高速铁路路基不均匀沉降对胶黏道砟道床过渡段的影响研究

Research on the Influence of Uneven Settlement of High-speed Railway Subgrade on Transition Section of Adhesive Ballast Bed

以中兰客专某车站为例,采用ABAQUS有限元软件建立胶黏道砟道床过渡段的车辆-轨道-路基空间耦合模型,分析列车双向行驶时不平顺激励下折角沉降差异值的影响规律。研究结果表明:折角沉降差异值增大时,列车从无砟轨道至有砟轨道钢轨垂向振动位移与轮轨力增大幅度明显大于反向行驶;上行和下行钢轨垂向位移最大峰值点均处在折角沉降起点9m的位置,而车体垂向加速度、轮轨垂向力上行和下行其峰值点位置均不相同。

Taking a station on Yinchuan—Lanzhou high-speed railway as an example,the ABAQUS finite element software is used to establish a vehicle track subgrade spatial coupling model of transition section of adhesive ballast bed,and the influence law of differential value of angular settlement under uneven excitation of two-way running of the train is analyzed.The results of the research show that:when the differential value of angular settlement increases,the vertical vibration displacement of rail and wheel/rail force increase significantly from ballastless track to ballasted track.The maximum peak point of vertical displacement of up and down rails is at 9 m from the starting point of angular settlement,while the peak point positions of vertical acceleration of vehicle body and vertical force of wheel/rail are different from each other.