Santiago Metro Line 6

Metro de Santiago

Metro Line 6 Constructability Review and Evaluation:

Metro de Santiago is currently developing the design of Lines 3 and 6, which cover and area of roughly 15.6 kilometers (9.7 miles) across seven districts of Santiago. Line 6 links Avenida Pedro Aguirre Cerda near the former Los Cerrillos Airport to the planned station of Vitacura in the municipality of the same name. The excavation and support of these tunnels are generally based on the used of the New Austrian Tunneling Method (NATM). However, there have been proposals to adjust the excavation and support methods in order to improve efficiency and lessen overall construction time. One alternative involved the so-called “Self-supporting Vault” (SSV) method and includes the installation of a pipe arch umbrella as systematic pre-support. This option is envisioned for the construction of the station tunnels.

Gall Zeidler Consultants (GZ) was retained as an expert consultant to review and evaluate the constructability of the SSV method for Line 6 station tunnels, as well as a structural analysis of the interstation tunnels. Further, GZ also performed an independent quantitative evaluation using 2D FEM analysis.

LOCATION:
Santiago, Chile
DATE:
2012 – Present
STRUCTURE:
Inter-station Tunnels, 12 Station Tunnels
LENGTH:
Inter-station Tunnels: 12 kilometers (8 miles); Station Tunnels: 1.6 kilometers (1 mile)
CROSS-SECTION:
Station Tunnels with 4-meter Platform: 154 square meters (1,658 square feet); Station Tunnels with 5-meter Platform: 163 square meters (1,755 square feet)
GEOLOGY:
Fill, Gravels, Sandy Gravels, Fine Silts and Silty Clays (Alluvial); Groundwater located below depth of 25 meters
COST:
Approximately US $1.036 Million
CLIENT:
Metro de Santiago
OWNER:
Metro de Santiago