THE BLANKA TUNNEL The Blanka complex of tunnels in Prague is currently the largest underground construction project in the Czech Republic. It is being built within the development of the north-western part of the inner city orbital road. The extension of the works is extraordinary, the total length of this section is 6,4 km. After its completion it will join up with the already existing 17 km of the city circle. The whole project consists of several successive tunnel sections, bothmined and „cut and covered“. The „cut-and-cover“ tunnels are constructed by 2 methods. Firstly the „bottomup method“ where a trench is excavated and the tunnel is constructed within, starting from the bottom slab followed by the walls and the roof. Limitations of urban area conditions where early reinstatement of

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