Project Experience

NATM/SEM Tunnels

Northeast Boundary Tunnel

Northeast Boundary Tunnel

Emad Iskander, Ph.D., PE performed the design review of slurry wall shafts, Sequential Excavation Method (SEM) adits connecting to the tunnel, and support of excavation for near-surface structures. The century-old combined sewer system in the District of Columbia was...

Design of the Plane Train Tunnel West Extension

Design of the Plane Train Tunnel West Extension

The Plane Train tunnel project included developing of a 700-foot-long tunnel extension to the existing Plane Train automated people mover (APM) beyond the airport’s domestic baggage claim terminus station. This extension created a more efficient train turn-around...

Ottawa Light Rail Transit

Ottawa Light Rail Transit

Ottawa Light Rail Transit is a 2.4-km-long two-track running tunnel and Rideau underground station. The tunnel is 10 m wide between spring lines with its crown between 12 and 26 m below ground surface. The tunnel was driven in the local Verulam and Lindsay sedimentary...