The Cigar-Lake mine in Canada is one of the largest uranium mines in the world with uranium of very high purity. The mine is about 500 m deep and was flooded several times in the past. The mine was sealed with icing measures, first from underground and later from the surface. Due to the freezing and the associated volume increase, the lining of the galleries is massively stressed and partially destroyed.
Solution: shotcrete lining with hiDCon elements with convergence capacity
Conversion of the lining from a rigid tubing shell (B90, 60 cm thickness) to a flexible shotcrete shell with lattice girders and hiDCon elements (shotcrete thickness 20 cm).
The construction method was included in the operating licence of the Canadian Nuclear Safety Commission (CNSC) for the Cigar Lake Mine.
hiDCon® – Publications
- Tunneling in Squeezing Rock
- The use of highly deformable concrete elements tunneling in compressive and swelling rock conditions rock conditions
- Modular tunnel crumpling system for tunnels in highly swelling rock masses
- Deformable steel Support for major tunnel cross-sections tested in the Gotthard Base Tunnel
- Tunneling in swelling rock
- Saint Martin Squeeze, Barla
- DESIGN METHODS WITH YIELDING SUPPORT IN SQUEEZING AND SWELLING ROCKS, Kovari 2009
- Tunnelling in Squeezing RockYielding Elements and Face Control
- Design and analysis of yielding support in squeezing ground, Anagnostou 2007
- Lessons learned during the excavation of the Saint Martin, Barla
- Modular yielding support for tunnels in heavily swelling rock, Kovari 2007
- Design and realisation of the PRACLAY experimental gallery
- Large deformations in squeezing ground in the Saint-Martin La Porte gallery along the Lyon-Turin Base Tunne
- CERN HL-LHC POINT 1, The ‘flexible’ US/UW17 cavern temporary lining, an innovative solution
- Difficulties associated with high convergences during excavation of the Saint Martin La Porte access adit
- FLEXIBLE SUPPORTING FOR EXCAVATION IN CMHM “ARGILITE”
- ANDRA AFTES 2015
- SOUTÈNEMENT SOUPLE POUR LE CREUSEMENT DE GALERIES DANS LES ARGILITES DU CMHM
- Interpretation of Core Extrusion Measurements When Tunnelling Through Squeezing Ground