表面排水条件对饱水沥青路面动力响应的影响分析

Influence of Surface Drainage Conditions on Dynamic Response of Saturated Asphalt Pavement

首先建立动态荷载作用下,饱和状态沥青路面轴对称瞬态动力分析有限元模型,并给出有限元分析的荷载条件、边界条件和材料参数;而后分析表面排水和表面不排水两种条件下的竖向位移、竖向应力、水平应力、剪应力和孔隙水压力沿深度方向的分布和时程变化,以确定表面排水条件对饱和状态沥青路面动力响应的影响。结果表明,与表面排水条件相比,表面不排水状况对位移场影响不大,而对应力场影响较大;后者在轮胎边缘外侧产生了较大的竖向拉应力,同时产生了更大的正孔隙水压力,使得路面结构处于更加不利的受力状态。

At first, finite element model of axisyrnmetric transient dynamic analysis for saturated asphalt pavement subjected to dynamic loading was built, whose loading condition, boundary condition and material parameters were also listed out. Then the distribution along the depth and time history variation of vertical displacement, vertical stress, horizontal stress, shear stress and pore pressure in surface drainage case and surface non-drainage case were compared and analyzed.The result indicates that the surface non-drainage condition has less influence on the displacement field, while it has an obvious impact on the stress field.For the surface no-drainage case, a higher vertical stress appears at the outsides of vehicle wheels, what＇ s more, a higher positive pore pressure is produced, which makes asphalt pavement structure in a more adverse situation