Australian Design Experience on the Second Avenue Subway and the Manhattan Tunnel Project

Overview

Two of the most significant underground projects in the United States are utilising Australian Designers Firstly, the Second Avenue Subway Phase 2 (SAS2) is a USD $2.0 billion extension of New York City’s Q train from 96th Street to 125th Street. SAS2 adds three new stations and utilises tunnel boring, cut-and-cover and conventional mining methods, concurrently to achieve revenue service in 2032. Secondly the Manhattan Tunnel Project, which utilizes jet grouting, ground freezing, and shield tunnelling prepare a pathway through historic buried obstructions on the Eastern bank of the Hudson River to allow completion of the Hudson River Tunnels into Penn Station.

Together the two projects span the full range of urban underground practice, from hard rock caverns to shallow soft-ground tunnelling in congested ground.

Timings

• 5:30pm: Welcome and networking
• 6:00pm: Presentation
• 6:45pm: Q&As
• 7:00pm: Event Finishes

Venue

• Online AND
• In-person at Delve Underground Melbourne Office

Speakers

Denis Tepavac
Denis Tepavac (CPEng, MIEAust, NER, RPEQ, RPEV) is a Senior Associate at Delve Underground with 17 years of tunnelling experience across transportation, water, and wastewater projects in Australia and internationally. He specializes in the design of mined tunnels and caverns and large-scale underground structures, underpinned by advanced structural and geotechnical numerical modeling. On New York’s Second Avenue Subway, Denis is the Design Discipline Lead for the station cavern and short tunnels. His Australian portfolio spans North East Link, WestConnex, and Sydney Metro, where he has led complex sequential excavation and permanent lining design. He is a passionate member of the Australasian Tunnelling Society.

Dean Treweek

Dean Treweek (CPEng, MIEAust, NER, RPEV, RPEQ) is a Senior Associate at Delve Underground with 18 years of experience in tunnel, shaft, and tunnelling-related design, with a particular focus on segmental lined tunnels and permanent secondary tunnel linings. On the Gateway Program’s Manhattan Tunnel Project, Dean is the Design Unit Lead for the tunneling package including the precast expanded segmental tunnel lining design. His recent Australian portfolio spans North East Link, Melbourne Metro, M6 Motorway in Australia, along with international work across the United States and the Middle East. He is a passionate member of the Australasian Tunnelling Society.