有轨电车荷载作用下路基结构动力响应分析

采用有限元程序ABAQUS建立数值模型，研究有轨电车路基在荷载作用下的动应力变化规律，分析有轨电车动应力随着不同行车速度、路基横断面位置、路基深度的传递规律，同时分析不同基床结构与地基土下动力响应的变化情况。结果表明：动应力在路基中呈现出两端大，中间小的特点，总体上呈马鞍形分布；有轨电车轮载所引起的附加应力快速衰减，在深度达到0.7 m左右时，动应力衰减一半；路基结构中的动应力随基床结构弹性模量的增大而逐渐减小，并且受基床底层弹性模量影响更大；随着地基土弹性模量增大，路基结构内动应力会略微增大，但路基结构的竖向位移会大大减小。

Dynamic Response Analysis of Subgrade Structure under Tram Load

A numerical model is established by using the ABAQUS finite element program to study the variation law of dynamic stress of tram subgrade under load. The transmission rule of tram dynamic stress with different running speeds, subgrade cross-sectional positions and subgrade depths is analyzed, and the dynamic response changes under different subgrade structures and foundation soil are also analyzed. The results show that the dynamic stress in the subgrade presents the characteristics of large at both ends and small in the middle, which is generally distributed in a saddle shape; the additional stress caused by the wheel load of tram decays rapidly; when the depth is about 0.7 m, the dynamic stress decays by half; the dynamic stress in the subgrade structure gradually decreases with the increase of the elastic modulus of the subgrade structure, and is more affected by the elastic modulus of the subgrade bottom layer; With the increase of the elastic modulus of the foundation soil, the dynamic stress of the subgrade structure will increase slightly, but the vertical displacement of the subgrade structure will be greatly reduced.