ABSTRACT
The New Tunnel Mainz had been constructed in the years 1998 to 2001 directly adjacent to the existing Old Tunnel Mainz.This old tunnel built in 1884 is currently being rehabilitated, converted and enlarged during the next years. Due to the small overburden of both tunnels and sensitive structures on the ground surface challenging and unique tunnelling techniques were chosen to guarantee the stability and serviceability of the tunnels and of sensitive structures. In addition calculation methods and results from geotechnical measurements are presented in the following. The situation of the tunnels is shown in figure 1.
