Geological and geotechnical investigation of the Çorlu (Karaisalı/Adana) landslide

The landslide that occurred in Hüsür Mevkii near the Çorlu Village of Karaisalı District in January 2019 is the subject of this study.The studies were first started in the field, the current map of the landslide was made and the dimensions of the sliding mass were revealed. It has been determined that the movement occurred within the Cingöz Formation is a planar type movement with a N60°W strike and a 10° SE dip. Disturbed and undisturbed samples were taken from the field to be used in laboratory studies and the geotechnical characteristics of the Cingöz Formation, in which the landslide developed, were determined. In line with the data obtained from the field, the data obtained from the laboratory studies were evaluated and the necessary data for the office studies were provided, and the breaking envelope of the Cingöz Formation, in which the landslide developed, was obtained by performing shear box experiments on the undisturbed samples taken from the field. The formation mechanism of landslides and their effects on the environment were investigated by supporting the office studies with computer programs and drawings. The cohesion and internal friction angles that caused the landslide were determined by back analysis with the limit equilibrium method.The obtained data indicate that the landslide occurred in January 2019 due to the precipitations above the seasonal norms, as a result of the units becoming saturated with water, the increase in pore water pressure, as well as the decrease in the effective stress, the presence of claystone-sandstone alternation on the sliding mass, the layer strike and slope direction and tension cracks, has also shown to play an important role. In addition, when the 2014 history of Google Earth image is examined; It was observed that trees were cut and vegetation was removed in the landslide area, and it was thought that this situation might be among the triggering factors in the slip effect.