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采用有限元方法,建立了重载铁路路桥过渡段双线路基整体三维模型,分析了动荷载作用下双线路基动力响应规律。研究发现:相向移动荷载作用下路基横向上各点的位移曲线呈“W”形状,路基左右两侧荷载作用面积中心下的位移最大;路基左侧最大位移要大于右侧最大位移,点离荷载中心越近,该点位移波动变化越剧烈。结果表明:荷载除对其作用一侧的路基位移有影响外,又加剧了路基另一侧位移;沿深度方向,荷载对路基位移的影响逐渐减弱。
The finite element method is used to establish a three-dimensional model of double-track embankment in transitional section of heavy haul railway, and the dynamic response of double-track subgrade under dynamic load is analyzed. The results show that the displacements curve of each point in the transverse direction of the subgrade is “W ”, and the displacement under the center of load acting on the left and right subgrade is the largest. The maximum displacement of the left subgrade is greater than the maximum displacement of the right subpoint, The closer to the load center, the more violent the change of displacement at this point. The results show that the load aggravates the displacement on the other side of the subgrade besides its influence on the subgrade displacement. On the other hand, the influence of load on the subgrade displacement decreases gradually along the depth direction.