A Numerical Study on the Efficiency of Jet Grout Columns in Liquefaction Mitigation

Abstract

A comprehensive site investigation was carried out on the site in Kocaeli, where a transformer assembly-disassembly building was located, and it was observed that there was liquefaction risk in the area. Therefore, jet grout columns were selected as the soil improvement method. After the production of the designed jet grout columns, it was investigated whether the liquefaction risk was eliminated through analytical and numerical analyses. The effectiveness of jet grout columns in preventing liquefaction was evaluated in terms of the generation of excess pore water pressure by using UBCSAND constitutive model on MIDAS GTS NX software which can perform effective stress-based finite element analyses. In addition, the effect of jet grout columns on the variation of shear stresses, shear deformations and excessive pore water pressure ratios in liquefiable soils were examined through the parametric analyses performed for different area and strength ratios of jet grout columns.