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Metro de Santiago, Linea 2 South Extension, Lo Ovalle to La Cisterna

Owner:
Client:
Service:
NATM design support services and on-site monitoring.
Estimated cost: Commencement:
January 30, 2001
Completion date:
December 30, 2004
Location:
Av. Libertador Bernardo O'Higgins 1414
Santiago
Chile
Technical data:

2.5 km Dual Track Running Tunnels and two Stations with a maximum span of 16.2 m. Excavation of 60-65 m² running tunnel in combined top heading/bench with a subsequent invert excavation. Reinforcement consists of lattice griders and welded wire fabric for initial lining and welded wire fabric for final shotcrete lining.

Geology description:

Ripio de Santiago (quaternary conglomerate) consists of a stable matrix of smooth rounded rocks held by bonding fines. Due to earthquake activity it gained compaction and interlocking.

Geology types:
Activity:
Categories:
Bid cost: Final cost:
$29.6 million USD
Service areas:
Construction methods:
Description

The Santiago Metro network comprises five lines. The Linea 2 South extension included 2.5km dual track running tunnels and two stations with a maximum span of 16.2m. Further, an excavation of 60-65m2 running tunnel in combined top heading/bench with a subsequent invert excavation. Reinforcement consisted of lattice girders, welded wire fabric for initial lining and welded wire fabric for final shotcrete lining. Dr. Sauer and Partners assisted in the production of design criteria for the final design and produced finite element structural computations for the large station caverns.

Excavations of topheading
Shaft and portal
Side drifts, Junction station running tunnel
First side drift
Installation of lattice girder and wire mesh
Headwall
Start-up of sidewall drift
Kurt Egger
Reinforcement of headwall
Compact sand and gravel
Support beam
El Parron South
El Parron South
Sidewall drift
Face support earth wedge located in the top heading
Stress meter
Stress meter
Gerstgrasser Otto
Gerstgrasser Otto
Brunner W.
Dr.Sauer & Gerstgrasser Otto
FEM-Model of Access Tunnel - Station Tunnel Junction
Sidewall Drift Portal
Shotcrete Application
Breakout from Tunnel
Excavation of Center Drift
Demolition of Temporary Sidewall
Mucking out through Access Shaft
Linea 5 - Junction Station-Tunnel
Installation of Tracks
Completion of Electrical Installations in Station
Linea 5 - Finished Station
Excavation of invert