Different challenging tunnel projects in the downtown area of the city of Mainz in Germanyare presented. These tunnels run parallel in a distance of 4m to max. 50 m. The tunnels were built in soft soilconditions consisting of filling, clay and marl layers of the Tertiary. The paper presents the different constructiontechniques, the calculation methods for the two tunnels as well as the results of measurements for the NewTunnel Mainz. The experience for the construction of this tunnel and the results of the measurements were thebasis for the chosen construction and calculation method for the rehabilitation of the Old Tunnel Mainz, whichis currently under construction.
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