Main Menu

You are here

Bergen Tunnel Rehabilitation

Geotechnical investigation, structural computations, preliminary rehabilitation design and supervision of rehabilitation works.
Estimated cost:
May 25, 2001
Completion date:
October 17, 2002
Jersey City
Jersey City, NJ 07304
United States
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.

Geology description:

Moderately close to closely jointed and fractured diabase; light gray to dark gray, very hard with moderate water infiltration.

Bid cost: Final cost:
$56 million USD
Service areas:

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.

Installation of membrane waterproofing system
Rehabilitated tunnel with final cast-in-place lining
Before Rehabilitation - East Tunnel
Portal Slope Stabilization
Typical Cross Section
Results of initial Blast to remove Brick Lining
Void Reinforcement
Shotcrete Robot
Final Lining Form and exposed Waterproofing System
Lettice Shotcrete
Existing bricklining
Before shotcreting
Side drain
Unsupported rock portal
Shotcrete portal
Shotcrete lining
Unsupported Tunnel wall
complete shotcreting
Complete shotcrete
Installtion of spiles
complete installation