既有铁路列车运营对新建下穿隧道的振动影响

Vibration Influence of a Newly-built Undercrossing Tunnel Caused by the Operation of an Existing Railway Train

以在建的某城际铁路暗挖隧道段下穿既有铁路线路为工程背景,对既有铁路列车运营对下穿隧道的振动影响展开研究,得到如下结论:因施工前对既有铁路线路采取的预加固措施及对既有铁路的运行速度的限制,有效减小了既有铁路运营对新建隧道带来的影响,列车动荷载引起的隧道内力及变形并不显著,不需要单独进行加固措施设计。

This paper takes an intercity railway where a sub-surface excavated tunnel passes through an existing railway line as the background, the influence of the operation of an existing railway train on the vibration of the undercrossing tunnel is studied. The following conclusions can be concluded： since the pre-reinforcement measures taken for the existing railway lines before construction and its limitation on the running speed of the existing railway, the influence of the operation of an existing railway on a newly-built tunnel is greatly reduced. The internal force and deformation of the tunnel caused by the dynamic loads of the train are not significant, which means there is no need to especially design the reinforcement measures.