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Bergen Tunnel Rehabilitation
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| Service: | Geotechnical investigation, structural computations, preliminary rehabilitation design and supervision of rehabilitation works.
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| Estimated cost: | $56,000,000
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Commencement: | May 25, 2001
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Completion date: | October 17, 2002
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| Location: | Jersey City Jersey City, NJ 07304 United States |
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| Technical data: | Widening of a 4,300 ft (1310 m) long, 25 ft (7.6 m) wide double track, partially brick-lined railway tunnel built in the late 1800s. Excavation and support according to the principles of NATM with two support types. Flexible membrane waterproofing and cast in place final lining. |
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| Geology description: | Moderately close to closely jointed and fractured diabase; light gray to dark gray, very hard with moderate water infiltration. |
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| Bid cost: | Final cost: | $56 million USD
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Description
The Bergen Tunnel on the New Jersey Transit network is a double track, horseshoe shaped rail tunnel, built in the 1870s, passing through fractured diabase. Over time, water ingress has caused operational problems. In 2000 the owner decided to undertake major structural rehabilitation. The brick lining was stripped out and the original profile was enlarged to take a new reinforced in-situ concrete lining and drainage system. Old ventilation shafts were backfilled. Two large openings were retained for tunnel ventilation, emergency access and to house new power and electrical substations.
