SPT-based probabilistic assessment of seismic soil liquefaction triggering

Ilgaç, Makbule
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.


SPT-based probabilistic and deterministic assessment of seismic soil liquefaction potential
Çetin, Kemal Önder; Der Kiureghian, A.; Tokimatsu, K.; Harder, L.f.; Kayen, R.e.; Moss, R.e.s. (2004-01-01)
This paper presents new correlations for assessment of the likelihood of initiation (or “triggering”) of soil liquefaction. These new correlations eliminate several sources of bias intrinsic to previous, similar correlations, and provide greatly reduced overall uncertainty and variance. Key elements in the development of these new correlations are (1) accumulation of a significantly expanded database of field performance case histories; (2) use of improved knowledge and understanding of factors affecting in...
SPT Based Seismic Soil Liquefaction Triggering Assessment
Çetin, Kemal Önder; Ilgaç, Makbule (null; 2016-09-21)
Seismic soil liquefaction has gained significance following the 1964 Niigata and Alaska Earthquakes. The topic has become a major research stream in geotechnical earthquake engineering field. A number of investigators (e.g.: Seed et. al. (1984), Liao et. al. (1988, 1998), Toprak et. al. (1999), Cetin et. al. (2004) and Idriss and Boulanger (2004, 2008, 2012)) introduced deterministic and probabilistic liquefaction triggering assessment methodologies. The scope of this study is to develop an SPT-based se...
The use of the SPT-based seismic soil liquefaction triggering evaluation methodology in engineering hazard assessments
Çetin, Kemal Önder; Kayen, Robert E.; Moss, Robb E. S.; Bilge, Habib Tolga; Ilgaç, Makbule (2018-01-01)
Probabilistic and deterministic seismic soil liquefaction triggering methodologies are proposed in Cetin et al. [1]. This manuscript: i) presents the protocols, which need to be followed for the correct use of this methodology for forward engineering (design) assessments, ii) guides the engineers through the procedure, and iii) discusses the "tricks" alongside the protocol. An illustrative soil profile shaken by a scenario earthquake is presented, through which consistent estimations of representative SPT b...
CPT-based probabilistic assessment of seismic soil liquefaction triggering relationships
Can, Gizem; Çetin, Kemal Önder; Moss, Robb Eric Shedwick; Department of Civil Engineering (2022-6)
The research aims to define possibly the most accurate and unbiased probability-based seismically induced soil liquefaction triggering relationships for cohesionless soils. One key objective is to construct a well-studied database that processes liquefied and non-liquefied case histories from seismic events up to date consistently. For that purpose, Moss et al. (2003) database is revisited with improved parameter investigation, better case history processing, and advanced regression tools. Then the final da...
Probabilistic seismic hazard assessment of Eastern Marmara and evaluation of Turkish Earthquake Code requirements
Ocak, Recai Soner; Gülerce, Zeynep; Department of Civil Engineering (2011)
The primary objective of this study is to evaluate the seismic hazard in the Eastern Marmara Region using improved seismic source models and enhanced ground motion prediction models by probabilistic approach. Geometry of the fault zones (length, width, dip angle, segmentation points etc.) is determined by the help of available fault maps and traced source lines on the satellite images. State of the art rupture model proposed by USGS Working Group in 2002 is applied to the source system. Composite reoccurren...
Citation Formats
M. Ilgaç, “SPT-based probabilistic assessment of seismic soil liquefaction triggering,” Ph.D. - Doctoral Program, Middle East Technical University, 2022.