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Mapping of quick clay by ERT and CPT-R in the Göta Älv River Valley
Swedish Geotechnical Institute.
2014 (English)In: Landslides in sensitive clays: From geosciences to risk management / [ed] L'Heureux, JS, Locat, A, Leroueil, S, Demers, D, Locat, J, Dordrect: Springer , 2014, p. 217-228Chapter in book (Refereed)
Abstract [en]

Within clay prone areas it is important to know if and to what extent quick clay is present. In Sweden undisturbed sampling and laboratory investigations are used to determine clay sensitivity and identify quick clay. Recent research for mapping of quick clay areas with the resistivity method is based on the fact that low pore-water salinity constitutes a criterion for quick clay formation. Electrical resistivity tomography (ERT) is an established geophysical method that provides an overview of the resistivity in large volumes, but resolution decreases rapidly with depth. CPT-R probes (Cone Penetration Test with Resistivity module) on the other hand can register the resistivity with very high resolution continuously along the probed depth. In a known quick clay area along the Göta river in Gothenburg, Sweden, both ERT and CPT-R were used to evaluate possible synergy effects when the results were combined. Field investigations comprised 11 CPT-R soundings and five parallel ERT profiles, each 400 meters long. The results gave good agreement between the methods down to depths of 10-15 meters. Below that the CPT-R probe generally registered lower values than the ERT inverted resistivity models. The results from ERT comply with the value of 6 ohmm as a lower threshold value for possible quick clay formation in Sweden. From CPT-R measurements this value was found to be approximately 3 ohmm. The discrepancy appears to be related to sulphide content and may have measurement technical explanations or be due to the differences in chemical composition. The results show that a combination of ERT and CPT-R provides an efficient approach for mapping of possible quick clay volumes. It can be an integral part of an optimized detailed geotechnical investigation program, and form a decision basis for where to do undisturbed sampling for laboratory analyses. It also opens possibilities for correlation between resistivity and mechanical parameters via the CPT-R results.

Place, publisher, year, edition, pages
Dordrect: Springer , 2014. p. 217-228
Series
Advances in Natural and Technological Hazards Research ; 36
Keywords [en]
Clay, Sensitivity, Cone penetrometer test, Geophysical investigation, Electrical resistivity, Tomography, Mapping, River, Göta älv, Sweden, Conference, Quebec, 2013, English
National Category
Geotechnical Engineering
Identifiers
URN: urn:nbn:se:swedgeo:diva-869DOI: 10.1007/978-94-007-7079-9_17Local ID: 000078218ISBN: 978-94-007-7079-9 (electronic)OAI: oai:DiVA.org:swedgeo-869DiVA, id: diva2:1364969
Note

Presented at the 1st International Workshop on Landslides in Sensitive Clays, IWLSC 2013, Quebec, Canada, October, 28-30, 2013

Available from: 2019-10-23 Created: 2019-10-23 Last updated: 2019-10-23

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