The 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.
Fallouts Can Be Deadly!
Many 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 or two earlier.
The Use of Shotcrete for Construction of Backfill Barricades in Mining Environments
As we all know, the mining process is essentially the excavation and extraction of rock, ore, gems, or other minerals from the earth?s surface.
Briardale Gardens
With a population of over 8.17 million people, the city of London, England, continues to grow.
Hagerbach Underground Test Gallery
A world-class facility, the Hagerbach underground test gallery is located in Flums, Switzerland.
Job Report on Hydropower Station in Stanzertal, Austria
It 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.
The Outstanding Underground Project
Honorable Mention
CSX Pinkerton Tunnel
As 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.
Where Are We Now with Sprayed Concrete Lining in Tunnels?
Traditional 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