Assessment of slope instability on waterfalls region in terms of engineering geology (Harbiye, Hatay)

In this study, the stability of slopes located on Harbiye Waterfalls Region of Defne District (Hatay Province) was evaluated and suitable solutions are aimed to reveal. Within the scope of thesis work, drillings, pressuremeter tests and inclinometer measurements were performed in the study area. With laboratory studies, physical and mechanical properties of soil and rock units were determined. Lithological units, in the study area where slope stability problems exist, belong to Tepehan Formation. These lithological units are silty clay and claystone. There are filling material on these units. Shear strength parameters of each unit were determined and slope analysis was performed with Slide 3D software. The analyses were carried out as three different scenarios. Both the static state and the earthquake state were calculated for each scenario. In the first scenario, the claystone parameters obtained from the direct shear test were used. In both static and earthquake conditions, the slope was determined to be unstable. In the second scenario, the claystone parameters obtained from RocData software were used. In the static situation, the slope is determined to be stable but in the earthquake conditions, the slope is determined to be in the state of limit equilibrium. In the third scenario, the claystone parameters obtained from the back analysis were used. In both static and earthquake conditions, the slope was determined as unstable. All scenarios were evaluated and it was determined, in the third scenario, the claystone parameters that are obtained from the back analysis reflect the actual conditions. Passive piles were used in slope stability improvement. The slope was stabilized as a result of improvement.