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Field-Scale Quality Control of Lime-Cement Pillar in Conductive Clay Using Electrical Resistivity Tomography

Olsson, Per-Ivar LU ; Rejkjär, Simon LU and Dahlin, Torleif LU (2019) Near Surface Geoscience 2019 - 1st Conference on Geophysics for Infrastructure Planning, Monitoring and BIM
Abstract
Ground improvement with lime-cement pillars is becoming increasingly common in the Nordic countries for exploitation of areas with poor stability. However, there is no non-destructive method for quality control of the ground improvement. Significant changes in the electrical properties after mixing of the binders make electrical resistivity tomography (ERT) a potential method. In connection with lime-cement pillar trials for the Västlänken project in Gothenburg, Sweden, a series of different single borehole ERT measurements were performed. Three cases are compared in this paper: untreated ground, treated uncured ground and treated cured ground. The raw data pseudosections show a significant general drop in resistivity between the untreated... (More)
Ground improvement with lime-cement pillars is becoming increasingly common in the Nordic countries for exploitation of areas with poor stability. However, there is no non-destructive method for quality control of the ground improvement. Significant changes in the electrical properties after mixing of the binders make electrical resistivity tomography (ERT) a potential method. In connection with lime-cement pillar trials for the Västlänken project in Gothenburg, Sweden, a series of different single borehole ERT measurements were performed. Three cases are compared in this paper: untreated ground, treated uncured ground and treated cured ground. The raw data pseudosections show a significant general drop in resistivity between the untreated and treated uncured data sets, while the curing process increase the resistivity significantly close to the borehole. Full 3D inversions have been carried out for all three cases. In model space the cured pillar is still causing a clear increase in resistivity around the borehole, while the decrease between the untreated and uncured case is less obvious than in data space. With the large contrast between the untreated and the treated uncured in data space it was expected to be visible in model space, improved inversion methods and settings could help resolve this. (Less)
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type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
Proceedings of the 1st Conference on Geophysics for Infrastructure Planning, Monitoring and BIM
publisher
European Association of Geoscientists and Engineers, EAGE
conference name
Near Surface Geoscience 2019 - 1st Conference on Geophysics for Infrastructure Planning, Monitoring and BIM
conference dates
2019-09-08 - 2019-09-12
DOI
10.3997/2214-4609.201902561
language
English
LU publication?
yes
id
cac6f7d6-6bbb-47b7-91ba-ed1be1b0b3dd
alternative location
http://www.earthdoc.org/publication/publicationdetails/?publication=99039
date added to LUP
2019-09-02 14:10:04
date last changed
2019-09-25 02:18:07
@inproceedings{cac6f7d6-6bbb-47b7-91ba-ed1be1b0b3dd,
  abstract     = {Ground improvement with lime-cement pillars is becoming increasingly common in the Nordic countries for exploitation of areas with poor stability. However, there is no non-destructive method for quality control of the ground improvement. Significant changes in the electrical properties after mixing of the binders make electrical resistivity tomography (ERT) a potential method. In connection with lime-cement pillar trials for the Västlänken project in Gothenburg, Sweden, a series of different single borehole ERT measurements were performed. Three cases are compared in this paper: untreated ground, treated uncured ground and treated cured ground. The raw data pseudosections show a significant general drop in resistivity between the untreated and treated uncured data sets, while the curing process increase the resistivity significantly close to the borehole. Full 3D inversions have been carried out for all three cases. In model space the cured pillar is still causing a clear increase in resistivity around the borehole, while the decrease between the untreated and uncured case is less obvious than in data space. With the large contrast between the untreated and the treated uncured in data space it was expected to be visible in model space, improved inversion methods and settings could help resolve this.},
  author       = {Olsson, Per-Ivar and Rejkjär, Simon and Dahlin, Torleif},
  language     = {eng},
  month        = {09},
  publisher    = {European Association of Geoscientists and Engineers, EAGE},
  title        = {Field-Scale Quality Control of Lime-Cement Pillar in Conductive Clay Using Electrical Resistivity Tomography},
  url          = {http://dx.doi.org/10.3997/2214-4609.201902561},
  year         = {2019},
}