湿度影响下的重载交通沥青路面动力响应

Dynamic Response of HeavyDuty Asphalt Pavement Affected by Moisture

摘要:

考虑地下水和雨水入渗的影响，运用ABAQUS软件建立重载交通沥青路面动力分析模型，分析地下水上升和降雨入渗引发路基湿度变化后的路基动态回弹模量分布规律，以及三轴双轮移动重载作用下沥青路面的动力响应.分析结果表明，地下水距路基顶面越近，对路基模量的分布影响也越显著，降雨入渗与动载共同作用处的路基模量折减更明显；地下水位距路基顶面高度从6 m减至2 m时，面层层底拉应变由70×10-6增至173×10-6；降雨强度增大对外侧车道处的面层层底拉应变影响巨大，对中间车道的影响较小；降雨天数增加，两侧车道的面层层底拉应变反而减小，而中间车道的趋势相反，拉应变随着降雨天数增加而增大.

Abstract:

Taking into consideration the impact of underground water and infiltration, a dynamic analysis model of asphalt pavement under heavy load traffic was established by using ABAQUS. The distribution characteristics of subgrade resilient modulus caused by moisture change resulting from underground water rising and rainfall infiltration was investigated, and the dynamic response of asphalt pavement under heavy load of threeaxis with two wheels was analyzed. It is shown that the subgrade resilient modulus is seriously affected when underground water rises, and the reduction is more significant where the subgrade is affected by rainfall and traffic load. The tensile stain at the bottom of surface course increases from 70×10-6 to 173×10-6 when the distance from underground water to the subgrade top decreases from 6 m to 2 m. Rainfall intensity has a huge effect on the tensile stain at the bottom of the surface course of outside lanes and a smaller effect on that of inside lanes. As rainfall days grow, the tensile stain at the bottom of the surface course of outside lanes declines while that of inside lanes increases which behaves in an opposite way.