Static and dynamic analysis of torpedo anchor penetration and pullout in cohesive soils

Abdelaziz Ads, Mehdi Omidvar, Stephan Bless, Magued Iskander

Research output: Contribution to journalConference articlepeer-review


This paper investigates the mechanics of torpedo-anchors' soil interactions in a transparent synthetic surrogate for marine clay, during both embedment and extraction. Both free falling and quasi-statically advanced torpedo anchors were included to cover a range of rates spanning three orders of magnitude (V/D of 0.2-200 s-1, where V is penetration velocity, and D is torpedo diameter). Impact velocities in the range of 5.0 m/s were investigated. Digital image correlation (DIC) was employed to analyze images of penetration and pullout, captured at a framerate that permitted quantifying incremental displacements. Penetration resistance was found to depend on nose shape. Two nose shapes were studied, and hemispherical noses engendered larger resistance than conical ones; however, shaft resistance is higher behind conical noses, so the combined effect on penetration of a full torpedo is minimal. Resistance in quasi-static pull out tests was the same as in quasi-static penetration tests.

Original languageEnglish (US)
Pages (from-to)283-292
Number of pages10
JournalGeotechnical Special Publication
Issue numberGSP 317
StatePublished - 2020
EventGeo-Congress 2020: Modeling, Geomaterials, and Site Characterization - Minneapolis, United States
Duration: Feb 25 2020Feb 28 2020

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology


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