Landslide stabilization in weathered tuffite, northern Turkey

Avşar, Özgür
A landslide occurred during the construction of the Giresun ا Espiye road between Km: 1+030 ا 1+170 in April 2003. Investigating the causes and mechanism of this slope failure along with suggesting a proper stabilization technique is aimed in this study. For that purpose, a detailed site investigation study, including engineering geological mapping, drilling work, in situ and laboratory tests, was performed. Weathered tuffite, tuffite, flysch and dacitic tuffite, from top to bottom, are the major units in the study area. A أtranslational slideؤ occurred in completely weathered tuffite owing to the disturbance of the stability of the slope by the excavations performed at the toe of the slope; particularly the foundation excavation for the restaurant building and for the road cut for the Giresun ا Espiye road. After establishing the model of the landslide in detail, shear strength parameters of the failure surface were determined by the back analysis method as "cohesion"=2.5 kN/m2 and "friction angle"=9°. Toe buttressing, ground water and surface water drainage options were considered for stabilizing the slope. For the back analysis calculations, the Morgenstern-Price and Spencer methods were used with the aid of the SLOPE/W computer program.


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An embankment slope on a major highway totally collapsed during 12 November 1999 Duzce earthquake (M-w = 7.1) due to the intense near field ground motion. The slope had performed satisfactorily, without even minor deformations or cracks, during the Izmit earthquake (M-w = 7.4), another major event that occurred 3 months before and was far field. Predominantly coarse-grained fill of the embankment exhibited typical non-brittle behavior during laboratory tests, implying that the prefailure shear strength woul...
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During the road extension works of the Tarsus - Çamlıyayla Provincial Road at KM: 11+640 -12+080, a landslide occurred due to the construction of a steeper slope at the road side for wall construction. The purpose of this thesis is to determine the critical failure location of the landslide and to determine the necessary slope stabilization methods in order to prevent the development of a larger potential landslide that may occur in the future. For this purpose, necessary engineering geological in-situ and ...
Engineering geological and geotechnical site characterization and determination of the seismic hazards of Upper Pliocene and Quaternary deposits situated towars the west of Ankara
Koçkar, Mustafa Kerem; Akgün, Haluk; Department of Geological Engineering (2006)
The purpose of this study is to assess the engineering geological and geotechnical characteristics and to perform seismic hazard studies of the Upper Pliocene and Quaternary deposits located towards the west of Ankara. Based on a general engineering geological and seismic characterization of the site, site classification systems are assigned for seismic hazard assessment studies. The objective of the research is to determine the regional and local seismic soil conditions, predominant periods and ground ampl...
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Erol, O; Ozkeskin, A (2001-08-31)
The construction of two 40m high embankments on Izmir-Cesme Motorway was completed in 1992. 20m high-reinforced earth walls supported the downstream slopes of the embankments. Highly weathered clayey schists excavated from adjacent cuts were used in the construction of both the embankments and reinforced earth walls. Continuous vertical deformations were observed on the embankments that reached to 70cm in 1998. Lateral displacements at the crest of walls were in excess of 60cm. These magnitudes of deformati...
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Kaven, Hassan Zehtab; Yılmaz, Mustafa Tolga; Department of Engineering Sciences (2010)
Among the hard-hit cities during 17 August 1999 Kocaeli Earthquake (Mw 7.4), Adapazarı is known for the prominent role of site conditions in damage distribution. Since the strong ground motion during the event was recorded only on a rock site, it is necessary to estimate the response of alluvium basin before any study on the relationship between the damage and the parameters of ground motion. Therefore, a series of site and laboratory tests were done on Adapazarı soils in order to decrease the uncertainty i...
Citation Formats
Ö. Avşar, “Landslide stabilization in weathered tuffite, northern Turkey,” M.S. - Master of Science, Middle East Technical University, 2004.