基于FWD荷载下的沥青路面实测动力响应分析

沥青路面基于高度条件和重载作用,其受力状态以及静载模式下的受力条件都会产生极大差异.通过试验分析基于动载激励条件下沥青路面的动态响应规律,在此基础上分析沥青路面的损害机理.为研究动态荷载作用下沥青路面的实测动力响应,基于实际工程,构筑了3种典型的沥青路面,采用FWD(落锤式弯沉仪)分析沥青路面的动态弯沉盆特性,通过动态应变传感器,得到基于动态荷载下的层底弯拉应变响应.结果表明:沥青路面结构的动态响应随FWD荷载的变化表现出非线性特性,3种沥青路面结构的面层底具有较低的应变状态,且几乎不对路面累计疲劳造成损伤,相对于横向应变,具有较大的纵向应变能力.

Measured Dynamic Response Analysis of Asphalt Pavement Based on FWD Load

Based on high speed and heavy load conditions of asphalt pavement,there is a great difference of the force of asphalt pavement between stress state and static load mode. Through experiments we can analyze dynamic response law of asphalt pavement based on dynamic load excitation. Then based on this,damage mechanism of asphalt pavement are analyzed. For the study of the measured dynamic response of asphalt pavement,the paper based on the actual project built three kinds of typical asphalt pavement tests. The characteristics of dynamic deflection basin of asphalt pavement are analyzed by using FWD ( Falling Weight Deflectometer) . From dynamic strain sensor, layer bottom flexural tensile strain response is obtained based on dynamic load excitation. The results show that:the dynamic response of asphalt pavement structure exhibits nonlinear characteristics with FWD load. Three kinds of asphalt pavement structure bottom surfaces have lower strain state,and almost don’ t have damage to accumulated fatigue. With respect to the transverse strain,it has a larger longitudinal resilience.