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Extreme expansive phenomena in anhydritic-gypsiferous claystone: the case of Lilla tunnel

Autor(en):


Medium: Fachartikel
Sprache(n): Englisch
Veröffentlicht in: Géotechnique, , n. 7, v. 63
Seite(n): 584-612
DOI: 10.1680/geot.12.p.143
Abstrakt:

The paper describes the expansive phenomena affecting Lilla tunnel in Spain during construction and subsequent operation. The geology of the site and the performance of alternative support designs are described. Field observations are analysed to identify the causes of the observed swelling. It was found that long-term swelling in Lilla tunnel was the result of gypsum crystal growth in discontinuities. The phenomenon was a consequence of a few contributing factors: significant presence of anhydrite, existent or activated discontinuities, and the circulation of water. These conditions were present in the highly tectonised Tertiary claystone in Lilla. The original horseshoe cross-section was transformed into a circular one, and a reinforced concrete lining was built to resist swelling pressures. Long-term monitoring of the reinforced tunnel provided valuable data on the evolution of swelling pressures against the lining, and on the stresses developed in the resisting structure. The highly heterogeneous distribution of swelling pressures against the lining explains the low strains measured in reinforcement bars despite the very high maximum swelling pressures recorded.

Structurae kann Ihnen derzeit diese Veröffentlichung nicht im Volltext zur Verfügung stellen. Der Volltext ist beim Verlag erhältlich über die DOI: 10.1680/geot.12.p.143.
  • Über diese
    Datenseite
  • Reference-ID
    10674084
  • Veröffentlicht am:
    12.06.2022
  • Geändert am:
    12.06.2022
 
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