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Cumberland Gap Tunnels
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| Service: | Value engineering studies on the structural design and ventilation design; specification and on-site inspection services.
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| Estimated cost: | Commencement: | September 01, 1990
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Completion date: | December 30, 1994
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| Location: | 330 W Broadway St # 264 Tennessee, KY 40601 United States |
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| Technical data: | 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. |
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| Geology description: | Quartz sandstone, siltstone, shale, mudstone (natural caverns). |
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| Bid cost: | Final cost: | $85 million USD
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Description
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.
