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结合遂渝线无碴轨道桩板结构路基,采用天津(1976年)地震波,基于弹塑性本构关系,建立桩、板和土体的三维实体模型,利用有限元软件ANSYS,对桩板结构路基在地震荷载下的动位移、加速度及竖向应力的动力响应进行数值模拟。分析计算结果可知,在地震荷载下桩板结构路基不同位置处的动位移、加速度响应基本一致,滞后现象不明显;桩底持力层的动位移、加速度幅值略小于其他位置。相对于输入的地震加速度,桩板结构路基响应的加速度幅值被放大,而对应的时刻都滞后于输入的加速度最大值的时刻。在桩截面处的承载板受力不利,所以在桩截面处的板截面需加固处理以满足抗震设计要求。桩的存在对周围土体的动力响应有一定的影响,但总体来说,影响程度很有限。
Based on the seismic wave of Tianjin (1976) and the elastic-plastic constitutive relation, a three-dimensional solid model of pile, slab and soil is established based on the pile foundation of ballastless track in SuiYu line. Using the finite element software ANSYS, The dynamic responses of dynamic displacement, acceleration and vertical stress under earthquake load are numerically simulated. The results of the analysis and calculation show that the dynamic displacement and acceleration response of the pile foundation at different positions under the earthquake load are basically the same, and the hysteresis is not obvious. The dynamic displacement and acceleration amplitude of the pile bottom bearing layer are slightly smaller than those at other locations. Compared with the input seismic acceleration, the acceleration amplitude of the subgrade response of the pile structure is amplified, and the corresponding time lags behind the input acceleration maximum. The load-bearing plate at the pile cross-section is unfavorably stressed, so the plate section at the pile section needs to be reinforced to meet the seismic design requirements. The existence of pile has some influence on the dynamic response of the surrounding soil, but on the whole, the influence is very limited.