Re-injection of groundwater by pressurizing a segmental tunnel lining with permeable backfill
Författare
Summary, in English
Recently, within a tunneling project, a method for reinjecting discharged groundwater at tunnel level has been investigated. The method was performed by pressurizing a long section of the lining With ungrouted pea gravel as backfill, in a rock mass with low hydraulic conductivity. Water was reinjected through watertight lining into a section where un-grouted pea gravel was used as backfill. The pressure response was measured both behind the lining and in the rock mass, the latter by means of several observation wells drilled from ground level. Reinjecting water into a rock mass by pressurizing a lining with a permeable backfill (Such as un-grouted pea gravel) was found to be possible and feasible. Well testing methods developed for vertically drilled wells, such as a step injection test and constant head/pressure tests, Were used and found to be applicable, even for testing at tunnel level. It was also found that well known analytical Solutions, developed for vertically drilled wells, can be used for interpretation, e.g. transmissivity from tests performed at tunnel level and from the pressure response in two of the observation wells. (c) 2009 Elsevier Ltd. All rights reserved.
Avdelning/ar
Publiceringsår
2010
Språk
Engelska
Sidor
129-138
Publikation/Tidskrift/Serie
Tunnelling and Underground Space Technology
Volym
25
Issue
2
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Geotechnical Engineering
Nyckelord
- Hallandsas project
- Segmental lining
- Permeable backfill
- Re-injection
- Well testing
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1878-4364