An initiative to correlate the SPT and CPT data for an alluvial deposit of Dhaka city

Abstract

The Standard Penetration Test (SPT) is the most common in-situ tests for soil investigations. On the other hand, the Cone Penetration Test (CPT) is considered one of the best investigation tools. Many CPT-SPT correlation relationships have been proposed worldwide to estimate soil parameter from the other's available data. However, unfortunately, no available SPT-CPT correlations are established for the alluvial soil of Dhaka city. This paper aims at presenting correlations among the SPT-N value, cone tip resistance (qc), sleeve friction resistance (fs), soil behavior index (Ic) and mean particle size (D50) for an alluvial soil deposit of Dhaka city. It is found that for the relationship between equivalent SPT N60-value and SPT N60-value the coarser soil layers As1 and As2 show the coefficient of correlation (R2) is 0.7106 and 0.534 respectively, which indicate a reliable relationship. In addition, the correlation between cone tip resistance (qc) and SPT N60-value shows very strong relationship which is very similar to proposed Meyerhof correlation. Furthermore, the relations between other mentioned parametres also shows a valid correlations similar to other authors.