Long term creep like Gündoğdu landslide which is moving in various annual rates along the dip direction of bedding planes of sandstone-marl layers is seen in Babadağ town of Denizli city. In this study, the sliding behavior of Gündoğdu landslide was investigated by means of laboratory tests on a slope model which was prepared in accordance with in-situ geological conditions. For this purpose, series of laboratory tests including tilting tests and dynamic shaking table tests were carried out. According to tilting test results average values of measured static and calculated kinetic friction angles were determined as 33.8° and 31.13° respectively. Recorded total AE activity for block slide in tilting and dynamic tests were determined as 3.57 for 68.4 mm and 54.2 for 101.2 mm as average values respectively. Critical acceleration values for planar sliding of upper block were determined as 0.45g and 0.22g for the dip angles 16° and 24° of sandstone and marl succession respectively. Block displacements which were developed under dynamic cyclic loads were calculated by a computer program and compared with measured displacements. If obtained critical accelerations develop in the study area in case of a possible earthquake, ongoing mechanism of the Gündoğdu landslide could be affected or triggered.

1 Introduction

Landslides are widely known major geologic hazards and threatening people all over the world. Babadağ town is located in 40 km northwest of Denizli city and it has been exposing to creep like slope movement since 1940 (Figure 1). Effects of the movement in the Gündoğdu district can be classified as; tilting and settling of the buildings, damages on buried life-line systems, deformation of roads and pavements. Moreover, crackings of walls are very typical and clearly observed.

The mechanism and factors, which contribute to the Gündoğdu slope movement, have been investigated by Tano et al. 2003; Aydan et al. 2003; Kumsar et al. 2004; Çevik 2003; Çevik and Ulusay 2005; Tano et al. 2006a; Tano et al, 2008; Çelik et al. 2011; Kumsar et al. 2012, Çelik 2012; Kumsar et al. 2016a.

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