Numerical Analysis and Assessment of Centrifuge Modeled Soil Liquefaction of a Level Site Subjected to Biaxial Dynamic Base Excitation

Omar El Shafee, Mourad Zeghal, Tarek Abdoun

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

Abstract

The paper presents a series of centrifuge tests of level sites consisting of a granular soil deposit, with and without an embedded structure subjected to various biaxial and uniaxial base excitations. The tests were conducted at RPI NEES centrifuge facility to assess the dynamic response characteristics of level deposits with and without an embedded structure under multidimensional conditions. Synthetic sinusoidal waves were used as base excitations to test soil models under biaxial and uniaxial shaking. A dense array of accelerometers was used to monitor the deposit response along with pore water pressure transducers. Two uniaxial tests and three biaxial shaking tests were conducted on three similar soil models, to study the effect of multidirectional shaking on the generation of soil liquefaction for loose and dense deposits. The observed acceleration and pore pressure are used along with non-parametric identification procedures to evaluate the corresponding dynamic shear stress-strain histories. The measured results along with the obtained time histories are used to shed light on the mechanisms of liquefaction occurring through the stratum under multiaxial shaking. It also shows the effect of soil relative density on soil behavior when subjected to biaxial shaking. The soil structure interaction (SSI) test showed significant differences in soil behavior at different locations beneath the footing when subjected to biaxial shaking. This difference is associated with coupling in stress-strain in both experiments compared to the more known uniaxial soil behavior.

Original languageEnglish (US)
Title of host publicationGeotechnical Special Publication
EditorsEllen Rathje, Brina M. Montoya, Mark H. Wayne
PublisherAmerican Society of Civil Engineers (ASCE)
Pages334-343
Number of pages10
EditionGSP 338
ISBN (Electronic)9780784484654, 9780784484661, 9780784484678, 9780784484685, 9780784484692, 9780784484708
DOIs
StatePublished - 2023
Event2023 Geo-Congress: Sustainable Infrastructure Solutions from the Ground Up - Geotechnics of Natural Hazards - Los Angeles, United States
Duration: Mar 26 2023Mar 29 2023

Publication series

NameGeotechnical Special Publication
NumberGSP 338
Volume2023-March
ISSN (Print)0895-0563

Conference

Conference2023 Geo-Congress: Sustainable Infrastructure Solutions from the Ground Up - Geotechnics of Natural Hazards
Country/TerritoryUnited States
CityLos Angeles
Period3/26/233/29/23

ASJC Scopus subject areas

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

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