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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。
Through the establishment of the theoretical model of the orbital expansion of the seamless track, the displacement variation of the seamless track during the expansion is analyzed. The variation characteristics of the track curvature under the action of the temperature force and the influence of orbital parameters on it are studied. The orbital structure has the stability zone, the possible area of the expansion joint, the area of the expansion joint and the critical temperature point of the expansion trajectory and the critical temperature point of the critical trajectory that reflect the variation of the curvature. The results show that the theoretical simulation and experimental results have good consistency and coincidence. With the increase of track torsional stiffness, the critical orbital temperature and critical critical temperature of the expansion rail increase correspondingly, and the impact on safety critical temperature is more Large; the vertical stiffness of the track has more influence on the critical rail temperature of the expansion rail than on the critical rail temperature. The longitudinal rail resistance has no obvious effect on the critical orbital temperature of the rail expansion trajectory. As the rail lateral resistance increases, the critical rail temperature increase of the rail expansion is greater than the increase of the safety critical rail temperature. Therefore, keeping track of high lateral resistance is very important for preventing orbital curvature, especially on curved orbits.