PREVIEW | RETC 2023


by Black & Veatch, City of Columbus, DLZ, McMillen


Jacobs (now Delve), Schnabel Geostructural D&C, and Granite Construction


Hard rock TBMs and tunnels


(Track sponsor: Walsh Construction) ● From Norway comes two projects in papers by Skanska Norge – one looking at construction of the Nedre Fiskumfoss upgrade and replacement hydropower plant with major tunnel and cavern excavations in the far north, in a paper by Skanska Norge; and, another discussing multiple rock cavern construction for a new water supply project in Oslo.


● And, with a focus on the Italian-Austrian Alps, the experience of using risk prediction tools in TBM tunneling on the Mules 2-3 Lot of the Brenner Base Tunnel is discussed. Paper by Systra.


● From Canada, the focus is on construction of the multiple and varied tunnel and shaft structures for the Coxwell Bypass Tunnel project, in Toronto. Paper by Jay Dee Contractors and Jaydee Canada


● Also in Toronto, the achievements in TBM tunneling below Lake Ontario for the Ashbridges Bay Outfall Tunnel will be discussed. Paper by Robbins


● Wastewater is again the focus in a paper looking this time at the Sister Grove Outfall Pipeline project, in Texas, which used TBMs to excavate rock and mixed- face conditions similar to others previously bored through. McMillen Jacobs (now Delve)


● Considerations for enhanced probe drilling and pre- grouting design on hard rock TBMs are discussed, with reference to Lower Meramec and Jefferson Barracks tunnels. Paper by Robbins


Afternoon


Design (Track sponsor: HNTB) ● A look at drill & blast tunneling and deep shaft construction, all for water intakes on a quarry- to-storage reservoir conversion project that was executed using collaborative design development. Paper by Schnabel, Guy F. Atkinson Construction, Arcadis, Loudoun Water, and Black & Veatch


● Design focus on the new large underground structures for a parallel Central City Tunnel below Minneapolis to increase the stormwater drainage system’s capacity to handle heavy rainfall events. Paper by Hatch, CNA Consulting Engineers, and City of Minneapolis


● From New York comes a review of design for a deep section of cut and cover tunnel capable of supporting high-rise buildings, as part of the Gateway program that could enable airspace rights real estate development. Paper by WSP and Amtrak


● Review and discussion of corrosion analyses of liners in gravity sewer tunnels, including fibre reinforcement and carbon footprints. Paper by Parsons


● Underground construction in support of high-energy physics R&D is discussed in the case study of a tunnel for the particle accelerator in LCLS-II-HE project, in Menlo Park, California. Paper by Mott MacDonald and SLAC National Accelerator Laboratory


52 | Summer 2023


Ground control approaches and methods ● Evaluating the loading effects of constructing a


high-rise building and consequent estimated tunnel behaviors in the two underground metro lines below, in LA, and then comparison with construction monitoring. Paper by McMillen Jacobs (now Delve), Geotechnologies, Jamison Properties, and LA Metro


● Examination of ground movements during construction of a gravity-flow water pipeline tunnel constructed by EPBM, in California, and developed using PDB (discussed in a paper earlier in the day). This paper by Arup and JCK Underground


● Description and construction update of varied small bore tunneling and shaft works for the Bay Park Conveyance project, in Long Island, NY, that will divert treated effluent. Paper by WSP.


Microtunneling and trenchless tunneling (see box)


Shafts, caverns, and mining (Track sponsor: Walsh Construction) ● Construction description of the Shoreline Storage


Tunnel project, part of Project Clean Lake, in Cleveland, using a large diameter EPB machine plus shafts and pipe-jacking. Paper by McNally Tunneling


● Review of using artificial ground freezing (AGF) for deep shaft excavation for the upper geology before advancing below into gneiss bedrock on Tunnel No3 of New York City’s water supply system. Paper by Keller, McMillen JA Engineering, and Walsh Construction


● Looking at shafts again, this time with two methods of works – the design and construction of excavation support with secant piles in glacial soil, and controlled blasting in complex sedimentary strata with site-specific controls in an urban setting. Paper by Mueser Rutledge Consulting Engineers, Civil & Building North America, Barletta, and Stantec


● Another look at underground construction for high-energy physics R&D, this time considering the development and performance of large span caverns at depth in South Dakota. Paper by Arup and Fermi Research Alliance


SPONSORS OF RETC 2023 GOLD level: Jacobs; Traylor Bros, Inc; Hatch; Skanska; Jennmar Civil; Turnstone Industrial Solutions, LLC; Herrenknecht; Mott MacDonald; and, DSI Underground


SILVER level: JF Shea; Walsh Group; HNTB; Barnard, Inc; Dyno Nobel; and, Master Builders Solutions;


BRONZE level: JW Fowler; Dr Sauer & Partners; Schnabel Engineering; Schnabel (Geostructural Design & Construction); SAK; Black & Veatch; Brierley Associates; Delve Underground; Jay Dee; and, Stiver Engineering.


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