Geotechnical Inspections and Geotechnical Applications in Underground Rail System Constructions: Halkalı - İstanbul Airport Metro Line Example

In this study, geological researches carried out before the construction of underground rail systems and geotechnical application methods preferred during the construction were examined within the scope of Halkalı-İstanbul Airport metro project. The metro line consists of a total of 66.2 km long underground tunnels, 31.3×2 km main line and 1.8×2 km repertorium connection line. 1006 soil and 1230 rock samples were collected for the main line whose geological research was carried out with 198 core drillings with a total length of 9588.5 m. The results of the laboratory tests on the samples and the field tests carried out in the boreholes were obtained. In addition, a total of four two-dimensional inverted solution resistor underground sections were obtained by using the Multiple Electrode Electrical Resistance Tomography measurement method in the middle of two lines insert ignore into journalissuearticles values(Line-1 Km. 61+440 – 61 +660 /Line-2 Km: 61 +400 - 61+620);, in the Olympic Stadium station insert ignore into journalissuearticles values(Km: 62+215 – 62 +490); and in the TBM route insert ignore into journalissuearticles values(Line-2 Km: 62 +835 – 63+050);. The geological sections obtained from the drillings and the geophysical sections obtained by the electrical resistivity method were compared.