重载作用下路面结构不均匀破坏特性

Inhomogeneous damage characteristics of surface structure under heavy load

为了研究路面结构中同一层面强度不均对路面的影响,进行了车辆的轴重及其轮胎接地面积和压力的研究,基于实际轴载的作用形式,应用弹性层状体系理论建立路面结构的有限元模型。分析了重载作用下,公路沥青路面路面结构的力学响应。分析结果表明,在路面结构同层材质不均的情况下,沥青路面损坏的主要原因是轴载对路面结构作用产生过大的不均匀沉降使路面一次性加载在路面产生水平方向的拉应力导致拉张破坏。

To study the effect on pavement structure which the intensity is asymmetric in the same layer, the axle weights of vehicles and tire-pavement contacting areas and pressures were researched. The pavement structure model of finite element method（FEM） program were set up ,respectively with multiplayer system elasticity theory program, based on the actually applied patterns of heavy loading. Mechanical responses of the asphalt pavement structures were analyzed. Analysis shows that the distresses of asphalt pavement of the real highway results from the damage by asymmetric sedimentation which is under excessively axle loading on pavement structure, rather than the fatigue damage by axle loading repetitions in the condition of asymmetric intensity in the same layer.