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Big Walker Tunnel - Rehabilitation

Service Performed
Rehabilitation design services
Commencement - Services
February 22, 2001
Completion - Services
October 17, 2001
Location
Richmond, VA
United States
Technical data

2 two-lane highway tunnels constructed in 1971. Length: 4229 ft (1289 m) each; cross section: 907 sqft (84 m²). Design of remedial waterproofing and diversion system installed in air ducts and on vertical walls. Project focused on minimizing vehicular flow disruptions and lane closures.

Geology description

Brown Shale

Geology types
Hard rock
Final cost
$7,500,000
Big Walker Tunnel Portal
East River Mountain Tunnel Portal
Damaged Tunnel Lining
Water Ingress Damage to Tunnel Lining
Concrete Corrosion at Side Air Conduits and Tunnel Sidewall Drains
Rehabilitation Cross Section
Detail of Waterproofing System
East River Mountain Tunnel
Tunnel Portal
Water Ingress in Air Duct

Exchange Place Station - PATH Line Improvements

Service Performed
Tunnel excavation and lattice girder geometries and layout
Commencement - Services
October 19, 2002
Completion - Services
October 19, 2003
Location
Jersey City, NJ
United States
Technical data

Station platform expansion and track crossover reconfiguration for PATH Lines at Exchange Place Station; re-mining of running tunnels and crossovers. Excavation in Manhattan Schist with road headers and support of caverns with rock bolts, lattice girders and fiber reinforced shotcrete.

Geology description

Heavy foliated gneiss, schist, schistose gneiss with pegmatite intrusions occasional amphibolite; Transitional (Slope/Rise) Rock.

Geology types
Hard rock
Description

Exchange Place station on the Port Authority Trans-Hudson (PATH) commuter rail service between New York and New Jersey. After the collapse of the World Trade Center, Exchange Place station and the river crossing running tunnels were closed. Two 16 ft (5 m) long concrete plugs were installed at the Exchange Place end of the under river tunnels to prevent flooding of the subway system as a result of water flowing from broken water mains and sewer lines and generated by extensive fire fighting efforts at Ground Zero. Excavated in the mica schist of the New York / New Jersey region, the station complex comprises a set of five roughly parallel tunnels. Turning the existing elements into a terminus and extending the platform tunnels a further 150 ft (45 m) involves excavating new crossovers, modifying the profile of the existing tunnels, raise the invert and crown in others up to 9 ft (3 m) and back filling unneeded tunnel spaces to create the ground in which new spaces can be excavated. Only man access was available through the elevator facilities at the closed Exchange Place station, material had to be carried out by specially equipped work trains about 4 miles (6.5 km) west to the underground station to the surface staging areas. To re-open this important element of infrastructure - PATH provided a daily average of 260,000 passengers trips prior to September 11, 2001 - as soon as possible the whole project was finished in about 24 month.

Final cost
$25,000,000
Plan Layout of PATH Line Improvement and Widening
3D Model of Crossovers
Breakout from exisiting Tunnel
Lining Demolition at Tunnel Widening
Road Header
Road Heading Excavation
Crossover under Construction
View from Station Platform to Crossovers
Completed Crossover

Lonquimai Tunnel

Service Performed
Rehabilitation design
Commencement - Services
October 22, 2001
Completion - Services
October 22, 2003
Location
Temuco
Chile
Technical data

The 4500 m (14,760 ft) long Lonquimai Tunnel is a one lane, concrete lined road tunnel. The rehabilitation design foresees to line 3500 m (11,500 ft) of the tunnel with a flexible waterproofing membrane protected by a 5 cm (2 inch) thick shotcrete shell and the installation of a new drainage system.

Geology description

Hard rock

Geology types
Hard rock
Final cost
$1,800,000
Tunnel Portal
Existing Tunnel Condition
Deterioration by Water Inflow

Pressure Tunnel Ralco

Owner
Service Performed
NATM design and application support
Commencement - Services
June 29, 2001
Completion - Services
December 30, 2004
Location
Alto Bio-Bio
Chile
Technical data

Pressure tunnel with a lenght of 7 km (4.3 mi) and a diameter of 10 m (32.8 ft). Excavation in full face, top heading and invert according to encountered rock conditions. Initial support with lattice girders, steel fiber reinforced shotcrete and rock bolts. Grouting pipe spiling as pre-support for areas with deteriorated rock.

