This paper presents the principles, procedures and technologies adopted for the design and execution of the Multi-Purpose Bottom Plug (MPBP). This original geotechnical engineering solution has been employed for the deep basement excavation in Karakoy, within the scope of the Galataport Project, Istanbul, Turkey. MPBP consists of a combination of seepage control, ground improvement and load-bearing elements, which have been executed with double-fluid jet grouting, pseudo-elliptical jet grouting and permanent micropiles, respectively. Three-dimensional dynamic analyses, using the new P2PSand-3D constitutive model implemented in FLAC3D, were carried out to evaluate the performance of liquefaction hazard mitigation. The paper highlights the importance of employing advanced geotechnical analysis and design software, cutting-edge technologies within the foundation engineering field and state-of-the-art electronic control devices, in parallel with essential human expertise, in order to obtain the desired results in this high-profile project.
