既有半刚性基层沥青路面大修处治策略

摘要

In order to make scientific treatment strategies for existing asphalt pavement with semi-rigid base course, a pavement structure analysis model was established by using the Abaqus software. Influence of pavement parameters on fatigue life of semi-rigid sub-base was analyzed. The calculation results were verified by the actual data of the typical sections of expressway in Beijing. And treatment strategies for existing asphalt pavement with semi-rigid base course were put forward. The results show that the effect of base thickness, sub-base thickness, asphalt layers thickness and traffic load on the fatigue life of semi-rigid base materials are more obvious than that of sub-grade modulus and sub-base modulus. The effect of asphalt layers modulus and base layers modulus are relatively small. The practical application of the expressway also shows that the relationship between asphalt pavement overhaul period of the first time and the thickness of asphalt pavement is more significant than that of the total thickness of the pavement structure. The asphalt pavement with thicker asphalt pavement has a longer service life.The decline of material modulus does not affect the durability of the pavement structure and the existing structure of asphalt pavement with semi-rigid base course still have durability and the service life of pavement can be prolonged under the condition that there is not any comprehensive renovation.%为了科学地进行高等级公路既有半刚性基层沥青路面结构大修处治策略,利用Abaqus有限元软件建立路面结构分析模型,分析了路面结构层参数对半刚性底基层抗疲劳寿命的影响,并应用北京市高速公路典型路段的实际数据对计算结果进行了工程验证分析,提出了既有半刚性基层沥青路面大修处治策略.研究结果表明:基层厚度、底基层厚度、面层厚度、交通荷载大小对半刚性底基层疲劳寿命的影响较为显著,路基模量和底基层模量的影响次之,面层模量和基层模量等路用材料刚度的影响相对较小.高速公路实际应用状况也表明:沥青路面首次大修年限与沥青面层总厚度的相关性相比路面结构总厚度更加显著,较厚沥青面层的路面结构具有较长的使用寿命;材料模量出现一定衰变,并不影响路面结构的耐久性基础,旧路结构通过加铺增加面层厚度,在不进行全面翻修改造的情况下,仍可以使路面结构具有充足的耐久性,延长其使用寿命.