Design of temporary rock support for SFR
The final repository for short-lived radioactive waste (SFR) is owned and operated by the Swedish Nuclear Fuel and Waste Management Company (SKB) and have been active since 1988. SKB is now planning to extend the facility with five 275 meters long and one 240 meter long vault linked to the excisting facility. Vibrations associated with the construction of the new vaults could lead to fall-out of loose rock and previously installed shotcrete, which could lead to injuries and/or infrastructure damage of the existing facility. To prevent this a temporary support system had to be designed for the potentially loose rock.
Itasca designed a system of rock support consisting of rock bolts and a steel wire mesh to prevent fall-out of loose rock and shotcrete using a combination of analytical methods and engineering judgement. Analytical methods included arching action of jointed rock (as shown below) and support of loosened rock volume in the roof.