The emperor's new clothes - opportunities and limitations applying AEM to geotechnical design work

Andi A Pfaffhuber; Helgard Anschütz; Kristoffer Kåsin

doi:10.1071/ASEG2016ab208

25th International Conference and Exhibition – Interpreting the Past, Discovering the Future

ISSN: 2202-0586
E-ISSN:

oa The emperor's new clothes - opportunities and limitations applying AEM to geotechnical design work
Authors Andi A Pfaffhuber^a, Helgard Anschütz^b and Kristoffer Kåsin^c
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^a NGI Pty Ltd, 77 St Georges Ter., Perth, , WA, 6000, [email protected] ^b NGI Sognsv. 72, NO-0855, Oslo, [email protected] ^c NGI Sognsv. 72, NO-0855, Oslo, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2016, Issue 25th International Conference and Exhibition – Interpreting the Past, Discovering the Future, Dec 2016, p. 1 - 5
DOI: https://doi.org/10.1071/ASEG2016ab208
- Published online: 01 Dec 2016

Abstract

In summer 2015, we acquired close to 6.000 km of Helicopter, time-domain airborne electromagnetic (AEM) data for regional geotechnical mapping for the Norwegian National Rail Administration. This survey and further experience from related Norwegian road planning projects demonstrated the unprecedented accuracy of modern AEM data. The extent of geotechnical site investigations can be drastically reduced, both in terms of time schedule, and costs if AEM derived bedrock models are included when soil investigations are planned. Geotechnical projects demand high resolution (meter scale) and AEM data is to some extent capable of delivering that. Some of our data matched the resolution of corresponding ground geophysics data. Here we present the way in which AEM can be used as bedrock models, sensitive clay delineation and to determine bedrock types. Our discussion leads us to the missing link between high vertical resolution in the first tens of meters for geotechnical work and the focus on simple, sub-vertical structures in exploration AEM. Ultimately, we should strive for the best of both worlds, shouldn't we?

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2016-12-01

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References

Anschutz, H., Bazin, S., Kasin, K., Pfaffhuber, A. A., and Smaavik, T. F., 2016a, Airborne sensitive clay mapping - stretching the limits of AEM resolution and accuracy: Near Surface Geophysics, submitted.
Anschutz, H., Voge, M., Bazin, S., Sauvin, G., Lysdahl, A. O., Pfaffhuber, A. A., and Berggren, A. L., 2016b, From manual to automatic AEM bedrock mapping: Journal of Environmental and Engineering Geophysics, submitted for Airborne Geophysics special issue.
Baranwal, V. C., Dalsegg, E., Dretvik, H., Renning, J. S., Tennesen, J. F. and Solberg, I. L., 2014, Delineation of clay layers in a landslide area in Norway using frequency domain helicopterborne EM survey: Near Surface 2014, Athens, Greece, Expanded Abstract, We Olym 06
Christensen, C. W., Pfaffhuber, A. A., Anschutz, H. and Smaavik, T. F., 2015, Combining airborne electromagnetic and geotechnical data for automated depth to bedrock tracking: Journal of Applied Geophysics 119 179-191, doi:10.1016/j.jappgeo.2015.05.008.
Fullagar, P,. Reid, J., and Pears, G., 2015, Rapid 3D inversion of airborne TEM data from Forrestania, Western Australia: ASEG extended abstracts doi:10.1071/ASEG2015ab120
McMillan, M. S., Oldenburg, D. W., Haber, E., Schwarzbach, C., and Holtham, E., 2015, 3D Multiple Body Parametric Inversion of Time-domain Airborne EM Data: 1st European Airborne Electromagnetics Conference, Torino, Italy, Expanded Abstracts, doi: 10.3997/2214-4609.201413870
Remoen, M., Pfaffhuber, A. A., Karlsrud, K., Helle, T. E., 2010, Resistivity on marine sediments retrieved from RCPTU-soundings: a Norwegian case study: International symposium on cone penetration testing, 2, CPT'10, Huntington Beach, CA. Proceedings 2, 289-296
Viezzoli, A., Munday, T., Auken, E., and Christiansen, A. V., 2010, Accurate quasi 3D versus practical full 3D inversion of AEM data - the Bookpunong case study: Preview 23-31.

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Article Type: Research Article

Keyword(s): AEM; Engineering; Geotechnical; Inversion; Near Surface

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Abstract

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