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沥青路面抗滑性能定量评价的分形方法

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Keywords: 道路工程,沥青混合料,分形方法,抗滑性能,集料级配

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Abstract:

?采用离散型外露尺寸函数研究了沥青混合料表面微观凸凹的随机分布特征,并根据统计自相似性原理推导了路面微观凸凹的外露尺寸函数的计算公式和级配分维数值的计算方法。利用该方法计算了AK-16A和开级配抗滑磨耗层(OGFC)不同级配路面的外露尺寸函数值;并用摆式摩擦仪对相应级配的车辙板进行试验,确定了混合料表面纹理对应的抗滑系数。结果表明:沥青混合料级配不同,其路面微观凸凹的分维数值也不同;分维数值越大,外露尺寸函数的指数值越大,抗滑性能越高;外露尺寸函数的指数值越小,抗滑性能越低;微观凸凹分维数值与路面抗滑性能具有单调递增的一致相关性。

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