Use of Steel-Fiber Reinforced Wet-Mix Shotcrete in Extreme Rock-Bursting Conditions

by Torbjorn Lilleas, A/S Veidekke, Norway,
Ole Arnfinn Opsahl, A/S Veidekke, Norway,

Document Type: Proceeding Paper

Part of: Shotcrete for Underground Support V


If the stresses close to tunnels or caverns exceed the capacity of the surrounding rock, rock-bursting might start. When tunneling in such rock conditions the need for a safe, quick and economic rock support is obvious to avoid delays in production progress. During the last 10 years Norway has gained valuable experience with the use of steel fiber reinforced shotcrete against heavy rock-bursting. The development of equipment and concrete technology have enabled us to use longer steelfibers. This is important to give the shotcrete lining increased fracture toughnes, and make the linings suited to resist the heavy action from rockbursting. This paper will deal with the experience from 2 different projects in Norway.

Subject Headings: Steel fibers | Reinforcing steel | Materials processing | Shotcrete | Rock properties | Cracking | Linings | Reinforced concrete | Norway | Europe

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