Prediction Model of Shear Wave Velocity by Using SPT Blow Counts Based on the Conditional Probability Framework

Abstract

AbstractPrediction models of shear wave velocity (Vs) based on standard penetration test (SPT) blow counts (N) are widely used in design practice. Recently, a Vs prediction model that uses multiple predictor variables (e.g., N and effective overburden stress) was suggested by several researchers to improve prediction capability. However, the application of these models to design practice is limited because calibrating the regression parameters for a site-specific condition is difficult because of multicollinearity in the model. This study describes the problem of this recently suggested Vs prediction model and proposes a calibration procedure to develop a site-specific model. The framework is based on conditional probability theory and can be applied to any site. Two application examples are presented to develop the site-specific model depending on data availabilities. The first application considers a site where only N are available from several borings, and the second application considers a site where ...