A Series of Centrifuge Experiments Investigating the Effect of High Confining Pressure on Sand Liquefaction

Min Ni, Tarek Abdoun, Ricardo Dobry, Waleed El-Sekelly

Research output: Contribution to journalConference articlepeer-review

Abstract

This paper introduces a series of centrifuge tests - under low and high confining pressures - designed to study the effect of effective overburden pressure on liquefaction potential of clean sand. All the centrifuge tests simulate about 5 m saturated clean sand deposit under effective overburden pressure of 1 and 6 atm with relative density ranging from 45% to 80%. To achieve the targeted overburden pressures, a dry layer of lead shots with different thickness was deposited on top of the clean sand. Viscous fluid was used for saturation to keep constant prototype permeability. All the centrifuge tests were subjected to 10-cycle sinusoidal seismic motions with different prototype peak acceleration to achieve the targeted maximum excess pore pressure buildup. Acceleration, pore pressure build-up and dissipation, and shear wave velocity were monitored, recorded, and analyzed during or after shaking. Acceleration amplification was observed in experiments conducted under low confining pressures, while de-amplification was found in experiments conducted under high confining pressures.

Original languageEnglish (US)
Pages (from-to)295-304
Number of pages10
JournalGeotechnical Special Publication
Volume2020-February
Issue numberGSP 318
DOIs
StatePublished - 2020
EventGeo-Congress 2020: Geotechnical Earthquake Engineering and Special Topics - 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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