![]() Mott MacDonald has extensive experience in the evaluation of the right type of TBM for the project, whether contractor-selected or owner-specified. Often, tunnel boring machines (TBMs) are the most efficient means of excavation. We have engineered linings consisting of cast in place concrete, precast concrete, troweled shotcrete, embedded or prestressed concrete cylinder pipe, steel pipe, or no lining at all. Depending on the ground conditions and internal and external hydraulic pressures, our tunneling team will evaluate the need for a tunnel lining, and if so, what type. The breadth of our world-wide experience is brought to bear on every water conveyance tunnel project, no matter how small or large the assignment.įrom the hardest rock to the softest clay conditions, beneath cities, rivers, oceans, or mountains, our extensive experience allows us to effectively identify the most appropriate tunneling technology. We appreciate the significance of these complex issues. ![]() Mott MacDonald has engineered some of the longest and most challenging water conveyance tunnel projects in the world.
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