摘要
In order to reveal the changing law of the mechanical response of asphalt pavements under the action of vehicle load and provide references for the design of durable pavements,three typical asphalt pavement structures with flexible base(S1),combined base(S2),and semi-rigid base(S3)were selected to perform field strain tests under static and dynamic load using the fiber Bragg grating optical sensing technology.The changing characteristics of the strain field along the horizontal and depth directions of pavements were analyzed.The results indicate that the most unfavorable asphalt pavement layers were the upper-middle surface layer and the lower base layer.In addition,the most unfavorable loading positions on the surface layer and the base layer were the center of wheel load and the gap center between two wheels,respectively.The most unfavorable layer of the surface layers gradually moved from the lower layer to the upper layer with the increase of base layer modulus.The power function relationships between structural layer strain and vehicle speed were revealed.The semi-rigid base asphalt pavement was the most durable pavement type,since its strain value was lower compared to those of the other structures.
为了揭示沥青路面在车辆荷载作用下的力学响应变化规律,为耐久性路面设计提供参考,采用光纤光栅传感技术,对柔性基层(S1)、组合式基层(S2)及半刚性基层(S3)3种典型沥青路面结构开展了动静载作用下的应变现场测试试验,分析了路面应变沿水平和深度方向的应变场变化规律。结果表明,中上面层及下基层底为沥青路面最不利层位;此外,面层和基层的最不利荷载点位分别为轮载中心和轮隙中心;随着基层模量的增加,面层最不利层位逐渐由下面层上移至中上面层;揭示了结构层应变与车速之间的幂函数关系;相对于其他路面结构,半刚性基层沥青路面结构应变值最小,其可作为耐久性路面的优选结构类型。
基金
Projects(51908071,51708071)supported by National Natural Science Foundation of China
Project(2020JJ5975)supported by the Natural Science Foundation of Hunan Province,China
Project(18C0194)supported by the Scientific Research Project of Education Department of Hunan Province,China
Project(kfj190301)supported by Open Fund of Key Laboratory of Road Structure and Material of Ministry of Transport(Changsha University of Science&Technology),China。
