SPT-based probabilistic assessment of seismic soil liquefaction triggering

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2022-6-09

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Ilgaç, Makbule

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The in-situ tests are proven to be a reliable approach to assessing the resistance against seismic soil liquefaction triggering. The scope of this research is to enrich previous SPT-based databases with new case histories from events that occurred in the last 25 years and employ an updated processing perspective with a new set of parameters and correction terms. The new SPT-based liquefaction triggering field case history database is based upon a large field case history from seismic events between 1964 and 2018. The suite of 334 case histories covers normal, reverse, and subduction zone events with site-specific event term parameters presented individually. The critical layers are composed of occasional gravelly and silty critical layers in addition to sandy layers, which enables the introduction and the assessment of new and/or updated corrections schemes (fines correction, etc.). The database documents the available case history data consistently with ongoing CPT and Vs case history data processing. Site response analyses are conducted to estimate the PGA and rd, when possible. An updated set of factors is used for the correction of SPT N values. The updated database is used to develop a probabilistic model for liquefaction triggering. The resulting relationships provide an updated understanding of the effects of durational, overburden stress, and fines corrections.

Subject Keywords

Liquefaction, Earthquake, Standard penetration test, Site response

URI

https://hdl.handle.net/11511/98169

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

M. Ilgaç, “SPT-based probabilistic assessment of seismic soil liquefaction triggering,” Ph.D. - Doctoral Program, Middle East Technical University, 2022.