轨道参数变化对无缝线路稳定性影响

Effect of Parametric Variation on CWR Track Stability

通过建立无缝线路轨道胀轨臌曲理论模型,分析无缝线路胀轨时的位移变化规律,研究温度力作用下无缝线路轨道臌曲的变化特征以及轨道参数对其的影响。轨道结构存在着稳定区、胀轨可能发生区、胀轨发生区以及反映臌曲变化特征的胀轨临界轨温点和安全临界轨温点。研究结果表明:理论模拟与试验结果有着比较好的一致性和吻合性;随着轨道扭曲刚度的增加,胀轨临界轨温和安全临界轨温均相应增加,且对安全临界轨温的影响幅度更大;轨道竖向刚度则对胀轨临界轨温的影响大于对安全临界轨温的影响。轨道纵向阻力对轨道的胀轨临界轨温影响不明显;随着轨道横向阻力增大,胀轨临界轨温增加的幅度要大于安全临界轨温增加的幅度。因此,保持轨道有较高的横向阻力对防止轨道臌曲极为重要,尤其在曲线轨道上更为突出。

By establishing CWR track buckling theoretical model, the displacement regularity of CWR track buckling is analyzed. The change characteristics of CWR track buckling under the action of temperature force and the effect of track parameters are studied. In the track structure, there are stable zone, track buckling potential zone, track buckling zone, the critical buckling temperature point and the critical safety temperature points reflecting the change characteristics of track buckling. Study results show that the theoretical simulation results are in good consistency and accordance with experiment results. The critical buckling temperature and critical safety temperature will increase with the increase of track torsional rigidity, and the increase of critical safety temperature is more obvious. The critical buckling temperature is more sensitive to the vertical rigidity of track than the critical safety temperature. The impact of the longitudinal resistance on the critical buckling temperature is not obvious. The critical buckling temperature will increase more obviously than the critical safety temperature along with the increase of the lateral resistance of track. Therefore, it is important to maintain a higher lateral resistance to avoid buckling, especially for curved track.