Geology description

Volcanic rock and tertiary sediments; lavas and lavas brechosas andesitas, lavas con niveles de conglomerados finos y arenisacas. Rock intrusions in the form of diorite and diabase.

Geology types
Hard rock
Categories
Final cost
$50,000,000
Cross Section with Excavation Steps
Construction Site - Dam in Background
Power Tunnel Outlet
Excavation of Invert
Installation of Shotcrete Lining at Tunnel Invert

Water Tunnel - Cochabamba

Client
Service Performed
Assessment of Risk Associated with Tunneling Works and Recommendation for Risk Management
Commencement - Services
February 27, 1998
Completion - Services
October 22, 2003
Location
Cochabamba
Bolivia
Technical data

2 x 3 m diameter water tunnels (7.5 and 13.2 km long). More than 1000 m overburden.

Geology description

Sandstones, Limestones, Claystones, highly disturbed with many fault zones. High water table.

Geology types
Hard rock
Categories
Service areas

Thissavros Dam Project

Service Performed
NATM Consultant for Underground Excavation and Support.
Commencement - Services
October 30, 1990
Completion - Services
December 30, 1990
Location
Athens
Greece
Technical data

Power generation complex including power house cavern, shaft, tunnels and galleries etc.

Geology description

Gneiss (areas of small faults, tectonised rock or rock crossed by a dense network of pegmatite and aplite veins).

Geology types
Hard rock
Categories

Power Station Gallery, Leitzach

Client
Commencement - Services
July 30, 1978
Completion - Services
February 28, 1980
Location
Munich , Bavaria
Germany
Technical data

Power tunnel, lenght: 2300 m, diameter: 4 m, intake and intermediate shafts. Powerhouse, 20 m by 15 m in cross section, approx. 30 m deep.

Geology description

Weathered rock: soft sandstone and marl, talus material.

Geology types
Hard rock
Categories
Final cost
$26,000,000

Rauheberg-Tunnel NBS (new high-speed railway line) Hannover to Wuerzburg

Service Performed
NATM design and instrumentation
Commencement - Services
June 29, 1983
Completion - Services
December 30, 1988
Location
Hannover , Lower Saxony
Germany
Technical data

Twin track railway tunnel, length 5.21 km (3.23 miles), full section of 140 m² approx. Excavation method: NATM, top heading, bench and invert.

Geology description

Lower shell limestone, higher bunter sandstone: clay and sandstone layers, high groundwater inflows of 400 l/s at the interface between the limestone and sandstone encountered.

Geology types
Hard rock
Categories
Final cost
$100,000,000
Groundwater Control

High Speed Rail Hannover to Wuerzburg

Service Performed
Consultant for Tunnel Design
Commencement - Services
June 24, 1980
Completion - Services
January 06, 1989
Location
Frankfurt/Main
Germany
Technical data

New high-speed rail section of 20 km length, including 5 tunnels. Total length of tunnel works is 8 km.

Geology description

Laminated rock, claystone and sandstone.

Geology types
Hard rock
Categories
Final cost
$120,000,000
Typical Twin Track Tunnel Cross Section
Typical Twin Track Tunnel

Phase II - Allegheny Tunnel Traffic Relief Study

Service Performed
Preliminary tunnel improvement study including alignment and tunnel design
Commencement - Services
February 28, 1998
Completion - Services
December 30, 1998
Location
Allegheny, PA
United States
Technical data

Preliminary alignment study looking at four new tunnel options and rehabilitation of the existing tunnels. Design of two to four lane highway tunnels up to 6100 ft (1860 m) in length supported with rockbolts, reinforced shotcrete and lattice griders.

Geology description

Interbedded Shales and Sandstones with Limestone interbeds, Coal and Claystones. Decomposed to highly weathered fractured rock at the tunnel portals.

Geology types
Hard rock
Activity
Plan showing the existing topography, roads and streams along with the four Alignment Options
Profile showing the existing topography along the Red Alignment Option - Westbound Tunnel

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