Andrew Crowe, engineering geologist for Halcrow evaluated the UAE's first rock driven tunnel. The Wadi Muddiq tunnel project saw a quantitative investigation, observation and evaluation of rock mass throughout construction. This allowed risks and uncertainties to be identified and managed effectively on the 110m2 elliptical, NATM excavated profile. Geology was basal oceanic crust of Upper Cretaceous age. It comprised a lithological sequence dominated by layered gabbro.
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