Electrical Resistivity Imaging of Laboratory Soilcrete Column Geometry
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 142, Issue 3
Abstract
Ground improvement via jet grouting is commonly used to strengthen weak ground and/or create hydraulic barriers. Delivering soilcrete columns with tightly controlled and known diameters is critical to performance; however, techniques to assess jet grout geometry during construction are lacking. This paper reports the results of a study on electrical resistivity imaging of soilcrete by investigating the effects of electrode configuration and electrical protocol type on laboratory scale soilcrete columns constructed in a tank filled with sand. Experimental results are verified via numerical modeling and the model is used to analyze the changes in soilcrete resistivity that result from geometric variation. The results of this study indicate that resistivity imaging with direct contact electrodes can estimate the diameter of laboratory scale jet grout columns to within of the as-built column diameter. A relationship between electrode spacing and column diameter is identified and quantified to more readily extend the diameter estimation approach developed in this research to field-scale geometries. Additionally, time lapse monitoring of soilcrete resistivity was performed over the course of curing. Results indicate that resistivity imaging should be performed as early as possible to obtain the greatest resistivity contrast between the soilcrete and in situ soil.
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Acknowledgments
Funding for this study was provided by the National Science Foundation under the Partnership for International Research and Education (PIRE) Program (OISE-1243539). The authors also wish to thank Dr. Ernst Niederleithinger of the BAM Federal Institute for Materials Research and Testing, and Colorado School of Mines (CSM) student, Justin Downs, for their support and assistance in this research.
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Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 142 • Issue 3 • March 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Apr 23, 2015
Accepted: Jul 14, 2015
Published online: Nov 19, 2015
Published in print: Mar 1, 2016
Discussion open until: Apr 19, 2016
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