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Tunnelling in sulphate claystones
Alonso Pérez de Agreda, Eduardo; Berdugo de Moya, Iván Rafael; Tarragó, Dani; Ramon Tarragona, Anna
Universitat Politècnica de Catalunya. Departament d'Enginyeria del Terreny, Cartogràfica i Geofísica; Universitat Politècnica de Catalunya. MSR - Mecànica del Sòls i de les Roques
The paper reviews first the performance of some tunnels built in gypsiferous-anhydritic rocks, especially in Central Europe. Then, a description of the main gypsum-laden lithological rock units in Spain is made as an introduction for a description of the conditions found in a number of recently built tunnels in Spain, most of them associated with the construction of high speed railway infrastructure. Some features associated with observed heave (presence ofwater, tectonics, high sulphate content of naturalwater) have been isolated.Adiscussion of the mechanisms leading to field expansion is then made. The classical theory of anhydrite-gypsum transformation is replaced by a mechanism of crystal growth when natural water reaches a condition of supersaturation. Field evidence in support of this interpretation is given by the detailed analysis of Lilla Tunnel, located in Tarragona, Spain, which has experienced severe heave problems immediately after excavation.
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Túnels i excavacions
Tunneling
Clay
Tunnel
swelling
gypsum
anhydrite
claystone
Túnels -- Construcció
Sòls argilosos
info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
IOS Press
         

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