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Auteur (up) Jeannin, P.-Y.; Malard, A.; Rickerl, D.; Weber, E.
Titre Assessing karst-hydraulic hazards in tunneling – the Brunnmühle spring system – Bernese Jura, Switzerland Type Journal Article
Année 2015 Publication Environmental Earth Sciences Revue Abrégée
Volume 74(12) Numéro Pages 7655-7670
Mots-Clés KarstALEA
Résumé Drilling a tunnel in a karst region requires the assessment of disturbances in the

hydrogeological functioning of aquifers and flow-systems as well as disturbances for

the tunnel itself. A complete characterization of the karst hydrogeological functioning

and the establishment of prevention measures are essential in order to insure a

suitable construction. The paper relates investigations which were conducted in the

frame of the construction of a safety gallery (Sisto) in the bernese Jura (Switzerland).

This gallery is located close to the outlet of a regional karst system and parallel to an

existing highway tunnel, which met numerous disorders in the past due to the

intersection of active karst conduits with a discharge reate exceeding 1 m3/s.

The KarstALEA method was applied along the Sisto trace in order to identify sections

with a high probability of karst occurrences and to characterize the type of karst related

problems. The main issue turned out to be related to water head and discharge, which

could potentially be cut by the tunnel construction. The system discharge rate may

frequently exceed 10 m3/s, and most of this water could potentially flow into the tunnel.

Therefore, a hydraulic model was set up in order to assess expected flow rates and

heads if conduits are intersected during the construction. Based on this model and on

meteorological and hydrological real-time measurements, a predictive model was

established in order to anticipate high-flows events.
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Notes DOI: 10.1007/s12665-015-4655-5 Approuvé no
Numéro d'Appel refbase @ user @ collection 129
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