Design criteria for permeation grouting in hard rock at great depths

Axelsson, Magnus,1974Chalmers tekniska högskola,Chalmers University of Technology (författare)

Grouting at tunnelling in hard rock at great depths below the groundwater table, when constructing a nuclear waste repository for example, makes special demands on the strength of the grout in order to resist groundwater forces. The aim of this study is to distinguish the most important parameters to ensure that suitable grouting can be performed at large depths. Initially, laboratory studies were conducted in order to determine the most critical parameters. The results from the laboratory tests were used in a field study at the Äspö Hard Rock Laboratory in Sweden. The results indicate that the most important characteristics for the rock are the fracture aperture and the groundwater gradient and for the grout: a resolute grouting pressure and sufficient early strength. This implies that for cementitious grouts the yield stress is important and for non-cementitious grouts it is the shear strength prior to gelling. The results emphasise the need to perform hydraulic characterisation of the rock mass in advance. The results also show the importance of performing a proper grouting, especially at large depths where a decreased penetration length of the grout increases the risk of a high gradient and hence erosion of the grout.

Gustafson, Gunnar,1945Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)g2 (författare)
Fransson, Åsa,1971Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)frans (författare)
Funehag, Johan,1975Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)johanfn (författare)
Chalmers tekniska högskola (creator_code:org_t)

Ingår i:Proceedings World Tunnel Congress 2008, Underground facilities for better environmnet and saftey1, s. 510-520

Av författaren/redakt...: Axelsson, Magnus ...; Gustafson, Gunna ...; Fransson, Åsa, 1 ...; Funehag, Johan, ...

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