活动断裂带大调整量无砟轨道设计与试验研究

Design and Experimental Study of Ballastless Track with Large Adjustment in Active Fault Zone

研究目的:为满足跨活动断裂带线路铺设无砟轨道需求,提升该地区无砟轨道的线路平顺性与舒适性,提出一种大调整量活动承轨台式无砟轨道。采用ANSYS有限元软件建立整体和轨枕局部有限元模型,分析活动承轨台式无砟轨道的受力特性,在此基础上进行大调整量无砟轨道结构参数优化研究以及疲劳试验研究,分析结构刚度、位移和应变变化情况。研究结论:(1)活动承轨台式无砟轨道在列车荷载与温度荷载叠加作用下,最大拉应力出现在轨枕位置,为3.47 MPa,各部件应力均满足强度要求且在轨枕尺寸和材料优化后进一步降低;(2)疲劳试验中随着疲劳加载次数增加,结构横、纵向刚度在疲劳前后变化分别为3.4%和24.2%,结构应变小幅增加,未见塑性变形与明显损伤;(3)仿真与试验结果可为活动断裂带地区无砟轨道设计提供参考和借鉴。

Research purposes:To meet the need for laying ballastless track across active fault zones and improve the smoothness and comfort of ballastless track in this area,a ballastless track with a large adjustable bearing table was proposed.The integral and local finite element models of the sleeper were established using ANSYS finite element software to analyze the mechanical characteristics of the track.Based on the analysis,the structural parameter optimization and fatigue test of ballastless track with large adjustment were carried out,and the changes of structural stiffness,displacement and strain were analyzed.Research conclusions:(1)Under the superposition of train load and temperature load,the maximum tensile stress at the sleeper position is 3.47 MPa,and the stress of each component meets the strength requirements and further decreases after the sleeper size and material optimization.(2)In the fatigue test,with the increase of fatigue loading times,the transverse and longitudinal stiffness of the structure before and after fatigue changes are 3.4%and 24.2%,respectively.The structural strain increases slightly,and no plastic deformation and obvious damage are found.(3)The simulation and test results can provide reference for the design of ballastless track in active fault zone.