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为获得道面表面构造纹理参数对其抗滑性的影响规律以科学指导道面抗滑性设计和施工,基于水泥混凝土道面表面宏观构造、粗观构造和细观构造对抗滑性影响因素和摩阻机理的分析,探讨了道面宏观构造对胎面所产生的变形摩擦力分量、表层微细构造尖端对胎面微切削摩擦力的力学行为,提出了基于道面纹理间距、纹理凸体棱角坡度、纹理凹陷深度和宽度等构造参数的摩擦因数分析模型。基于弹性包络理论,分析了纹理间距、凸体棱角坡度、凹陷深度和宽度等参数对轮胎变形摩阻和微切削摩阻的影响规律,并分别对不同纹理间距、凸体棱角坡度和凹陷深度的水泥混凝土道面试件进行了实验室试验。结果表明:凹陷深度在2~6mm之间增大时,其抗滑性均显著增大;但当凹陷深度超过4mm后,间距较密(小于20mm)的纹理凸体棱角坡度对抗滑性影响很小;而间距较疏(大于25mm)的纹理凸体棱角坡度对抗滑性影响显著,且其抗滑性随凹陷深度增大显著,因此,在纹理较稀疏的道面上有必要加深凹陷深度,而较密纹理的道面上加深凹陷深度则无意义;纹理凸体棱角坡度的钝化对抗滑性影响的规律显著,但当凸体棱角坡度被磨损钝化到45°后,纹理间距几乎不再影响其抗滑性,因此,对于容易磨损钝化的道面,当纹理间距小于20mm时,再加密纹理难以增大其摩阻性。
In order to obtain the influence law of the texture parameters of the pavement surface texture on its skid resistance, the skid resistance design and construction are guided by the science. Based on the influence factors of the macrostructure, rough structure and mesostructure on the skid resistance of the cement concrete pavement surface and Friction mechanism analysis of the pavement macrostructure on the deformation of the friction force generated by the surface, the surface microstructure of the tread micro-cutting friction on the mechanical behavior of the tread, proposed based on the pavement texture spacing, texture convex edge angle Slope, texture depth and width of depression and other structural parameters of the friction factor analysis model. Based on the elastic envelope theory, the effects of parameters such as grain spacing, convexity slope angle, depth and width of pits on the deformation resistance and micro-cutting friction of the tire were analyzed. The effects of different grain spacings, convexity angle and depth Of cement concrete pavement specimens for laboratory tests. The results show that when the depth of dimple increases from 2mm to 6mm, the skid resistance increases significantly. However, when the dimple depth exceeds 4mm, While the pitch of texture convexity with sparse pitch (greater than 25mm) has significant influence on skid resistance, and its skid resistance increases significantly with the depth of the depression. Therefore, it is necessary to deepen the depth of depression on the sparsely paved surface, However, it is meaningless to deepen the depth of depression on the pavement with denser texture. The influence of the passivation of the texture convexity slope on the skid resistance is significant. However, when the convex edge slope is worn and passivated to 45 °, the texture spacing is almost not And then affect its skid resistance, therefore, for easy to wear passivated pavement, when the texture spacing is less than 20mm, re-encryption texture is difficult to increase its frictional resistance.