摘要
随着上下交叉隧道的增加,为确保下部隧道的结构安全,应开展上部隧道运营期间车载作用对下方隧道结构的影响研究。结合凤潭隧道上穿输水隧洞工程实际,建立了上下交叉隧道三维数值模型。并进行动力学分析计算,获得公路隧道运营期间车辆荷载作用对下方输水隧洞不同时刻的振速、振幅、位移及应力云图。研究结果表明:凤潭隧道左右线隧道会车时,车载作用对下方输水隧洞的影响较大,产生较大的竖向振动,出现最大应力、振幅及振速;车载作用下输水隧洞的振幅分布较均匀,振动为整体振动。凤潭隧道运营期间车载作用对下部的输水隧洞所产生的应力和振动值均小于安全允许值,满足安全要求。
More and more cross tunnels are coming forth in China,and it is quite necessary to study the influence of the structure of the lower tunnel on the vehicle loads of the upper tunnel for the research reasonable construction methods for the safety of the lower tunnel.Based on the project of Fengtan highway tunnel passing through upon a water supply tunnel,a numerical simulation was conducted to evaluate the influence of the structure of the lower tunnel on the vehicle loads of the upper tunnel.The dynamic response and analysis of the structure of the lower tunnel on the vehicle loads of the upper tunnel were conducted.The stress nephogram,displacement nephogram,amplitude nephogram and vibration velocity nephogram of the water supply tunnel on the vehicle loads of the upper highway tunnel were obtained,respectively.The results show that the maximum value of the amplitude,vibration velocity and displacement of the water supply tunnel under vehicle loads usually appear when two vehicles meet on double upper highway tunnels.The amplitude distribution of the water supply tunnel under vehicle loads is even,and it is the overall vibration.The values of stress and vibration of the structure of the lower water supply tunnel on the vehicle loads of the Fengtan tunnel,are no more than the security allowed values.It meets the safety requirements.
出处
《交通科学与工程》
2017年第2期43-50,共8页
Journal of Transport Science and Engineering
