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Rural Water Tunnel

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
Categories
Rural Water Tunnel
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
Categories
Rural Water Tunnel
Service areas

Brighton Storm Water Relief Scheme

Service Performed
NATM design of the shaft bottom, TBM chamber, mucking bunker and backshunt
Commencement - Services
June 27, 1993
Completion - Services
November 27, 1993
Location
Brighton
United Kingdom
Technical data

11.6 m diameter shaft, approx. 45 m deep. Concrete segmental construction to 24.95 m OD. NATM construction to the base at -43.25 m OD with a 7.5 m span TBM launch chamber and mucking bunker, 40 m long, and 4.0 m diameter backshunt adit, 13.5 m long.

Geology description

Made Ground overlying Marine Gravels overlying upper Chalk. The NATM shaft and adits were excavated within the Upper Chalk which had numerous flint bands. Seawater was consistently flowing trough the joints and flint bands.

Geology types
Categories
Rural Water Tunnel
Final cost
$500,000
Longitudinal Section and Cross Section
TBM in Launch Shaft

Godar-E-Landar, Hydro Electric Power Scheme

Service Performed
Consultant
Commencement - Services
December 30, 1992
Completion - Services
December 30, 1993
Location
Iran
Technical data

Hydro Electric Power Scheme. Diversion Works: 2 tunnels (1 km each). Outlet and Intake open cut slopes and bottom outlet shaft.

Geology description

Slope debris, Conglomerate, Siltstone, Sandstone.

Description

A immediate shotcrete sealing degrease tendency of deterioration.

Categories
Rural Water Tunnel
Landscape of the shotcrete portal area
Cross section, excavation & support completed
FEM Calculation Sequences
Top Heading Bench Excavation
Polar Visualization of Outlet and Intake Slopes

Yacambu-Quibor-Tunnel

Service Performed
Advice and Recommendations for Experimental Investigation Section.
Commencement - Services
November 30, 1990
Completion - Services
December 31, 1991
Location
Venezuela
Technical data

24.4 km long transfer tunnel, 4.2 m diameter.

Geology description

Phyllite, Sandstone.

Description

L= 24.368 m Water diversion tunnel TBM drive was stopped due to high rock pressure. One TBM got stuck and was lost.

Categories
Rural Water Tunnel

Ilarion Hydroelectric Project (160 MW)

Service Performed
Member of board of consultants
Commencement - Services
October 29, 1990
Completion - Services
December 29, 1995
Location
Athens
Greece
Technical data

Earth dam, two inclined spillway shafts and tunnels (12 m ID, inclined length 140 m, horizontal length 550 m), diversion tunnel (500 m long), power tunnel (8,5 m ID, 480 m long), surface power house and 3 km long grouting tunnel.

Geology description

Slope wash, Limestone, Siltstone, Sandstone, Shale, Cherts.

Categories
Rural Water Tunnel
General Layout (Public Power Corp.)
Sections through Tunnels (Public Power Corp.)
Robbins 6.6 m diameter TBM - partly erected

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
Categories
Rural Water Tunnel
Final cost
$26,000,000