循环位移荷载作用下路基动力响应特征

Dynamic Response Characteristics of Subgrade Under Cyclic Displacement Load

以实际填土路基为原型,通过ABAQUS软件构建了动荷载-路基耦合三维仿真模型,分析在循环位移荷载作用下路基表面以及内部的动力响应特征。结果表明:路基表面的动应力随着水平距离的增加而减小,随着加载位移的增加而增加,且随着加载位移幅值、频率的增加由递增趋势逐渐转变为先增后减的趋势;在路基内部垂直方向,加速度峰值在加载位移及频率较小的时候随着深度的增加而递减,然后随着加载位移及频率的增大,逐渐演变为先增后减的趋势,其转折点位于路基表层与下层土体的分界处。

A three-dimensional simulation model of dynamic load subgrade coupling was constructed using ABAQUS software based on the actual filled subgrade as a prototype,and the dynamic response characteristics of the surface and interior of the subgrade under cyclic displacement loads were analyzed.The results show that the dynamic stress on the surface of the subgrade decreases with the increase of horizontal distance,increases with the increase of loading displacement,and gradually changes from an increasing trend to a first increasing and then decreasing trend with the increase of loading displacement amplitude and frequency.In the vertical direction inside the subgrade,the peak acceleration decreases with depth when the loading displacement and frequency are small.Then,as the loading displacement and frequency increase,it gradually evolves into a trend of first increasing and then decreasing.The turning point is located at the boundary between the surface layer of the subgrade and the lower layer of soil.