隧道洞口间明洞连接技术探讨

Exploration on the Connect Technology between the Two Open Cut Tunnels' Entrance

研究目的:郑西客运专线为350 km/h的客运专线,当列车以高速通过隧道时产生的空气动力学效应对行车、旅客舒适度、列车相关性能和洞口环境的不利影响十分明显。本文通过对郑西客运专线两处隧道间明洞连接工程的技术探讨,研究出一种能确保洞口土体稳定、行车安全、避免空气动力学效应对乘客舒适度的影响的适用于隧道洞口间的结构。研究结论:(1)高速铁路隧道洞口仰坡过高及隧道洞口间距离小于50 m时应接长明洞,桩基明洞是一种适宜的结构形式,已经应用于郑西客运专线三门峡黄土隧道群段,取得了很好的效果;(2)"免拆混凝土纤维板内模接长高速铁路既有线明洞施工"工法,较好地解决了既有高速铁路隧道洞口接长明洞施工,能保证线路运营安全;(3)该研究成果可在运营线路上增建明洞时推广使用。

Research purposes： The speed of Zhengzhou -Xi＇an Passenger Dedicated Line is 350 km/h, when the trainpasses through a tunnel at high speed, adverse influences of aerodynamics effect on train working, passenger comfort,train performance and the environment at the entrance of the tunnel are obvious. The purpose of the technology study onthe two open cut tunnels＇ connection engineering of Zhengzhou -Xi＇an passenger Dedicated Line is to ensure the stabilityof soil and traffic safety at the entrance, at the same time to avoid the aerodynamics effect influencing the passengers＇comfort.Research conclusions ： （ 1 ） When the entrance slope of these high speed railway tunnels is very high, and the nearestdistance between the entrance of two tunnels is less than 50 re,we suggest that the two should be connected by open cuttunnel. The open cut tunnel is a good technology which has been used in the place of Sanmenxia loess tunnels group andhas achieved good results. （2）The technology that neednt remove the concrete fiber template using in open cut tunnels＇of existing high speed railway has achieved good results. It can ensure the safe operation of the line and we shouldpromote the use of it. （3）The results of the research can be promoted and used when increasing open cut tunnel onoperating routes.