TY - CONF A1 - Mackens, S. A1 - Fechner, T. A1 - Rios, N.I.C. A1 - Tweeton, D. A1 - Galindo Guerreros, Julio Cesar A1 - Niederleithinger, Ernst T1 - A new approach to determine the diameter of a jet grouted column using seismic methods T2 - SAGEEP 2015 - 28th Symposium on the application of geophysics to engineering and environmental problems (Proceedings) N2 - 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 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. T2 - SAGEEP 2015 - 28th Symposium on the application of geophysics to engineering and environmental problems CY - Austin, TX, USA DA - 22.03.2015 KW - Jet grouting KW - Grouted column KW - Column diameter KW - Seismic tomography KW - Quality assurance KW - Diameter PY - 2015 DO - https://doi.org/10.4133/SAGEEP.28-021 SP - 142 EP - 146 AN - OPUS4-33678 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -