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Effects of tunneling on groundwater flow and swelling of clay-sulfate rocks

Butscher, C. and Einstein, H. H. and Huggenberger, P.. (2011) Effects of tunneling on groundwater flow and swelling of clay-sulfate rocks. Water Resources Research, 47. pp. 66-76.

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Official URL: http://edoc.unibas.ch/46591/

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Abstract

Swelling of clay-sulfate rocks is a major threat in tunneling. It is triggered by the transformation of the sulfate mineral anhydrite into gypsum as a result of water inflow in anhydrite-containing layers after tunnel excavation. The present study investigates the hydraulic effects of tunneling on groundwater flow and analyzes how hydraulic changes caused by excavation lead to water inflow into anhydrite-containing layers in the tunnel area. Numerical groundwater models are used to conduct scenario simulations that allow one to relate hydrogeological conditions to rock swelling. The influence of the topographic setting, the excavation-damaged zone around the tunnel, the sealing effect of the tunnel liner, and the geological configuration are analyzed separately. The analysis is performed for synthetic situations and is complemented by a case study from a tunnel in Switzerland. The results illustrate the importance of geological and hydraulic information when assessing the risk of swelling at an actual site.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geologie-Paläontologie > Applied Geology (Huggenberger)
UniBasel Contributors:Huggenberger, Peter
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Geophysical Union
ISSN:0043-1397
e-ISSN:1944-7973
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:30 Nov 2017 08:07
Deposited On:30 Nov 2017 08:07

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