Join our experts at the following technical sessions.
Monday, June 12 | 10:00 am
Second Narrows Water Supply Tunnel – Conventional Deep Shaft Excavation in Variable Weak Rock. Speaker: Bruce Downing
The Second Narrows Water Supply Tunnel crossing beneath Burrard Inlet is an important component of the Greater Vancouver Water District’s plans to increase seismic resilience and meet increasing water demands. The project included the 110 m (350 ft) deep South TBM Receival Shaft, the deepest shaft to date in the sedimentary rock unit underlying much of metro Vancouver. The shaft encountered varied sedimentary rock types including fractured rock associated with a fault underlying Burrard Inlet. This paper discusses the design and construction challenges associated with this shaft and the means necessary to complete the shaft in time for TBM arrival.
Monday, June 12 | 2:30 pm
Gateway Program – Cut and Cover Tunnel in Manhattan. Speakers: David Smith, Drew Bazil and Matteo Ferrucci
The Gateway program will provide additional rail capacity between New Jersey and Manhattan. This paper describes the how a 90-foot-deep section of cut-and-cover tunnel was designed to directly support future high-rise towers. The tunnel will link a previously completed tunnel sections under Hudson Yards to future tunnels under the Hudson River. The design aims to minimize constraints on future overbuild and future tunnels, while maximizing constructability within a small worksite. Design optimizations between Preliminary and Final Design are described. The tunnel will pass under the High Line walkway, next to an active rail yard, and close to a subway tunnel.
Monday, June 12 | 2:30 pm
Ground Control Approaches and Methods
Bay Park Conveyance Project, NY – Construction Update. Speaker: David Smith
Nassau County, New York, is improving the water quality in the Western Bays of Long Island. A major step forward will be the completion of the Bay Park Conveyance Project, which will divert treated effluent away from the Western Bays to an existing ocean outfall. The ongoing works include constructing 3.6 miles of microtunneling, 7 miles of sliplining, 14 shafts, and a 75 MGD pump station. This paper provides an update on construction progress, challenges and solutions. The project is a collaborative effort between Nassau County, New York State Department of Environmental Conservation, the Design-Builder and consultants.
Wednesday, June 14 | 10:30 am
Down for That – Informational Session
Chair: Everett Litton
Helping the tunneling industry attract and retain the next generation of tunneling talent. Chair Everett Litton will share exciting updates related to ongoing university and professor outreach efforts aimed at broad and robust engagement with students, including updates related to tunnel tour success stories along with ambitions to attract and retain the best and brightest talent from universities, technical schools, and high schools from across the United States. Down for That is UCA’s initiative aimed at student engagement through a variety of resources and opportunities available for students to learn and get involved in the underground construction profession. Learn how you can help get involved and help support this exciting initiative.
Wednesday, June 14
Chair: David Smith