Comparison of Liquefaction Potential Evaluation based on SPT and Energy methods in Tabriz metro line 2

Abstract

One of the important problems in earthquake geotechnical engineering is liquefaction phenomenon that happens in loose saturated granular soils. This phenomenon can cause great damages to underground structures and buildings and lifelines. Liquefaction resistance of soils can be evaluated by experimental and field tests. The use of energy is a logical step in the evaluation of liquefaction assessment methods. Main ideas this method is included: firstly effect of different parameters in liquefaction potential of soils be determined. Secondly, reliability of results as an affecting parameters in engineering decisions obtained. In this research results of two liquefaction potential methods based on standard penetration test (SPT) and energy were compared. Case study area is Tabriz Metro Line 2 with 22km length and 54 boreholes was collected. With considering type of soils and ground-water table level liquefaction potential evaluated. Then, liquefaction potential index (LPI) assessed. Results of this study showed that there is no suitable accordance between two processes. Moreover, energy method proposed higher liquefaction potential hazard than SPT. Major Factor affecting in un matching can be explained such as distance of Tabriz Metro Line 2 to Tabriz north fault, epicenter position and assumption of correction factors in SPT method.