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1 INTRODUCTION

It can be useful sometimes to create an idea on how the CPTU measurement points of a particular site or soil unit are distributed among different SBT (Soil Behavior Type) zones. I wrote a small function to categorize CPTU data points according to the zone they plot in a few SBT charts, as listed:

2 PLOTS

Some example plots with sample data are shown below.

2.1 Robertson 2009

ALL ZONES

Same plot for all SBT zones:

SEPARATED

Separated plots for each SBT zone:

2.2 Robertson 2016

ALL ZONES

Same plot for all SBT zones:

SEPARATED

Separated plots for each SBT zone:

2.3 Schneider et al. 2008 (modified Robertson 2016)

ALL ZONES

Same plot for all SBT zones:

SEPARATED

Separated plots for each SBT zone:

  1. Robertson, P.K. 2009. Interpretation of cone penetration tests - a unified approach. Canadian Geotechnical Journal, 46(11), pp.1337-1356.↩︎

  2. Robertson, P.K., 2016. Cone penetration test (CPT)-based soil behaviour type (SBT) classification system—an update. Canadian Geotechnical Journal, 53, pp.1910-19277.↩︎

  3. Schneider, J. A., Randolph, M. F., Mayne, P. W., & Ramsey, N. R., 2008. Analysis of factors influencing soil classification using normalized piezocone tip resistance and pore pressure parameters. Journal of Geotechnical and Geoenvironmental Engineering, ASCE. 134(11), pp. 1569-1586.↩︎