Design and Experimental Study of Ballastless Track with Large Adjustment in Active Fault Zone
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.
active fault zoneballastless tracklarge adjustmentstructural parameters optimizationfatigue test
NETL
NSTL
万方数据
