重载作用下典型路面结构动态响应数据采集与分析

通过在试验路埋设沥青应变仪、温度场传感器等路面响应监测设备,采集了荷载和环境因素作用下不同路面结构沥青层底动态应变响应,分析了动态应变响应特征和应变响应与路面温度、轴载的关系,比较了不同结构的沥青层底最大应变值,构建了路面结构沥青层底应变响应预估模型,揭示了不同路面结构在重载及温度耦合作用下的沥青层底动态应变响应规律。研究结果表明,随着轴载的增加、路面温度的升高,沥青层底最大拉应变增大;不同路面结构沥青层底应变响应变化与其结构组合、交通荷载及环境因素有关,表现出一定的重载和温度敏感性差异;在对比的结构中,组合式基层结构比永久性路面结构具有更小的沥青层底拉应变,传统半刚性基层结构在重载和较高路面温度下具有较大的沥青层底应变响应。

Typical Pavement Structure Dynamic Response Data Collection and Analysis under Heavy Vehicle Loading

By installing asphalt strain gauges and temperature thermometers in typical pavement structures,dynamic strain data at asphalt Layer bottom were collected by high speed data collection system under the action of moving vehicle load and environmental factors.Dynamic strain characteristics and its relationship with axle load and pavement temperature was analysed,the maximum strains at asphalt layer bottom of different pavement structures were compared.The prediction models for strain at asphalt layer bottom were built,and the principle of strain response at asphalt layer bottom under heavy axle loads was discovered.It shows that(1)The strain at asphalt layer bottom increases when axle load and pavement temperature increase.(2)The abovementioned strain changes when pavement structure,traffic load and environment change, and the strain has different sensitivities to axle load and temperature.Among them,the combined base structure has less tensile strain at asphalt layer bottom than that in the conventional perpetual pavement structure,and the semi-rigid pavement structure shows higher asphalt layer bottom strain than other structure under the action of heavy axle load and high pavement temperature.