【摘要】 文章对比分析有砟轨道及无砟轨道两种型式下,隧道基底围岩的振动响应规律。以车速为60km/h的C80型货运列车为激励荷载,考虑10t、15t、20t、25t、30t、35t六种轴重工况,建立三维动力有限元模型进行对比分析。结果表明:相同轴重时,两种轨道型式下隧道基底围岩加速度的衰减规律基本相同,无砟轨道的响应量级及随深度的衰减梯度均大于有砟轨道;随轴重的增加,两种工况下的基底振动响应均单调增加,无砟轨道工况的变化梯度大于有砟轨道工况;从列车振动影响角度考虑,在同等围岩等级地段修建重载铁路建议优先采用有砟轨道。更多还原

【Abstract】 In this paper,vibration influence on the basement rock of the freight railway tunnel is analyzed,using the ballast and the ballastless track. Taking C80 type freight train at 60 km/h speed as the exciting load,six axle load conditions of 10 t,15 t,20 t,25 t,30 t and 35 t are taken into account. Three-dimensional dynamic finite element models are established and the calculation results are contrasted. The results indicate that under the same axle load,the vibration attenuation law in the basement rock of different track is basically the same,furthermore,the vibration level and the attenuation gradient of the ballastless track are both greater than the other one. With the increase of axle load,the response of the basement rocks increases monotonically under two track systems,and the variation gradient of the ballastless track is larger than the other one. Considering the vibration influence induced by trains,it is recommended to adopt the ballasted track in the heavy haul railway at the same grade of surrounding rock.更多还原