长大坡度地段有砟轨道道床阻力分布及影响研究

针对在长大坡道地段有砟轨道道床阻力及线路稳定性问题，通过离散元法模拟了III型混凝土轨枕在无动荷载时不同坡度下有砟道床的阻力值，以道床阻力精确值为媒介导入有限元中，施加温度荷载对轨排结构稳定性进行分析。研究表明:受轨枕与道床间正压力减小及道床整体性减弱影响，随坡度不断增大，道床纵、横向阻力明显减小；道床阻力对轨枕横向位移影响明显，无缝线路轨排结构保持自身稳定性的能力减弱；且随着坡度增大，道床阻力和允许温升的降幅越来越快。

Research on Resistance Distribution and Influence of Ballasted Track Bed in Long Slope Section

Aimming at the resistance of the ballasted track bed and the stability of the track in the super-large ramp section, the paper firstly simulates the resistance value of the type III concrete sleeper with the ballast bed under different slopes through the discrete element method when there is no dynamic load, then uses the accurate value of the ballast bed resistance to import the finite element and apply temperature load to analyze the stability of the rail row structure. Studies have shown that: affected by the reduction of the positive pressure between the sleeper and the track bed and the weakening of the integrity of the track bed, as the slope continues to increase, the longitudinal and lateral resistance of the track bed is significantly reduced; the resistance of the track bed has a significant effect on the lateral displacement of the sleeper and the ability of seamless track rail structure to maintain its own stability is weakened, and as the slope increases, the resistance of the track bed and the decreasing amplitude for allowable temperature rise is faster and faster.