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September 2015
Volume 67    Issue 9

Lake Mead intake No. 3: TBM tunneling at high pressure

Mining Engineering, 2015, Vol. 67, No. 9, pp. 135-135
Nickerson, Jim; Bono, Roberto; Cimiotti, Claudio; Moonin, Erika


PREVIEW:

In response to the severe drought on the Colorado River basin and in order to preserve existing water capacity to the Las Vegas Valley, the Southern Nevada Water Authority contracted a new deep-water intake (Intake No. 3) located in Lake Mead. The current project (Contract No. 070F-01-C1) includes 5 km (3 miles) of tunnel with very difficult geological conditions and a 200-m (650-ft) deep shaft and marine works. This paper will present the current status of the design-build contract being constructed by Vegas Tunnel Constructors and the challenges and problems faced and the innovative solutions developed to handle the difficult conditions encountered during tunneling with up to 15 bars of pressure.



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