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A new approach to determine the diameter of a jet grouted column using seismic methods

  • Jet grouting is a geotechnical method of ground improvement to increase shear strength and stiffness of soils. The method is typically used to construct in-situ geometries of grouted soil such as panels or columns. The diameter of grouted columns and its material strength depend on various process parameters and the subsurface soil properties. It is only vaguely possible to predict the final column diameter. Therefore, it is a general practice to excavate a test column and perform a visual examination. However, an excavation to control the in situ diameter is often impossible, especially under complex site conditions, such as a high ground water table. Therefore, as part of a research project, borehole seismic measurements (crosshole, downhole and tomography) were tested as a quality control to verify the extent of the column and to monitor the influence of the jet grout injection on the soil over time. The field surveys were conducted before and after the jet grouting process atJet grouting is a geotechnical method of ground improvement to increase shear strength and stiffness of soils. The method is typically used to construct in-situ geometries of grouted soil such as panels or columns. The diameter of grouted columns and its material strength depend on various process parameters and the subsurface soil properties. It is only vaguely possible to predict the final column diameter. Therefore, it is a general practice to excavate a test column and perform a visual examination. However, an excavation to control the in situ diameter is often impossible, especially under complex site conditions, such as a high ground water table. Therefore, as part of a research project, borehole seismic measurements (crosshole, downhole and tomography) were tested as a quality control to verify the extent of the column and to monitor the influence of the jet grout injection on the soil over time. The field surveys were conducted before and after the jet grouting process at different time intervals. The acquired seismic data show clear traveltime differences which allow the determination of the specific column depth and diameter. The tomogram measured in the natural soil and the tomograms of the measurements after the injection process were used to visualize the time dependent effects of the jet grout injection on the soil.zeige mehrzeige weniger

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Metadaten
Autor*innen:S. Mackens, T. Fechner, N.I.C. Rios, D. Tweeton, Julio Cesar Galindo Guerreros, Ernst NiederleithingerORCiD
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Graue Literatur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):SAGEEP 2015 - 28th Symposium on the application of geophysics to engineering and environmental problems (Proceedings)
Jahr der Erstveröffentlichung:2015
Herausgeber (Institution):Environmental and Engineering Geophysical Society
Erste Seite:142
Letzte Seite:146
Freie Schlagwörter:Column diameter; Diameter; Grouted column; Jet grouting; Quality assurance; Seismic tomography
Veranstaltung:SAGEEP 2015 - 28th Symposium on the application of geophysics to engineering and environmental problems
Veranstaltungsort:Austin, TX, USA
Beginndatum der Veranstaltung:22.03.2015
Enddatum der Veranstaltung:26.03.2015
DOI:10.4133/SAGEEP.28-021
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Nein
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