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为了研究拼接路面结构的合理设计方法,依托合宁高速公路扩建工程对拼接工况下沥青面层的疲劳损伤特性进行分析。基于拼接接缝两侧基层的当量回弹模量分布规律和以应力为变量的沥青混凝土损伤演化方程,通过接缝区域沥青面层的损伤状况,分析不同路面结构参数和轴载水平对沥青面层寿命的影响。随着轴载次数的累积,道路会出现加速破坏的趋势。接缝两侧基层顶面的当量回弹模量差异是决定接缝处沥青层疲劳寿命的关键因素,而依靠增加接缝处沥青层厚度来延缓反射裂缝的效果不明显。结果表明,接缝区域沥青面层疲劳损伤的研究可以用来指导路面结构的优化设计,并可对《公路沥青路面设计规范》(JTG D50—2006)中沥青面层的当量轴次和抗拉强度结构系数中的参数进行拼接工况下的优化。
In order to study the reasonable design method of spliced pavement structure, the fatigue damage characteristics of asphalt surface under splicing condition are analyzed based on the extension project of Hening Expressway. Based on the distribution law of the equivalent elastic modulus of the grass roots on both sides of the spliced seams and the damage evolution equation of asphalt concrete with the variable of stress, the influence of structural parameters of different pavement and loading level on asphalt surface The impact of layer life. With the cumulative number of axle load, the road will accelerate the destruction of the trend. The difference of equivalent elastic modulus of the top surface of seams on both sides of seams is the key factor to determine the fatigue life of asphalt layer at seams, and the effect of retarding reflective cracks by increasing the thickness of asphalt layer at seams is not obvious. The results show that the fatigue damage of asphalt surface in the joint area can be used to guide the optimization design of pavement structure, and the equivalent axial times and tensile resistances of asphalt pavement in “Code for design of highway asphalt pavement” (JTG D50-2006) The parameters in strength structure coefficient are optimized under splicing conditions.