Use of shear wave velocity in evaluation of soil layer’s condition after liquefaction

Document Type: Original Article

Authors

Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.

10.22034/jcema.2019.94190

Abstract

After liquefaction occurrence, summits on the surface of the earth and inside the soil layers that damage the structures based on them or buried structures and vital arteries. In the last two decades, various quasi-experimental methods have been presented to determine the amount of strain (siting) and shear strain maximum based on field data and laboratory data. The main purpose of this study was to compare the results of evaluation of the potential of liquefaction occurrence from the viewpoint of the risk of occurrence and the amount of settling after the occurrence of liquefacti  on in the soil layers based on the use of the results of the standard penetration resistance (SPT) and shear wave velocity (Vs) along the path 2nd line of Tabriz metro. In this study, 54 borehole loops were first collected along the line 2 of the metro mentioned. Then, the liquefaction potential in the studied area is based on the proposed methods and the liquefaction risk index (LPI) is estimated. Then, the amount of probable sum of the soil layers due to liquefaction occurred based on the results of the two proposed methods. The results of the research show that the two methods are not suitable for matching and the risk of liquefaction arising from the SPT method is less than the Vs method. Also, the prediction of the amount of settling after the occurrence of liquefaction in the soil layers has more amount based on the shear wave velocity method in comparison with the standard penetration resistance test method.

Keywords