Per citar aquest document: http://ddd.uab.cat/record/102785
Groundwater characterization of a heterogeneous granitic rock massif for shallow tunneling
Font-Capó, J. (Universitat Politècnica de Catalunya. Departament d'Enginyeria Geotècnica i Geociències)
Vazquez-Suñé, E. (Consejo Superior de Investigaciones Científicas. Institute of Environmental Assessment and Water Research)
Carrera, J. (Consejo Superior de Investigaciones Científicas. Institute of Environmental Assessment and Water Research)
Herms, I. (GEOCAT, Gestió de Projectes, S.A.)

Data: 2012
Resum: Shallow tunneling may encounter a number of problems, the most important of which is high water inflows in transmissive areas that are often associated with fractures or discontinuities. Moreover, research into shallow tunneling may be limited by the duration and cost of the civil engineering works. Two important aspects that are often overlooked are: variable groundwater behavior of faults (conduit, barrier, conduit-barrier), and role of groundwater connectivity between fractures that cross the tunnel and the rest of the rock massif. These two aspects should be taken into account in the geological and groundwater characterization to correct the tunnel design and minimize hazards. A geological study and a preliminary hydrogeological characterization (including a prior steady state investigation and cross bore-hole tests) were carried out in a granitic sector during the construction of Line 9 of the Barcelona subway (B-20 area). The hydrogeological conceptual model was constructed using a quasi-3D numerical model, and different scenarios were calibrated. Faults and dikes show a conduit-barrier behavior, which partially compartmentalized the groundwater flow. The barrier behavior, which is the most marked effect, is more prominent in faults, whereas conduit behavior is more notable in dikes. The characterization of groundwater media entailed a dewatering plan and changes in the tunnel course. This enabled us to construct the tunnel without any problems.
Drets: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l’obra i la creació d’obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l’obra original i es reconegui l’autoria de l’obra original. Creative Commons
Llengua: Anglès
Document: article ; recerca ; publishedVersion
Matèria: Inflow ; Shallow tunneling ; Fault-zone ; Modeling
Publicat a: Geologica acta, Vol. 10, Núm. 4 (desembre 2012) , p. 395-408, ISSN 1696-5728

Adreça alternativa: http://www.raco.cat/index.php/GeologicaActa/article/view/263675
DOI: 10.1344/105.000001773


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