The mechanism and causes of a landslide, which blocked a road to transportation and took place in 500 m NE of Ergenekon village of Serdarlı District located on the southern slopes of Beşparmak Mountain Range in Turkish Republic of Northern Cyprus, are investigated in this study. The failure surface was within the melange and resulted in buckling of the road up to 2 m. Different limiting equilibrium methods and discrete finite element method (DFEM) were used for the assessment of the slope instability. The factor of safety of the slope ranges between 1.22 and 1.26 when the slope is dry. The results showed that the slope failure may occur when the pore water pressure has a value ranging between 0.25 and 0.35. A failure surface, which is a combination of discontinuities with tectonic origin, was assumed for the stability assessment of the slope by using a pseudo-dynamic version of DFEM and the results indicated that the slope becomes unstable when pore water pressure in the slope forming material becomes 0.4.

1 Introduction

Beşparmak Mountain Range of Northern Cyprus is made up Miocene aged flysch at the bottom that was overlain by the Cretaceous aged melange. The top of the mountains are mainly composed of Jurrasic - Triassic aged limestones. A landslide occurred in the melange in Ergenekon village of Serdarlı District at 28 km northeast of Lefkoşa, Turkish Republic of Northern Cyprus (Fig. 1) and it is named as Ergenekon landslide.

The melange is composed of radiolorite, wheathered tuff, serpentinite, limestone and pillow lava. The asphalt pavement was buckled at the toe of the slope and blocked the road due to this landslide (Fig. 2). In this study, a series of stability analyses were carried out using different limiting equilibrium methods of analysis and a pseudo-dynamic version of DFEM. The results are presented and discussed.

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