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为了研究现实车载作用下半刚性基层沥青路面动力响应的规律,为耐久性路面的设计提供基础数据,在修筑的试验路沥青面层、水泥稳定碎石基层及底基层的底部埋设大量光纤光栅应变及温度传感器,测试并分析了半刚性基层沥青路面在不同路面结构、不同层位、不同轴载、不同行车速度下的瞬时应变行为。研究结果表明:3种路面结构表现出相似的动载响应情况,结构1采用大厚度半刚性层,刚度逐渐过渡,即使在超重慢速不利条件下,整体结构应变水平很低;路面内部受拉响应最大层位为中面层,其次为半刚性层;中面层对动载响应敏感,尤其是轴载引起的变化较大,半刚性层底拉应变在慢速交通下与轴载有很好的线性相关关系。
In order to study the law of dynamic response of semi-rigid base asphalt pavement under the action of vehicle-mounted vehicle, provide basic data for the design of durable pavement, embed a large number of FBG strains on the asphalt pavement, cement stabilized gravel base and bottom of the pavement, And temperature sensors, the instantaneous strain behavior of semi-rigid asphalt pavement under different pavement structure, different horizon, different axle loads and different driving speeds was tested and analyzed. The results show that the three kinds of pavement structures show similar dynamic load response. Structure 1 adopts large thick semi-rigid layer and its rigidity gradually changes. Even under the condition of overweight and slow speed, the overall structural strain level is very low. The response of the maximum horizon is the middle layer, followed by the semi-rigid layer; the middle layer is sensitive to the dynamic response, especially the large changes caused by the axial load, the semi-rigid layer bottom tensile strain Good linear correlation.