GCG were required to provide advice on various tunnelling issues, including the effects of the geological conditions, selection of tunnel boring machines, settlement analyses, construction of tunnel boxes, shafts and cross passages, use of ground treatment, and tunnel lining design. GCG reviewed all the documentation provided by the project’s Joint Venture in support of their proposal, identifying issues and areas where further information was required, along with potential ‘show stopper’ issues that required resolution before the scheme could be allowed to proceed. The most important of the last of these involved the advance identification of voids and cavities and the ground treatment needed to deal with these ahead of tunnelling.
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