Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Geophysical pre-investigation for a Stockholm tunnel project : Joint inversion and interpretation of geoelectric and seismic refraction data in an urban environment

Ronczka, Mathias LU ; Wisén, Roger LU and Dahlin, Torleif LU (2018) In Near Surface Geophysics 16(3). p.258-268
Abstract

Underground constructions for public traffic purposes are becoming increasingly important for urban areas in order to use the limited space more efficiently. Several electric resistivity tomography and seismic refraction tomography measurements were performed crossing a water passage near Stockholm during the pre-investigation phase of a tunnel building project. The objective was to determine the bedrock interface and qualitatively assess the rock quality. The scope of this study is to present a field case in an urban environment and show improvements of geophysical results due to additional model constraints by a joint inversion. Results of individual inversions show a large transition zone below the seabed from electric resistivity... (More)

Underground constructions for public traffic purposes are becoming increasingly important for urban areas in order to use the limited space more efficiently. Several electric resistivity tomography and seismic refraction tomography measurements were performed crossing a water passage near Stockholm during the pre-investigation phase of a tunnel building project. The objective was to determine the bedrock interface and qualitatively assess the rock quality. The scope of this study is to present a field case in an urban environment and show improvements of geophysical results due to additional model constraints by a joint inversion. Results of individual inversions show a large transition zone below the seabed from electric resistivity tomography. Some parts of the seismic refraction tomography have a low model resolution, due to gas-bearing sediments with a low velocity together with a high noise level, which leads to insufficient investigation depth that makes it difficult to determine the bedrock interface. However, the bedrock interface could be reconstructed in the resistivity model by performing a joint inversion, using the seismic velocity model to constrain the electric resistivity tomography model and vice versa. Adjacent geotechnical soundings support the joint inversion results. A vertical low resistive zone could be identified as a dominant fracture zone in the southern part of the investigated area. In general, the joint inversion approach significantly improved the electric resistivity tomography results and provided a more reliable bedrock estimation.

(Less)
Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ERT, Joint inversion, Seismic refraction, SRT, Urban geophysics
in
Near Surface Geophysics
volume
16
issue
3
pages
11 pages
publisher
EAGE
external identifiers
  • scopus:85048553334
ISSN
1569-4445
DOI
10.3997/1873-0604.2018009
project
Geoelectrical Imaging for Site Investigation for Urban Underground Infrastructure
Integrated Use and Interpretation of Data from Geophysical and Non-Geophysical Methods for Site Investigation for Underground Construction
language
English
LU publication?
yes
id
63886bad-0244-41f6-a018-d501af948551
date added to LUP
2018-06-29 13:33:51
date last changed
2021-09-22 03:29:34
@article{63886bad-0244-41f6-a018-d501af948551,
  abstract     = {<p>Underground constructions for public traffic purposes are becoming increasingly important for urban areas in order to use the limited space more efficiently. Several electric resistivity tomography and seismic refraction tomography measurements were performed crossing a water passage near Stockholm during the pre-investigation phase of a tunnel building project. The objective was to determine the bedrock interface and qualitatively assess the rock quality. The scope of this study is to present a field case in an urban environment and show improvements of geophysical results due to additional model constraints by a joint inversion. Results of individual inversions show a large transition zone below the seabed from electric resistivity tomography. Some parts of the seismic refraction tomography have a low model resolution, due to gas-bearing sediments with a low velocity together with a high noise level, which leads to insufficient investigation depth that makes it difficult to determine the bedrock interface. However, the bedrock interface could be reconstructed in the resistivity model by performing a joint inversion, using the seismic velocity model to constrain the electric resistivity tomography model and vice versa. Adjacent geotechnical soundings support the joint inversion results. A vertical low resistive zone could be identified as a dominant fracture zone in the southern part of the investigated area. In general, the joint inversion approach significantly improved the electric resistivity tomography results and provided a more reliable bedrock estimation.</p>},
  author       = {Ronczka, Mathias and Wisén, Roger and Dahlin, Torleif},
  issn         = {1569-4445},
  language     = {eng},
  month        = {06},
  number       = {3},
  pages        = {258--268},
  publisher    = {EAGE},
  series       = {Near Surface Geophysics},
  title        = {Geophysical pre-investigation for a Stockholm tunnel project : Joint inversion and interpretation of geoelectric and seismic refraction data in an urban environment},
  url          = {https://lup.lub.lu.se/search/files/47061365/Ronczka_Wis_n_Dahlin_2018_joint_inversion_and_interpretation_of_ERT_SRT_NSG_16_258_268.pdf},
  doi          = {10.3997/1873-0604.2018009},
  volume       = {16},
  year         = {2018},
}