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Assessment of slope stability for km: 109+590-128+630 segment of Kırıkkale-Yerköy section (section-2) of Ankara-Sivas high speed railway project

Atar, Elif
Ankara-Sivas High-speed Railway Project is planned to be a part of an arterial railroad that will cross Turkey from west to east. Some slope instability problems occured after the excavation along Kırıkkale-Yerköy section of the project. Purpose of this study is to investigate engineering geological properties of the İncik formation exposed at four cut slopes with failure along the Kırıkkale-Yerköy section, to designate the factors that overbalance the stability of cut slopes and to recommend remedial solutions for problematic sections. In line with this purpose, shear strength parameters (c’ and φ’) of the İncik formation are investigated by back analysis method at four cut slopes KM:109+590, KM:113+120, KM:121+200 and KM:128+630 of Kırıkkale-Yerköy Section of Ankara-Sivas High-Speed Railway Project. As a comparison, shear strength parameters of the cut slopes were also checked against a neighbouring stable cut slope KM:107+100. According to the slope stability analyses based on limit equilibrium methods, the most assuring solution technique for the failed cut slopes is found out to be piling solution at various levels of the slopes depending on where the highest force of the slices exists. Additionally, the slope at KM:107+100 where a transition zone between the İncik formation and the competent İç Anadolu Group exists is expected to be stable in the long term due to higher mass shear strength parameters of the units.