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为探讨动载效应作用下沥青路面的实际动力响应规律,以实体工程为依托,铺筑3种典型沥青路面结构的试验路,开展了沥青路面结构的动、静弯沉盆对比分析,深入研究了动态弯沉盆特性,并通过预先埋设于路面结构中的动态应变传感器,获取了落锤式弯沉仪(FWD)荷载作用下的层底弯拉应变响应。研究结果表明:沥青路面结构中各测点的动态弯沉盆小于静态弯沉盆,而动态弯沉盆的影响范围大于静态弯沉盆,动、静弯沉盆曲线表现出不同的几何特性;沥青路面结构的动态响应随FWD荷载大小的变化关系反映出非线性特性;3种典型沥青路面结构的面层底应变状态处于低应变水平,基本不构成路面的累积疲劳损伤,其纵向应变响应大于横向应变;分别建立了3种沥青路面结构基于动态弯沉盆参数指标的沥青路面结构面层底纵、横向应变预估模型。
In order to explore the actual dynamic response of asphalt pavement under the effect of dynamic load, three types of typical asphalt pavement test roads were constructed based on the physical engineering. The comparative analysis of dynamic and static bending settlement of asphalt pavement structure was carried out. The characteristics of dynamic deflection bowl were studied. The bending strain response of bottom layer under the load of FWD was obtained by the dynamic strain sensor pre-embedded in the pavement structure. The results show that the dynamic deflection basin of each measuring point in asphalt pavement structure is smaller than that of the static deflection basin, while the dynamic deflection basin has greater influence range than the static deflection basin. The dynamic and static deflection curves have different geometric characteristics. The dynamic response of asphalt pavement structure changes nonlinearly with the variation of FWD load. The bottom surface strain state of three typical pavement structures is at low strain level, and does not constitute the cumulative fatigue damage of the pavement. The longitudinal strain response is greater than Horizontal and vertical strain of asphalt pavement structure surface were respectively established. Based on the parameters of dynamic deflection basin parameters, three models of longitudinal and lateral strain prediction of asphalt pavement structure surface were established respectively.