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Value engineering studies on the structural design and ventilation design; specification and on-site inspection services.
September 01, 1990
December 30, 1994
330 W Broadway St # 264
Tennessee, KY 40601United States
Twin tube highway tunnels, 12 m x 9 m x 1249 m long. Constructed using NATM support categories Type I through IV. Remedial waterproofing system installed between shotcrete linng and final cast-in-place concrete lining.
Quartz sandstone, siltstone, shale, mudstone (natural caverns).
|Bid cost:||Final cost:||
$85 million USD
The Cumberland Gap Tunnels are two dual-lane highway tunnels with a length of 1300m each, connecting Kentucky and Tennessee through the Cumberland Mountains. Because of the complex, variable geology and economic considerations, the New Austrian Tunneling Method (NATM) was chosen. The tunnel design included five excavation and support classes with rock dowels, lattice girders and reinforced shotcrete as primary lining. The final lining for the twin tunnels and 13 cross passageways was designed as cast-in-place (CIP) concrete with a flexible membrane waterproofing system.