Site variability analysis using cone penetration test data

This paper presents a comprehensive methodology for quantification of site variability in a way that can be used in geotechnical practice. Site variability is separated into horizontal and vertical variability. To quantify vertical variability in a CPT sounding, a vertical variability index is proposed based on the complexity of the soil profile, the overall coefficient of variation for the depth range of interest, and intra-layer variability measures. To quantify horizontal site variability, a horizontal variability index is proposed based on the similarity of soundings performed at the same site. The method is illustrated using CPT data from five sites.