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    Bologna Tunnels

    The project comprises two 6.1-km tunnels for which two Earth Pressure Balance tunnel boring machines of 9.4-m diameter were used. The excavation of the tunnels in an intensely urbanized context and the heterogeneous ground conditions required a particular methodology in order to minimize the effect on the existing structures and facilities on the surface. 

    This project featured the world’s first experiment with earth-consolidating injections and compensation with guided boring along a curved line. Other innovations included metal rings with doors for connecting galleries, designed by ACCIONA Engineering.

    General Information

    Bologna, Italy
    Contract type
    Design and construction
    Two 6.1 km-tunnels for which two EPB tunnel boring machines with a 9.4-m diameter were used
    Year of project completion

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