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
UndergroundReentry into a Shotcreted, Underground Heading
Michael Rispin
Read MoreWhether in a mine or a tunnel, the concept of keeping all people working under supported ground is an essentially sacred one. Even with the most stable ground, the risk of a ground fall causing injury to persons or possessions is greatly mitigated once proper
RepairArchitecturalUndergroundStructuralQuality Management of Shotcrete in North America
Dudley R. “Rusty” Morgan and Roland Heere
Read MoreAs for all construction materials, a proper program of quality management should be implemented in shotcrete construction to protect the owner™s investment. This article briefly examines typical shotcrete Quality Management (QM) practice in North America. QM can be considered to be comprised of Quality Assurance
RepairUndergroundShotcrete – The Repair Solution for the Memorial Tunnel
Henry A. Russell
Read MoreIn 1953, the Memorial Tunnel in Standard, WV, was constructed as a two-lane, 2800 ft (853 m) tunnel with semi-transverse ventilation. The owner operated the tunnel until the mid-1980s when a four-lane bypass was constructed to upgrade the turnpike to current Interstate standards. The tunnel
UndergroundInternationalThe Use of Macro-Synthetic Fiber-Reinforced Shotcrete in Australia
Matthew J. K. Clements and E. Stefan Bernard
Read MoreMacro-synthetic ber-reinforced shotcrete (SnFRS) has rapidly gained popularity in Australia over the past 5 years. This can be attributed mainly to the huge improvement in post-crack performance that has been demonstrated over recent years and the almost universal adoption of this material for ground support
UndergroundStructuralUse of Fiber-Reinforced Shotcrete
Peter C. Tatnall
Read MoreAs many of you Shotcrete readers know, there have been many articles published here on FRS, and many more where FRS is mentioned. Two articles in the premier issue of Shotcrete in February, 1999, mentioned FRS. I have been keeping a bibliography of Shotcrete articles
UndergroundRestoring the Century-Old Wachusett Aqueduct
Ray Town
Read MoreEvery day, residents of Eastern Massachusetts quench their thirsts, bathe, flush toilets, do the dishes, and water their lawns with water drawn from the Massachusetts Water Resources Authority (MWRA) water system. Thanks to the Quabbin and Wachusett Watersheds and Reservoirs, 2.2 million people and 5500
UndergroundInternationalSissach’s Saved by a Bypass
Daniel Herzog
Read MoreThe small village of Sissach, near Basel, in Switzerland is one of the nicest Swiss villages in the country, but the serenity is plagued each rush hour by heavy commuter traffic. The solution was a bypass tunnel running through the Chienberg hill to the north
UndergroundInternationalShotcrete for Underground Support IX
Dudley R. Morgan
Read MoreThe Japan Tunnelling Association (JTA) and International Tunnelling Association (ITA) sponsored the Shotcrete for Underground Support IX Conference held in Kyoto, Japan, from November 17-20, 2002. It is a cooperative conference with the United Engineering Foundation, New York, which sponsored the previous eight conferences, the