M. Khalili Noutash - M. Sc. of Soil and Foundation Engineering, Zanjan Branch, Islamic Azad University, Zanjan, Iran.
R. Dabiri - Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran
M. Hajialilue Bonabc - Department of Civil Engineering, Tabriz University, Tabriz, Iran.

The liquefaction resistance of soil can be evaluated using laboratory tests such as cyclic simple shear, cyclic triaxial, cyclic torsional shear as well as field methods like Standard Penetration Test (SPT), Cone Penetration Test (CPT) and Shear Wave Velocity (Vs). In this regard, this study attempts to compare the results of the SPT based on the simplified procedure proposed by Seed and Idriss (1985) and those of the Vs on the basis of Andrus et al.’s (2004) process using empirical relationships between them. Iwasaki’s (1982) method is used to measure the liquefaction potential index for both of them. The study area is a part of the south and southeast of Tehran. It is observed that there is not a perfect agreement between the results of the two methods based on five empirical relationships assuming cemented and non-cemented condition for soils. Moreover, the liquefaction potential index (PL) value in the SPT method is more than that of the Vs method.

Liquefaction, Standard Penetration Test (SPT), Shear Wave Velocity (Vs), Liquefaction Potential Index (PL), South of Tehran