The Santiago Metro is currently the largest metro system in South America with more than 100 Km (62 miles) of lines and 108 stations operating on 5 lines and providing service for more than 2 million passengers daily. Construction of Lines 3 and 6 serve to further expand access to the metro for the 7.3 million inhabitants of the Santiago Metropolitan area.
Metro engaged Gall Zeidler Consultants (GZ) as technical expert specialized in tunnel design, consulting construction support and construction management. GZ’s scope of work included review of the tunnel design as well as select construction documentation provided by Metro. The scope of work is limited to subsections 1 and 2 of the Line 3 project. GZ was tasked with analyzing adequacy of the NATM design and construction methodology portrayed for the ground conditions anticipated, and assessing the contractor’s proposal, particularly in view of constructability and proposed progress rates.
Subsectors 1 & 2: SEM Light Rail Tunnel, SEM stations
Subsectors 1 & 2:
Running Tunnels: 3.3 miles (5.3 km)
Stations: 394 ft (~120 m)
55 ft (16.8 m) width
36.4 ft (11.1 m) height
32.5 – 38 ft (9.9 – 11.66 m) width
23.8 – 31.8 ft (7.26 – 9.69 m) height
Fill, sandy gravels, sandy gravels with clays, clays and silts
Approx. USD $92 Million