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The selection of the correct method of tunnelling from the contractor's point of view mostly depends on its chance to survive the competition of the marketplace, in addition to a host of technical constraints. The tendering and award conditions also decisively influence whether the technically and economically optimal solution is chosen.
There are also other factors like the market situation, availability...
In order to drive an underground tunnel, current technology offers plenty of methods. Only generally applicable statements can be made about the selection of a suitable method, as this depends on project‐specific conditions. In this article, three current methods of tunnelling are compared and their characteristics and potential are described in order to produce a system for the selection of the best...
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