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Project Stories | Ground support of station caverns and shafts


About Project

The Access to the Region’s Core (ARC) Project’s main goal was to provide increased commuter rail capacity from northern New Jersey to Manhattan. The project included new railway terminals and caverns under 34th Street in Manhattan between 6th and 8th Avenues, shafts at Dyer Avenue, 33rd Street and 35th Street, utility tunnels to connect the shafts and caverns, and escalator tunnels to provide access from the surface to the station platforms.


Trans Hudson Express (THE) station cavern New York Penn station Expansion (NYPSE) cross-section

Trans Hudson Express (THE) station cavern
New York Penn station Expansion (NYPSE) cross-section



Project Name

Trans Hudson Express Tunnel (THE Tunnel)


New York, USA

Construction Period

2009 – 2010


THE Partnership (Parsons Brinckerhoff/STV/DMJM Joint Venture)


Gall Zeidler Consultants


Gall Zeidler Consultants (GZ) provided lead engineering and design services for the main station cavern, tunnel segments and underground structures to be constructed using drill and blast methods with rock reinforced and shotcrete for initial ground support. The services included construction sequence for all structures, excavation and support drawings, and three dimensional (3D) numerical modeling of the station cavern. These segments included temporary access adits from both of the 33rd and 35th Street shafts, access and ventilation shafts, utility and escalator tunnels and the New York Penn Station Expansion (NYPSE) cavern. All structures, except the escalator tunnels, are designed with a PVC waterproofing membrane and a full drainage system followed by final lining. To quantitatively assess the ground support of the station cavern, a detailed 3D numerical analysis was undertaken to appropriately simulate the excavation and support sequencing.


Trans Hudson Express (THE) station cavern (NYPSE) ground support model

Trans Hudson Express (THE) station cavern (NYPSE) ground support model


Total displacement result

Total displacement result





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