Akademik Veri Yönetim Sistemi
Jeoloji Muhendisligi Dergisi, cilt.44, sa.1, ss.67-78, 2020 (Scopus)
© 2020, TMMOB - Jeoloji Muhendisleri Odasi. All rights reserved.Determination of the natural hazard potential and possible effects on urbanization is a key factor. Landslide is the most prominent hazard in Turkey, causing adverse effects on the engineering structures and environment. This study aims to investigate the engineering geological investigation and failure criteria of the landslides which took place in Karabağlar district of İzmir. Upper Cretaceous aged Bornova Mélange is unconformably overlain by Miocene aged clayey limestone and Quaternary aged alluvium. The dimensions of the landslides were determined. A total of 52 boreholes with depths ranging between 10 m and 35 m were drilled in order to obtain the sliding depth and groundwater level. There existed 58 landslides around the southern, western and northern parts of the Şamlı hill. Landslides took place mainly in the Miocene aged clay and carbonates with gravel, sand and silt lenses. Secondary minor slides have occurred in the depletion and accumulation zones. Back analyses were conducted to attain the residual internal friction angle and residual cohesion which provided limit equilibrium. The main slide has been triggered by the minor failures which have taken place at lower elevations, being retrogressive to north. Main reasons of these slides are the road excavation at the south and carving of the creek which flows in N-S direction. Static and pseudo-static slope stability analyses were done with particular concern in the seismicity of the region. The relation between the factor of safety and pseudo-static coefficient was investigated. The pseudo-static coefficient at limit equilibrium was determined as 0.10. This value should be taken into account with peak ground acceleration for the future slope stability investigations for the study area and its vicinity.