Hartsfield- Jackson Atlanta International Airport is the world’s busiest airport and is currently undergoing a $6-billion capital improvement program, which includes the Plane Train Tunnel West Extension Project (PTTWE). The PTTWE project includes construction of a 900-ft long SEM tunnel and bifurcation that will extend the airport’s existing automated people mover system tunnel west from its existing endpoint. The extension will improve the train turn-back operation, reducing train headway and increasing passenger capacity.
Gall Zeidler Consultants (GZ) provided a formal constructability review of the respective Sequential Excavation Method (SEM) tunnel design packages, including an assessment of excavation sequencing, initial support, instrumentation and monitoring, and contingency measures. GZ has provided on-site support during construction of the SEM tunnels including the Senior SEM Engineer and SEM Superintendents.
Hartsfield-Jackson Atlanta International Airport, Atlanta, Georgia
2019 - Present
Automated People Mover System Tunnel Extension
900 ft (247 meters)
~20.5 ft height x 19 ft width
Fill, Residuum/Saprolite, Partially Weathered to Fresh Gneiss
Approximately $331 million
Clark/Atkinson/Technique (CAT) JV
City of Atlanta