Rehabilitation of Rail Tunnels with Widening the Cross-Section While Maintaining the Regular Rail Traffic

摘要

This paper deals with the renewal of existing railroad tunnels while maintaining the running railroad traffic. Due to technical reasons of modernization, in Germany many new tunneling projects as well as reconstruction of existing tunnels are underway at present. Depending on tunnel conditions and traffic density, two different construction methods may be applied. In stable ground with moderate rail traffic, the tunnel may be renewed while maintaining the traffic flow. Alternatively a new tunnel may be built next to the existing one. Different methods of ground investigation and design of the tunnel lining for reconstruction of existing tunnels are described.