Abstract
Quick-clay landslides are a known hazard in formerly glaciated coastal areas. Some of Norway’s most densely populated areas are located in potential quick-clay zones and, hence, large efforts are devoted to map the distribution of quick clays. Here, we focus on one particular Norwegian site (Hvittingfoss, 100 km south-west of Oslo), which was remediated against potential sliding in 2008. A set of geophysical methods including Electrical Resistivity Tomography, P-wave seismic refraction tomography, S-wave seismic reflection profiling, and Ground Penetrating Radar, were jointly analysed and complemented with laboratory data and in-situ geotechnical measurements (i.e., CPTU, SCPTU and RCPTU) in order to establish a suitable, integrated and multi-disciplinary approach to map the extent of the quick-clay zone. Through careful integration and interpretation of the different data, the main deposits were identified. Both the clay deposit and the overlying sand layer were precisely imaged and their lateral variations were determined. The underlying moraine deposit and the bedrock were also identified, thereby yielding an idea of the preferential leaching paths. Considering the inherent complexity of quick-clay mapping, the collected data illustrate the benefit of an integrated approach, and emphasise the need for high resolution, proper imaging, calibration and ultimately joint inversion of the different data.
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Acknowledgments
The authors are grateful to Ranajit Ghose for reviewing this paper. The authors also thank Gedco and Sandmeier for providing academic licences (Vista and ReflexW, respectively). The authors acknowledge Nadège Langlet, Sylvain Tissot, Christian Maskrey, Håkon Akerholt, Tor Overskeid, Karine Petrus, Mesay Geletu Gebre, Gunther Druivenga and Berit Paulsen for their help in the field, and the University of Oslo for some of the equipment. Guillaume Sauvin thanks the sponsors of his Ph.D. thesis: the Norwegian Public Roads Administration, the Norwegian National Railway Administration, the Norwegian Water Resources and Energy Directorate and International Centre for Geohazards.
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Sauvin, G., Lecomte, I., Bazin, S., L’Heureux, JS., Vanneste, M. (2014). Geophysical Data Integration for Quick-Clay Mapping: The Hvittingfoss Case Study, Norway. In: L'Heureux, JS., Locat, A., Leroueil, S., Demers, D., Locat, J. (eds) Landslides in Sensitive Clays. Advances in Natural and Technological Hazards Research, vol 36. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-7079-9_18
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DOI: https://doi.org/10.1007/978-94-007-7079-9_18
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