APPLICATION OF SEEPAGE FLOW MODELS TO A DRAINAGE PROJECT IN FRACTUREDROCK

Authors
Citation
C. Gmunder et T. Arn, APPLICATION OF SEEPAGE FLOW MODELS TO A DRAINAGE PROJECT IN FRACTUREDROCK, Rock mechanics and rock engineering, 26(2), 1993, pp. 113-135
Citations number
10
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary","Engineering, Civil
ISSN journal
0723-2632
Volume
26
Issue
2
Year of publication
1993
Pages
113 - 135
Database
ISI
SICI code
0723-2632(1993)26:2<113:AOSFMT>2.0.ZU;2-C
Abstract
Various theoretical approaches are used to model groundwater flow in f ractured rock. This paper presents the application of several approach es to the restoration of the drainage of Rofla tunnel, Grisons, Switze rland. In this tunnel it became necessary to take measures against the washing out of calcium carbonates from the tunnel lining cement, beca use the calcium carbonate clogged up the existing drainage tubes leadi ng to increased rock water pressures on the inside arch of the tunnel. Drainage boreholes were drilled on a section of the tunnel and their influence on the water pressures was monitored. On the basis of the ge ological survey different seepage flow models were established to repr oduce the measured water pressures. The models were then used to predi ct the future water pressures acting on the tunnel lining after restor ation. Thus, the efficacy of the different drainage proposals could be predicted and therefore optimised. Finally, the accuracy of the predi ctions is discussed and illustrated using the measurements in the test section.