UndergroundOutstanding Underground Project: The Center for National Response
Henry A. Russell, Jr.
Read MoreIn 1953, the Memorial Tunnel in Standard, WV, was constructed as a two-lane, 2800 ft (853 m) tunnel with semi-transverse ventilation.
UndergroundTiber Creek Tunnel Project
Khaldoun El-Jallad
Read MoreEllicott City, MD, enjoys a rich and varied history, from its origin as the tiny trade center of Ellicott?s Mills to the present seat of rapidly urbanizing Howard County.
RepairUndergroundStructuralStructural Shotcrete Overhead
Warren Harrison
Read MoreAs a contractor, I have frequently been asked if shotcrete can be used for overhead applications.
UndergroundSlope Stabilization in an Open Pit Mine
Michael Keienburg
Read MoreThe government of the Republic of Botswana and De Beers Centenary AG own the Debswana Diamond Company in equal share.
RepairArchitecturalUndergroundOverhead Shotcrete
Ted W. Sofis
Read MoreWhen you say overhead, people invariably think of fixed costs, salaries, and the general costs of running a business.
UndergroundInternationalFreeport’s New Barmac Delivers High-Quality Shotcrete Sand
Stacy Goldsworthy and Samuel Hewitt
Read MoreIn November 1936, during a climbing expedition to the glacier-capped peaks of central New Guinea, Dutch Petroleum Geologist Jean Jaques Dozy discovered a massive copper mineralized outcrop
UndergroundShotcrete Spraying Machines for Immediate Support in Tunnels
Michael Keienburg
Read MoreTunnels are important elements in modern industrial society.
UndergroundRobotic Shotcrete Applications for Mining and Tunneling
Michael Rispin, Chris Gause, and Thomas Kurth
Read MoreIf a robotic applicator is mentioned in connection with mining or tunneling and shotcrete, what is meant is an apparatus used to hold and control a spraying nozzle. Why should this be necessary when a man can do the same work? Tunneling and mining development
UndergroundUnderground Shotcrete Quality Assessment
Denis Beauprè, Jean-François Dufour, Joe Hutter, and Marc Jolin
Read MoreDuring the 1990s, the use of dry-mix shotcrete as a tool for ground support became much more prevalent in Canadian hardrock mines. With this increase in dry-mix shotcrete use came the need to develop a practical and accurate method for determining the quality of the
UndergroundEarly-Age Test Methods for Fiber-Reinforced Shotcrete
Stefan Bernard
Read MoreToughness is at least in part influenced by the compressive strength of the shotcrete matrix, so concrete strength is doubly important for ground control. In time-critical environments such as heading development in mines and most tunnels, the cost of excavation is often strongly influenced by