On the Reliability of SPT-N as an Indication of Consistency of Clayey Soils


Işık Yılmaz

Department of Geological Engineering, Cumhuriyet University, Sivas, Turkey
e-mail: iyilmaz@cumhuriyet.edu.tr


Yusuf Erzin

Department of Civil Engineering, Cumhuriyet University, Sivas, Turkey
e-mail: erzin@cumhuriyet.edu.tr



Investigation of the shear strength properties and consistency distributions of the clayey alluviual soils of the Niksar basin located at the right bank of the Kelkit River and evaluation of the shear strength of the clays, and correlation of them with the consistency characteristics obtained from SPT-N values from Standard Penetration Tests is aimed in this study. Investigations of the study were programmed consisting the Standard Penetration Tests in field and index and shear strength tests in the laboratory. Obtained undrained shear strength values indicates the stiff consistency and also classification due to the obtained blow count from SPT in the same levels gives the same consistency properties, and the determination of the consistency of clayey soils by SPT-N value is very reliable. Constructed section by using the SPT results from 24 boreholes 15 m in depth along the Niksar basin showed the widespread distribution of the clayey soils with stiff consistency.

KEYWORDS: Alluvial soils, clay, consistency, shear strength, standard penetration test

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