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Hard rock

Bluewater Quarry Haulage Tunnels

Service Performed
Detailed design and construction supervision
Commencement - Services
October 24, 1995
Completion - Services
November 29, 1995
Location
Nr. Dartford
Kent
United Kingdom
Technical data

Twin tunnels, 26 ft (8 m) span, length: 246 ft (75 m); 8 inch (200 mm) reinforced single pass shotcrete lining, 10 year design life.

Geology description

Head deposits overlying upper Chalk. Grades III/II at tunnel elevation.

Geology types
Hard rock
Final cost
$500,000

Cumberland Gap Tunnels

Service Performed
Value engineering studies on the structural design and ventilation design; specification and on-site inspection services.
Commencement - Services
September 01, 1990
Completion - Services
December 30, 1994
Location
330 W Broadway St # 264
Tennessee, KY 40601
United States
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.

Geology description

Quartz sandstone, siltstone, shale, mudstone (natural caverns).

Geology types
Hard rock
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.

Activity
Final cost
$85,000,000
Project number
091E
Final cost
$85 million USD

Lehigh Tunnels

Service Performed
NATM design, instrumentation and construction supervision services; waterproofing system design and rehabilitation support services.
Commencement - Services
March 25, 1987
Completion - Services
December 25, 1991
Location
Route 283, Eisenhower Blvd
Allentown, PA 17034
United States
Technical data

New highway tunnel, two lanes, 28 ft (8.5 m) x 40 ft (12.1 m) x 4,265 ft (1300 m). Constructed using NATM with drill and blast excavation measures. Installation of PVC membrane and thermal insulation in air duct of the 50 year old, two lane road tunnel during rehabilitation. Tunnel lenght: 4,138 ft (1260 m); waterproofed area: 117,000 sqft (10870 m²).

Geology description

Sandstone, shale, siltstone.

Geology types
Hard rock
Description

The Lehigh Tunnel No.2, part of a 4-lane motorway running East-West through Pennsylvania, was one of the first tunnels in the US built using NATM. Capacity problems of Lehigh Tunnel No.1 caused delays during peak times. The new tunnel was excavated using top heading, bench and invert excavation with shotcrete support. To achieve a completely dry tunnel a PVC membrane was installed between primary shotcrete lining and the final cast-in-place lining. Tunnel rehabilitation including the installation of a PVC membrane and thermal insulation in the air duct was performed to the original tunnel.

Activity
Final cost
$25,000,000
Project number
115D
Final cost
$25 million USD

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