Probabilistic Study of SPT Liquefaction Analysis

by Carlton L. Ho, Illinois Inst of Technology, Chicago, IL, USA,
Edward Kavazanjian, Jr., Illinois Inst of Technology, Chicago, IL, USA,

Document Type: Proceeding Paper

Part of: Use of In Situ Tests in Geotechnical Engineering


The influence of earthquake magnitude upon the commonly used correlation between Standard Penetration Test (SPT) blow count and liquefaction potential is evaluated using a probabilistic model for pore pressure development during seismic loading. The analysis evaluates the probability of initial liquefaction given an event magnitude and a normalized SPT blow count. The correlation between SPT resistance, stress ratio, and magnitude is investigated by plotting contours of constant probability of initial liquefaction. The contours predicted by this proposed model is compared with the recommendations of Seed, Idriss, and Arango. Results indicate that these previous investigators may have overestimated the influence of earthquake magnitude in developing their correlation.

Subject Headings: Soil analysis | Penetration tests | Correlation | Probability | Soil liquefaction | Soil pressure | Earthquake magnitude scale | Load tests

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