基于MEPDG的组合式基层沥青路面车辙预估  

Predicting Rut of Composite Base Asphalt Pavement Based on MEPDG

作　　者：陈岳峰 CHEN Yue-feng(Expressway Construction Headquarters of Fujian Province,Fuzhou Fujian 350001,China)

机构地区：[1]福建省高速公路建设总指挥部,福建福州350001

出　　处：《公路交通科技》2020年第12期15-23,共9页Journal of Highway and Transportation Research and Development

摘　　要：为研究组合式基层沥青路面结构抗车辙性能,采用AASHTO力学经验设计法MEPDG车辙预估模型,依托福建省某高速公路沥青路面开展了车辙预测研究。按照水平1输入参数要求,交通参数、气候参数通过实测统计获得,其他路面结构和材料参数按照水平2或水平3要求输入;基于此,分析了沥青路面各结构层动态模量2019年全年的分布规律,预估了该结构沥青路面车辙20 a的演变规律,并研究了温度和交通荷载对路面变形的影响。结果表明:全年高、低温条件下,沥青路面各结构层动态模量差异能达到10倍以上;该结构中面层的车辙变形最大,下面层和级配碎石层的车辙变形较小,可推断该结构沥青路面不会产生较大的结构性车辙,增加中面层的抗车辙性能对于保证路面整体结构的高温性能至关重要;以15 mm作为容许车辙变形控制标准,该结构抗车辙寿命可达18 a以上;高温时段该结构容易产生车辙,通过引导重型货车20:00—08:00运营,可以有效降低沥青路面车辙变形;低速、特重载条件下,该结构下面层、级配碎石层车辙变形与重载条件差异较小,表明低速、特重载对下面层、级配碎石层抗车辙性能影响较低。In order to study the rutting resistance rutting prediction study is carried out based on the asphalt pavement of a highway in Fujian Province by using the MEPDG rutting prediction model of AASHTO mechanical empirical design method.The traffic parameters and climate parameters are obtained through actual measurement statistics according to the input parameter requirements of level 1,and other pavement structural and material parameters are input by level 2 or level 3.Based on this,the distribution of the dynamic moduli of each structural layer of the asphalt pavement in 2019 is analyzed,the rutting evolution of the asphalt pavement of this structure in 20 years is forecasted,and the influence of temperature and traffic load on rutting deformation is studied.The result shows that(1)The difference in dynamic modulus of each structural layer of the asphalt pavement can reach more than 10 times under high and low temperature conditions throughout the year.(2)The middle surface layer of the structure has the largest rutting deformation,while the lower surface layer and the graded gravel layer have smaller rutting deformation.It can be inferred that the asphalt pavement of the structure will not produce larger structural rutting,and increasing the rutting resistance of the middle surface layer is crucial to ensure the high-temperature performance of the overall pavement structure.(3)With 15 mm as the allowable rutting deformation control criterion,the rutting resistance life of the structure can reach more than 18 years.(4)This structure is prone to rutting during high temperature periods.By guiding heavy-duty trucks to operate from 20:00 to 08:00,the rutting deformation of the asphalt pavement can be effectively reduced.(5)Under the conditions of low speed and extremely heavy load,there is little difference between the rutting deformation of the lower surface layer the graded gravel layer and those heavy load traffic conditions,indicating that the influence of low speed and extremely heavy load on the rutting resistan

关 键 词：道路工程 组合式基层 MEPDG 车辙 温度 预估 

分 类 号：U416.2[交通运输工程—道路与铁道工程]