The Assessment of Seismic Liquefaction Triggering of Gravelly Soils

Date

2023-6

Author

Şahin, Arda

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Gravelly soils had been considered to be non-liquefiable due to their high capacity for pore pressure dissipation, resulting from their larger grain size. Case histories from recent earthquakes have produced the evidence that gravelly soils are susceptible to seismic soil liquefaction triggering. Even though one of the first case histories for gravelly soil liquefaction was dated back to 1964 Alaska Earthquake, significant number of gravelly soil liquefaction case histories were reported during 2008 Wenchuan Earthquake. Within the scope of this thesis, available gravelly soil liquefaction case histories are compiled and assessed leading to a high quality database, where the resistance term is selected from site investigation index measures of Standard Penetration Test (SPT) blowcounts, N1,60, Cone Penetration Test (CPT) tip resistance, qc, shear wave velocity, Vs, Dynamic Penetration Test (DPT) blowcounts, N120, etc. Due to limited number of case histories with other site investigation indices, the resulting database included only the case histories with N120 and/or Vs. The database summarizes the significant parameters including effective grain sizes (D50 and D30) along with the gravel content (GC) by dry mass for the identified critical layer. In order to estimate the Peak Ground Acceleration (PGA) values, ShakeMaps, in conjunction with site amplification factors, are used. The resulting database is used to develop a reliability-based models for the assessment of seismic liquefaction triggering of gravelly soils.

Subject Keywords

Liquefaction, Gravelly soils, Earthquake, Dynamic Penetration Test

URI

https://hdl.handle.net/11511/104490

Collections

Graduate School of Natural and Applied Sciences, Thesis