Özen barajı (Hafik) Dolusavak güneyindeki heyelanların jeolojik incelemesi

Abstract

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Recently, numerous landslides occurred in the southem part of the ÖzenDam (Sivas-Turkey) threatening the spillway. Kinematical ana]yses showed thatthe potential slope instability direction is NW corresponding to the dominantslope directions. Geotechnieal surveys eonfirmed the rock slopes are highly proneto instability, and failures occurred in the Iimits between basement rock and debrismaterial in the alteration zone as a planar surface. Pre-ex:isting failures,excavations in the toe of the slopes, low quality of the basement rock unit,saturation of the earth material on the s]ope causing an increase of the waterpressure, high slope grade s and highway works on the crown part of the landslidesincreased the driving forees and decreased the resisting forces. Some stabilizationmethod s would be useful to deerease the resisting forces and increase the drivingforces, such as; to control of the surface mn-off and groundwater level by surfacedrain, to change the grade of the slope, buttresses at the toe between slope withspillway wall.