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Keywords: sprayed concrete
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Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2012, May 28–30, 2012
Paper Number: ISRM-EUROCK-2012-015
... to an existing water treatment plant and a pedestrian escape route connects the cavern to the plant. Two zones of bad rock conditions were unveiled during construction, each of approximately 15 m length. Permanent rock support in these zones consisted of rein-forced ribs of sprayed concrete (RRS) in addition...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2012, May 28–30, 2012
Paper Number: ISRM-EUROCK-2012-036
... reinforced sprayed concrete and 6 m long and 12 m long end- anchored bolts spaced 2.2 m, which in practice will be grouted after advance of the tunnel face. The 12 m long bolts are placed in the eastern side of the tunnel, where modeling of unsupported tunnels indicated failure (the largest possible wedge...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2010, June 15–18, 2010
Paper Number: ISRM-EUROCK-2010-100
... ABSTRACT: Steel fibre reinforced concrete is used for many years in spray concrete for tunnel as temporary lining and even final lining. Multiple research studies and tests on the behavior of steel fibre reinforced concrete have been carried out in recent years in various countries. They have...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2002, November 25–27, 2002
Paper Number: ISRM-EUROCK-2002-066
..., and have no covering. They only have a primary support in a few highly localised zones. Madeira Island sprayed concrete portal widening Encumeada tunnel levada Island canal execution intake structure Thickness localised zone marine transportation characteristic hydraulic exploitation...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2002, November 25–27, 2002
Paper Number: ISRM-EUROCK-2002-072
... of the Icelandic basalt (Jonsson, 8.) L.' ·He,Il: r :)r 1'· ~ t:l ~tj:f'I"o(-r1I 1ttx."Yfly l;J'1 ··1~! lava succession stability problems occurred in the abutment and particularly where layers of sediments were present. Rock support by means of rock bolts and sprayed concrete became the only measures used...

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