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Guidelines on Contractual Aspects of Conventional Tunnelling

Underground construction is clearly different from any other type of construction since the properties of the construction material – the ground conditions – cannot be precisely known. Unforeseen conditions, dependency on the means and methods, and unavoidable construction risks are typical for underground construction in general, and specifically for conventional tunnelling. contracting practices for tunnels and underground structures must therefore be dealt with differently from other types of construction.

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