UndergroundGeneralEFNARC Nozzleman Certification Scheme
Dan Millette
Read MoreEFNARC was an acronym for European Federation of National Associations Representing producers and applicators of specialist building products for Concrete,? which was founded by the European concrete industry in 1989.
RepairUndergroundVariability of Compressive Strength of Shotcrete in a Tunnel-Lining Project
Lihe (John) Zhang
Read MoreRecently, questions have been asked by the International Tunnelling and Underground Space Association (ITA) about what variability can be expected for compressive strength for shotcrete (sprayed concrete) in ground support projects.
RepairUndergroundGeneralShotcreting on Frozen Ground
Paul H. Madsen
Read MoreThe Northern Boulevard Crossing (NBX) is the keystone portion of the massive multi-billion-dollar East Side Access (ESA) Programme by the Metropolitan Transit Authority Capital Construction (MTACC) to bring Long Island trains into and out of New York City’s Grand Central Terminal.
UndergroundGeneralFallouts Can Be Deadly!
Joe Hutter
Read MoreMany years ago, when the use of shotcrete in an underground support system was not as popular as it is today, I witnessed a mine foreman walk into an underground opening to admire the job his shotcrete crew had done placing shotcrete only an hour
UndergroundGeneralThe Use of Shotcrete for Construction of Backfill Barricades in Mining Environments
Craig McDonald and Joe Hutter
Read MoreAs we all know, the mining process is essentially the excavation and extraction of rock, ore, gems, or other minerals from the earth?s surface.
UndergroundStructuralBriardale Gardens
John Andersen
Read MoreWith a population of over 8.17 million people, the city of London, England, continues to grow.
UndergroundHagerbach Underground Test Gallery
Dan Millette
Read MoreA world-class facility, the Hagerbach underground test gallery is located in Flums, Switzerland.
UndergroundInternationalJob Report on Hydropower Station in Stanzertal, Austria
Sascha Schreiner
Read MoreIt is remarkable that three different tunnelbuilding methods are being used on this hydropower station construction site: excavator, drill and blast, and tunnel boring machine (TBM) advancement.
RepairUndergroundStructuralCSX Pinkerton Tunnel
Dennis Bittner, Nick Laviolette, and Denis Laviolette
Read MoreAs part of the National Gateway Clearance Project, the Pinkerton Tunnel, located in Markleton, PA, was to be removed because it did not have the required height clearance to accommodate double-stack freight railroad cars.
RepairUndergroundStructuralWhere Are We Now with Sprayed Concrete Lining in Tunnels?
Andrew Pickett and Dr. Alun Thomas
Read MoreTraditional methods of sprayed concrete lining (SCL) tunnels (in soft ground) comprise a temporary primary lining of sprayed concrete with a sheet membrane inside and a permanent cast in-situ concrete lining, usually reinforced with steel bars