coefficient, is put forward to the asphalt surface morphology. At the same time, it can also describe the complex degree and texture structure of asphalt concrete pavement. The test results show that the asphalt concrete pavement skid resistance performance and roughness function value has a good correla-tion, the greater the roughness function value, the better the skid resistance performance.