基于接触力学的路面构造粗糙度评价

为了给路面抗滑构造设计与优化提供指导,使得设计的隧道水泥混凝土路面具有更好的抗滑性能,针对目前路面抗滑性能评价指标的不足,基于轮胎与路面接触作用机理,从接触力学的角度提出一种轮胎有效接触界面的构造粗糙度评价方法。通过对四种不同路面的胎/路接触应力分布特性进行比较,对接触应力分布非均匀性和应力集中效应进行分析,并提出了相应的评价指标。结果表明:结合室内试验与现场路面压力胶片测试,不同路面上的轮胎接触应力分布为典型的非均匀分布状态,且具有一定的随机分布特性,可以从接触力学的角度反映路面构造分布形态。应力峰值可以表征单点构造峰顶接触应力最大值,直接反映了路面构造与轮胎的包络变形程度,而Weibull模量可以从接触界面上进行整体的应力分布均匀性评价,属于间接性面域评价指标,二者的结合能够更加全面地进行路面的构造粗糙度评价。

Evaluation of Pavement Texture Roughness Based on Contact Mechanics

In order to provide guidance for the design and optimization of pavement texture, which will improve the skid resistance performance of tunnel cement concrete pavement. The shortage of the current evaluation indexes on pavement skid resistance performance was analyzed. Based on the contact mechanism between tire and pavement, a method of texture roughness evaluation on the tire effective contact interface was proposed from the perspective of contact mechanics. Finally the targeted evaluation indexes were proposed. The results show that the tire contact stress distribution on different pavements is typical non-uniform with random distribution characteristics based on laboratory and field test. The distribution rule of pavement texture can be described from contact mechanics. The maximum contact stress on the single asperity can be characterized by peak stress index, which can directly reflect the degree of envelope deformation between pavement and tire. The overall stress distribution uniformity on the contact interface can be evaluated by Weibull modulus index, which belongs to the evaluation index of indirect and surface domain. The pavement texture roughness can be evaluated more comprehensively by these two indexes.