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

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

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.

Details

Authors
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Geotechnical Engineering
Original languageEnglish
Title of host publicationProceedings of the 1st Conference on Geophysics for Infrastructure Planning, Monitoring and BIM
PublisherEuropean Association of Geoscientists and Engineers, EAGE
Publication statusPublished - 2019 Sep 1
Publication categoryResearch
Peer-reviewedYes
EventNear Surface Geoscience 2019 - 1st Conference on Geophysics for Infrastructure Planning, Monitoring and BIM -
Duration: 2019 Sep 82019 Sep 12

Conference

ConferenceNear Surface Geoscience 2019 - 1st Conference on Geophysics for Infrastructure Planning, Monitoring and BIM
Period2019/09/082019/09/12