Change search
ReferencesLink to record
Permanent link

Direct link
Utvärdering av de geotekniska undersökningarna för Citylink tunneln i Stockholm: Studie av sonderingsmetoder samt sonderingsförfarande på vatten
2013 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Combining several different investigation methods within one project is something that is done on a daily basis. This master thesis analyses results from a project where methods that are relatively unusually within the geotechnical society are combined. The sounding program was also almost entirely executed on water.In the thesis geotechnical investigations performed by Vectura Consulting for the City Link project are evaluated. The City Link project is a TBM driven tunnel under the city of Stockholm, and the investigations was performed on the behalf of “Svenska kraftnät”. The thesis is performed on behalf of Vectura in Sundsvall where Per Nilsson has driven the issues which are the subject of this thesis.The methods used in the project has been soil-rock sounding, reflection- and refraction seismic, MWD-guided down the hole drill (DTH) and core drilling sampling. Every sounding except the core drilling sampling has been conducted on water. The core drilling sampling has in this thesis been infringed for the other methods. Complications and solutions regarding the performed sounding on water were found during the project, which resulted in a list of recommendations for performing sounding on water. Soil-rock sounding has been linked to the performed refraction seismic to investigate whether the seismic inferred rock quality could be shown in the soil-rock sounding. The analysis shows that it strongly tends to be possible, although more studies have to be done to confirm this theory. The study also shows the importance of having a seismic survey within a large scale geotechnical investigation where the bedrock level is of interest.MWD-guided down the hole drill is, within the geotechnical society, an uncommon method for rock-sounding. In this project the DTH were carried out on the sounding points where soil-rock sounding was estimated not to be possible to use, because of too large sounding depths. The aim of the investigations where to find the bedrock surface, which it also did. Further analysis also indicates that the rock quality in relation to all executed DTH soundings within the project could be distinguished.For both soil-rock sounding and DTH the method to integrate the sink rate and to form an index has given a simpler graphical interpretation of the soundings. The index which is formed by the driving force and the sink rate has also, and can be used to interpret the rock quality. The study also showed some significance regarding the weight of the sounding rods, especially for rock-soil sounding.

Place, publisher, year, edition, pages
2013. , 107 p.
Keyword [en]
Keyword [sv]
Teknik, Jb-sondering, MWD, utvärdering, seismik, sänkhammarborrning, sondering på vatten
URN: urn:nbn:se:ltu:diva-48876Local ID: 64ac4687-d262-479f-9530-ca796a683ab7OAI: diva2:1022220
External cooperation
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering, master's level
Validerat; 20130609 (global_studentproject_submitter)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

Open Access in DiVA

fulltext(3974 kB)0 downloads
File information
File name FULLTEXT02.pdfFile size 3974 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Lundman, Björn

Search outside of DiVA

GoogleGoogle Scholar
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: 3 hits
ReferencesLink to record
Permanent link

Direct link