Research purposes:The speed of Zhengzhou-Xi'an Passenger Dedicated Line is 350 km/h，when the train passes 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 on the two open cut tunnels' connection engineering of Zhengzhou-Xi'an passenger Dedicated Line is to ensure the stability of 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 nearest distance between the entrance of two tunnels is less than 50 m , we suggest that the two should be connected by open cut tunnel. The open cut tunnel is a good technology which has been used in the place of Sanmenxia loess tunnels group and has achieved good results. (2)The technology that needn’t 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 should promote the use of it.(3)The results of the research can be promoted and used when increasing open cut tunnel on operating routes.
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