Change search
ReferencesLink to record
Permanent link

Direct link
Utvärdering av efterinjektering med polyuretan utifrån geologiska och hydrogeologiska grundförutsättningar
Stockholm University, Faculty of Science, Department of Geological Sciences.
2016 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
Abstract [en]

The aim of this master thesis is to evaluate the results of selective post-excavation grouting with polyurethane resin in the subway of Stockholm.Dripping and leakage of water into hard rock tunnels is a costly and commonly occurring problem. Water leakage does not only lead to damage to tunnel installation but may also affect the area above the tunnel due to lowering of the ground water table. To solve this problem there are several methods to prevent water entering the tunnel or to divert it. One of the preventing methods are to grout using polyurethane based resins.This thesis evaluates a drip sealing project where eight point leakages where grouted during November 2015. Drip mapping was carried out before and after the grouting to evaluate the change in leakage amount to determine whether the grouting methodology is suitable for future projects. The drip mapping was carried out during a year before the sealing attempt to investigate the leakages natural variation and with greater certainty being able to evaluate the leakage change after the grouting had been carried out.The evaluation of the grouting showed that none of the point leakages were sealed to 100 %. Only three of the leakages decreased, four increased and one showed no change. The natural variations during the evaluation period, during and after the grouting attempt indicates a natural rise in leakage amount induced by an increase in precipitation and rising seasonal trend.The change in leakage amount for every leakage point was compared to geological and hydrogeological parameters to be able to explain the cause of the results and to determine which conditions the methodology depends on. The correlation with original leakage amount, grouting volume and hydraulic aperture where the strongest and could best be explained by second degree polynomials. By using the equations for the polynomials an interval could be determined where the grouting methodology theoretically would lead to the greatest decrease in leakage amount. There are some uncertainty in the interpretation whether a natural signal in the grouting results led to a correlation due to an internal coupling between the parameters.

Place, publisher, year, edition, pages
Keyword [en]
Post-excavation grouting, polyurethane, leakage, dripping, evaluation
Keyword [sv]
Efterinjektering, polyuretan, inläckage, dropp, utvärdering
National Category
Geology Other Civil Engineering
URN: urn:nbn:se:su:diva-125477OAI: diva2:893363
External cooperation
Bergab - Berggeologiska Undersökningar AB
Available from: 2016-01-12 Created: 2016-01-12 Last updated: 2016-01-12Bibliographically approved

Open Access in DiVA

fulltext(3903 kB)50 downloads
File information
File name FULLTEXT01.pdfFile size 3903 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Department of Geological Sciences
GeologyOther Civil Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 50 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 107 hits
ReferencesLink to record
Permanent link

Direct link