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Tunnel boring machines are particularly efficient if they can be used over longer distances and the geological conditions do not vary too much. In addition to efficiency, mechanized tunneling impresses with a high degree of automation.
In this case, support can be provided with segments (prefabricated concrete segments) directly after excavation, which in most cases also serve as internal support. Alternatively, in stable rock conditions, support can be provided by shotcrete.
Blasting and excavation are mostly used when the driving lengths are either small or the rock conditions are highly variable. Conventional tunneling is highly variable and can be adapted to the prevailing conditions at any time. In most cases, the inner lining of cast-in-place concrete is installed after the tunnel has been secured with shotcrete and anchors.