高速列车荷载作用下路基动力特性模拟仿真研究

Research on Simulation of Dynamic Characteristics of Roadbed Under High Speed Train Load

为研究高速列车荷载作用下路基动力特性,文中利用数值模拟方法建立高速铁路路基工程仿真模型,对高速铁路路基动应力与竖向位移的分布以及衰减规律进行分析。结果表明,随着时间的增加,基床表面竖向位移呈现先快速增加后缓慢增加、再降低后稳定的变化规律,最终的竖向位移值为0.29mm。随着深度的增加,动应力呈现线性降低的变化规律。基床表面支承层动应力下降阶段的斜率为0.068mm/m,钢轨正下方动应力下降阶段斜率值为0.061mm/m,路基中心正下方动应力值下降阶段斜率值为0.053mm/m。所有位置的竖向动位移分布规律均呈现先缓慢下降后快速下降的变化规律。

In order to study the dynamic characteristics of roadbed under the action of high-speed train load,a simulation model of high-speed railway roadbed engineering was established by using numerical simulation method,and the distribution and attenuation law of dynamic stress and vertical displacement of high-speed railway roadbed were analyzed.The results show that with the increase of time,the vertical displace-ment of the surface of the foundation bed increases rapidly at first,then increases slowly and then decreases steadily,and the final vertical dis-placement value is 0.29 mm.With the increase of depth,the dynamic stress shows a linear decreasing change rule.The slope of the dynamic stress decreasing stage of the support layer on the surface of the foundation bed is 0.068mm/m,the slope value of the dynamic stress decrea-sing stage directly under the rail is 0.06lmm/m,and the slope value of the dynamic stress decreasing stage directly under the center of the roadbed is 0.053mm/m.The vertical dynamic displacement distribution at all locations showed a change law of slow decline at first and then rapid decline.