Abstract
Abstract In order to provide a sufficient water supply for the fast growing population of the Las Vegas, Nevada valley, the Southern Nevada Water Authority was forced to quickly design and build a parallel system to transport water from Lake Mead. The key element of the overall 15-project upgrade program was the construction of a 6,070m (20,000 ft.) long, 3.6m (12-ft.) diameter concrete-lined tunnel through the River Mountains. The tunnel was driven by an upgraded Tunnel Boring Machine (TBM) through Agglomerate, Rhyolite, Rhyodacite and Conglomerate. This Paper discusses several actions that were taken by the owner, engineer and contractor to build this tunnel in a remarkably short period of time. Also discussed are TBM and concrete lining performance and predicated and encountered ground conditions.
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