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FLIQ: Experimental Verification of Shallow Foundation Performance Under Earthquake-Induced Liquefaction

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Experimental Research in Earthquake Engineering

Part of the book series: Geotechnical, Geological and Earthquake Engineering ((GGEE,volume 35))

Abstract

The seismic performance of a square footing, resting on a liquefiable sand layer, with a non-liquefiable clay crust, is examined herein, with the aid of three centrifuge experiments. Emphasis is given on the seismic settlements of the foundation, while it is for the first time attempted to measure its (degraded) post-shaking bearing capacity, with the aid of a hydraulic piston, specially programmed to push the footing to failure, immediately after the end of shaking and before the dissipation of excess pore pressures. Aimed to examine the effect of clay crust thickness H on foundation performance, the experiments were performed for H = 2/3B, B and 5/3B, with B being the width of the footing. Following a brief presentation of the testing configuration, soil properties and excitation characteristics, the experimental results are presented and evaluated through comparison with relevant numerical and analytical predictions. Thus, the beneficial effect of the clay crust thickness H is quantitatively substantiated and the existence of a “critical clay crust thickness”, beyond which subsoil liquefaction does not deter foundation performance, is experimentally verified.

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Acknowledgements

The research leading to these results has received funding from the European Community’s Seventh Framework Programme [FP7/2007–2013] for access to the Turner Beam Centrifuge, Cambridge, UK under grant agreement n° 227887.

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Authors and Affiliations

  1. National Technical University of Athens (NTUA), Athens, Greece

    George D. Bouckovalas & Dimitris K. Karamitros

  2. University of Cambridge (UCam), Cambridge, UK

    Gopal S. P. Madabhushi, Ulas Cilingir & Stuart K. Haigh

  3. University of Thessaly (UTh), Volos, Greece

    Achilleas G. Papadimitriou

Authors
  1. George D. Bouckovalas
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  2. Dimitris K. Karamitros
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  3. Gopal S. P. Madabhushi
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  4. Ulas Cilingir
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  5. Achilleas G. Papadimitriou
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  6. Stuart K. Haigh
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Corresponding author

Correspondence to George D. Bouckovalas .

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Editors and Affiliations

  1. Joint Research Centre, ), Institute for the Protection and Security of the Citizen (IPSC), European Laboratory for Structural Assessment Unit, TP 480, European Commission, Ispra, Varese, Italy

    Fabio Taucer

  2. Joint Research Centre, Security of the Citizen (IPSC), European Laboratory for Structural Assessment Unit, TP 480, European Commission, Ispra, Varese, Italy

    Roberta Apostolska

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Bouckovalas, G., Karamitros, D., Madabhushi, G., Cilingir, U., Papadimitriou, A., Haigh, S. (2015). FLIQ: Experimental Verification of Shallow Foundation Performance Under Earthquake-Induced Liquefaction. In: Taucer, F., Apostolska, R. (eds) Experimental Research in Earthquake Engineering. Geotechnical, Geological and Earthquake Engineering, vol 35. Springer, Cham. https://doi.org/10.1007/978-3-319-10136-1_32

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