Slope stability assessment of a re-activated landslide on the Artvin-Savsat junction of a provincial road in Meydancik,
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ORIGINAL PAPER
Slope stability assessment of a re-activated landslide on the Artvin-Savsat junction of a provincial road in Meydancik, Turkey Ebru Topsakal & Tamer Topal
Received: 19 May 2013 / Accepted: 18 November 2013 # Saudi Society for Geosciences 2014
Abstract The purpose of this study is to determine the most suitable remediation techniques for an active landslide area in Turkey, using a geological engineering assessment of a re-activated landslide that occurred during the construction of the Artvin-Savsat Junction on the Meydancık Provincial Road, at Km: 12+200. For this, the geotechnical parameters of the mobilized geological material—which is colluvium along the sliding surface— were determined by back analyses of the landslide at three geological sections. The landslide was then modeled along the most representative section of the study area by considering its mechanism, the parameters determined from the geotechnical investigations, the size of the landslide, and the location of the slip circle. In addition, pseudo-static stability analyses were performed comprising the earthquake potential of the site. The most suitable slope remediation technique was decided using the surface and subsurface conditions. The shear strength parameters were specified as c =0 kPa and ϕ=10° for the landslide material and pre-stressed anchoring was considered as a remediation method.
Keywords Colluvium . Back analysis . Finite element . Landslide . Remediation . Artvin . Turkey
Introduction Artvin-Savsat junction of a provincial road in Meydancik (Turkey) was planned with a wider road in 2009 and to be completed at the end of year 2013. During road construction, a landslide occurred at Km: 12+200 and its activity continued for several months. The causes of this landslide were investigated in order to be able to recommend suitable mitigation methods. The study area is located approximately 15 km from the northwestern part of the Savsat District of Artvin and 800 m to the northeast of Sebzeli village. The landslide area is located 12.20 km away from the Artvin-Savsat Junction, on the Meydancık Provincial Road which extends parallel to Meydancık Creek.
Site characteristics and geological setting
E. Topsakal PETRA Mühendislik Müs. ve İns. Ltd. Şti, Gökkuşağı Mah., 1222. Cad., 1204. Sok., No:8, Balgat, Ankara, Turkey T. Topal (*) Department of Geological Engineering, Middle East Technical University, 06800 Ankara, Turkey e-mail: [email protected]
In the study area (Fig. 1), cold winters and light summer rains are observed. The maximum precipitation, mainly in the form of rain and rarely of snow, may be observed between December and January. Based on the meteorological data for the last 42 years, the average annual precipitation is 716.8 mm. The study area is located at topographic elevations between 980 and 864 m. The slopes in the close vicinity of the landslide
Arab J Geosci
Study Area
Fig. 1 Location map of the study area
area generally range between 5° and 35°, despite the fact that head of the landslide is almos
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