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Tools to simulate changes in hydraulic flow systems in complex geologic settings affected by tunnel excavation

Scheidler, Stefan and Huggenberger, Peter and Butscher , Christoph and Dresmann , Horst. (2019) Tools to simulate changes in hydraulic flow systems in complex geologic settings affected by tunnel excavation. Bulletin of engineering geology and the environment, 78. pp. 969-980.

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Official URL: https://edoc.unibas.ch/59543/

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Abstract

Geotechnical problems during and after tunnel construction are often related to groundwater circulation. In tunnelling projects, however, groundwater flow systems are often only partly known. This uncertainty is manifested by the typically scarce hydraulic data that limits the understanding of subsurface hydrogeological processes. In particular, there is a general lack of data documenting groundwater flow changes caused by tunnelling. The present paper presents a concept involving an iterative understanding of subsurface hydrogeological systems influenced by tunnelling. A major challenge of our approach consists of integrating complex geological geometries from a 3D geological model (GOCAD) into a numerical groundwater flow model (COMSOL Multiphysics). The starting point is a 3D geological model representing a regional tectonic system located in the Jura Mountains in Switzerland. This geological model is transferred into regional and local-scale groundwater flow models. Due to the lack of hydrogeological data, a 3D view of geological–hydrogeological systems is often required to respond to groundwater-induced geotechnical problems in tunnelling. Numerical groundwater flow models make it possible to perform sensitivity analysis and to test how boundary conditions and hydraulic property distributions influence calculated groundwater flow regimes. In addition, our approach enables testing the effects of changes of hydraulic regimes due to tunnel excavation at different scales.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Applied Geology (Huggenberger)
UniBasel Contributors:Huggenberger, Peter and Scheidler, Stefan and Dresmann, Horst
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Springer
ISSN:1435-9529
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:09 Sep 2020 08:11
Deposited On:09 Sep 2020 08:11

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