移动荷载下道路病害的弯沉盆特性  

Deflection Basin Characteristics of Distressed Roads under Moving Load

作　　者：蔡迎春[1] 谢申健 CAI Yingchun;XIE Shenjian(Yellow River Laboratory,Zhengzhou University,Zhengzhou,Henan 450001,China)

机构地区：[1]郑州大学黄河实验室,河南郑州450001

出　　处：《中外公路》2024年第3期270-281,共12页Journal of China & Foreign Highway

基　　金：国家自然科学基金资助项目(编号:51908150);广州市科技计划项目(编号:SL2022A04J00985)。

摘　　要：移动荷载作用下道路弯沉盆蕴含路基、路面的病害信息,充分利用移动弯沉盆信息开展道路病害快速无损检测受到行业重要关注。该文通过分析道路病害的弯沉盆特性,为移动弯沉车开发道路病害检测方法提供技术参考。首先建立半刚性基层沥青路面有限元模型,通过设置不同类型和程度的病害有限元模型,分析在移动荷载作用下路表弯沉盆的连续变化情况。结果表明:荷载移动到病害区域时,各病害模型中路表弯沉盆的中心弯沉值均会变大;路面结构层出现横向裂缝时,弯沉盆的形状会发生明显变化,贯通性横向裂缝对弯沉盆形状的影响最明显;基层与底基层局部松散对弯沉盆形状的影响比面层松散对弯沉盆的影响更明显;土基顶部出现空洞时,弯沉盆形状变化不明显;路基唧泥病害会严重影响路表弯沉盆形状与大小。The deflection basins of roads under moving load imply the distress information of subgrade and pavement.Therefore,how to use the information of deflection basins under moving load to rapidly test road distresses non-destructively has received much attention.In this paper,the finite element model of semi-rigid base asphalt pavement was established.By setting different types and degrees of finite element distress models,the continuous changes of surface deflection basins under moving load were analyzed.The results show that when the load moves to the distress area,the center deflection value of surface deflection basins in each distress model will become larger.When transverse cracks appear in the pavement structure layer,the shape of the deflection basins will change.The through transverse cracks have the most obvious influence on the shape of the deflection basins.The influence of the locally loose base and subbase on the shape of the deflection basins is more obvious than that of the loose surface.When a void appears at the top of the subgrade,the shape of the deflection basins is almost unchanged.Subgrade mud pumping will seriously affect the shape and size of surface deflection basins.

关 键 词：半刚性基层沥青路面 病害 移动荷载 有限元 弯沉盆特性 

分 类 号：U416.217[交通运输工程—道路与铁道工程]