1三维有限元模型-同济大学学报.doc

湿度影响下的重载交通沥青路面动力响应 陶泽峰，钱劲松，凌建明，蔡氧 （同济大学 道路与交通工程教育部重点实验室，上海 201804） 摘要：考虑雨水入渗和路基湿度的影响，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，受降雨入渗影响与荷载作用处的模量折减更明显；地下水位距路基顶面高度从6m减至2m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。 关键词：道路工程；动力响应；路基湿度；重载交通 Dynamic response of heavy-duty asphalt pavement affected by moisture TAO Zefeng, QIAN Jingsong , LING Jianming, CAI Yang ( Key Laboratory for Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 201804, China) Abstract: Impact of infiltration and subgrade moisture were taken account into, dynamic analysis model of asphalt pavement under heavy load traffic was established by ABAQUS, distribution characteristics of subgrade resilient modulus affected by moisture change resulting from unground water rising and rainfall infiltration was investigated, and then dynamic response of asphalt pavement under heavy load of three-axis with two wheels was analyzed. It is shown that, subgrade resilient modulus was affected seriously when unground water rose higher, and the reduction was more obvious where subgrade was affected by rainfall and traffic load, tensile stain at bottom of surface course increased from 70×10-6 to 173×10-6 when the distance from unground water to subgrade top decreased from 6m to 2m. Rainfall intensity growth had a huge effect on tensile stain at bottom of surface course of outside lanes and a smaller effect on that of inside lanes. Otherwise, as rainfall days growing, tensile stain at bottom of surface course of outside lanes declined while that of inside lanes increased which behaved opposite performance. Key words: highway engineering; dynamic response; subgrade moisture; heavy load traffic. 湿度是影响沥青路面长期性能的重要因素，常见的路面水损坏和路基湿化均与湿度有明显的关联。同时，受降雨入渗和地下水波动影响，路基模量的衰减也将进一步导致路面长期性能的衰变，而交通超载现象更加剧了荷载与水的耦合作用。故湿度不仅直接影响路面应力状态，而且也会通过改变路基模量而反馈至路面响应，显著影响路面的疲劳使用寿命。因此