Gebze – Orhangazi Otoyolu’nun Kabaklı Heyelan Sahasındaki Şevlerinin Duraylılık Değerlendirmesi

Abstract

Transportation between two outstanding cities of Turkey in point of population, economy, education and similar issues is quite important. Existing transportation methods remain incapable with increasing technology and number of vehicles. The highway that will be constructed between these two cities, reaches İzmir by crossing a bridge on İzmir Gulf and following Orhangazi-Bursa line. The slopes between km: 21+000 – 22+700 in this highway, go through Kabaklı landslide area. For this reason, to estimate the landslide mechanism, inclinometers were installed, boreholes were drilled in specified locations, in situ tests and laboratory test were performed. Within the scope of this master thesis, 1/2000 scale geology was mapped and geolocical cross sections was drawn by considering deformation on the field, fractures in the structures and location of boreholes. Retrospective analysis was performed by using these cross sections and failure probability of highway slope profile’s different geometries (45 / 1Horizontal-1Vertical, 34 / 3Horizontal-2Vertical, 27 / 2Horizontal-1Vertical) were calculated by merging estimated all parameters. Working site, which is so close to North Anatolian Fault Zone, comes under the influence of Sapanca – Göynük – Yalova (1-2) and Geyve – İznik – Gemlik (2-3) segments. For evaluation of long-term stability of highway slope profiles, probability of earthquakes that has different moment magnitude occurence within 1 year, 5 year, 10 year, 25 year, 75 year and 100 year time zones, included to calculations. In this way failure probability of highway slope profile’s long-term stability was calculated.