Preventing tunnel flotation due to liquefaction

B. Schmidt, Y. M.A. Hashash

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The mechanism of flotation of a buried structure due to liquefaction of the surrounding soil requires 1) the liquefaction of most or all of the ground surrounding the structure, 2) the structure is buoyant in the liquefied mass, 3) no foundations or hold-down installation prevents flotation, 4) the liquefied soil mass is free to flow under the structure as the structure floats. Traditional means include prevention of liquefaction by soil improvement or other means, or holding the structure in its place by structural means. In this paper explores prevention of the flow of liquefied soil under the structure, using the isolation principle. Walls are built around the structure to prevent the flow under the structure and maintain the in situ total stress under the structure unchanged. Reconsolidation of the liquefied material under the structure can, however, result in post-earthquake settlements.

Original languageEnglish (US)
Title of host publicationEarthquake geotechnical engineering. Proceedings of the 2nd international conference on earthquake geotechnical engineering, Lisbon, June 1999. (3 vols.).
EditorsP.S. Seco e Pinto, P.S. Seco e Pinto
PublisherA. A. Balkema
Number of pages4
ISBN (Print)9058091163
StatePublished - 1999
Externally publishedYes
EventProceednings of the 2nd international conference on earthquake geotechnical engineering 1999. - Lisbon, Portugal
Duration: Jun 21 2099Jun 25 2099


OtherProceednings of the 2nd international conference on earthquake geotechnical engineering 1999.

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)


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