Assessment of structure-induced liquefaction triggering


Unutmaz B., ÇETİN K. Ö.

Geotechnical Earthquake Engineering and Soil Dynamics IV Congress 2008 - Geotechnical Earthquake Engineering and Soil Dynamics, Sacramento, CA, United States Of America, 18 - 22 May 2008 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.1061/40975(318)78
  • City: Sacramento, CA
  • Country: United States Of America

Abstract

Although there exists some consensus regarding seismic soil liquefaction triggering assessment of free field soil sites, assessing liquefaction triggering potential beneath building foundations still stays as a controversial and a difficult issue. Liquefaction triggering potential under building foundations is affected by both the static and cyclic stress state of the soil medium. As part of these studies, conventionally used normalized cyclic demand term, cyclic stress ratio corrected for Kα and K α effects adjacent to and under building foundations are to be estimated. For this purpose series of 3-D numerical simulations have been performed for a number of generic soil-structure systems. A representative CSR value, CSRSSEI,rep varying with depth was defined, which has potential use in assessing liquefaction-induced bearing capacity failures. Then a simplified, semi empirical procedure was recommended for the estimation of CSRSSEI,rep values which was further calibrated through the results of 3-D numerical simulations. Good match between the predictions of the recommended semi-empirical procedure and the results of numerical simulations are concluded to be convincing and promising for the assessment of liquefaction triggering potential for foundation soils. © 2008 ASCE.