Volume 2, Issue 2 — Year 2025 — Article e100047

Naser Nourani¹; Akbar Ghazifard²

1. Department of Geology, Shiraz Payam Noor University, Shiraz 1743638565, Iran
2. Department of Geology, University of Isfahan, Isfahan 8174673441, Iran

In geotechnical engineering, the correlation between Standard Penetration Test (SPT) and Cone Penetration Test (CPT) values plays a crucial role in soil characterization. This study focuses on developing new empirical relationships based on SPT and CPT values in the fine-grained riverside alluvium of the Karrizak Formation in Tehran, southern Alborz, Iran. SPT-CPT data were extracted from various previous studies, encompassing diverse geological and geotechnical investigations. By analyzing these datasets, we identified patterns and trends that allowed us to establish improved correlations between SPT and CPT values with soil properties of this formation. Our approach integrates both statistical and empirical methods to ensure that the proposed relationships accurately reflect the mechanical behavior of the fine-grained alluvium in the study area. The developed correlations provide a more reliable framework for geoengineers and researchers working on subsurface investigations and foundation design in similar geological settings. These findings contribute to enhancing the predictive capabilities of geotechnical assessments and improving the overall reliability of soil parameter estimations.

SPT-CPT correlation, fine-grained alluvium, Kahrizak Formation, geotechnical engineering, Tehran