DBPapers
DOI: 10.5593/sgem2012/s02.v2010

ELECTRICAL RESISTIVITY IMAGING (ERI) INVESTIGATIONS TO IDENTIFY SOIL PROFILE AROUND NECATIBEY SUBWAY STATION, ANKARA, TURKEY

O. AKTURK, V. DOYURAN
Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 2, 71 - 78 pp

ABSTRACT

In this study, multi electrode resistivity method was applied in order to identify soil
profile around Necatibey Subway Station of Kizilay-Cayyolu metro line, Ankara,
Turkey. The Necatibey Metro Station is located within the alluvial deposits of Dikmen
stream and the so-called Ankara clay. At the metro station a number of boreholes were
drilled. However, due to the spacing of the boreholes the boundary between alluvium
and Ankara clay deposits could not be separated precisely. Thus, electrical resistivity
studies have been planned for the delineation of the boundaries of the two deposits.
For every measurement section, Schlumberger N6-Dipole Dipole N4, Dipole Dipole
N6, Schlumberger N6 and Wenner Alpha arrays were used. Measured data were
interpreted by using RES2DINV software and correlated with borehole logs. According
to resistivity sections taken from the location of Necatibey Station, silty clay and
gravelly sand units which belong to Dikmen stream channel deposits, as well as fill
material overlying and clayey levels which belong to Ankara clay underlying these units
were identified. Based on borehole logs and resistivity data 3-dimensional lithological
subsurface model of the survey area is constructed. The resultant 3-dimensional
diagrams may serve engineers as a practical tool while considering construction stages,
groundwater-structure interactions within short and long term, and probable remedial
measures.

Keywords: multi-electrode resistivity profile, two-dimensional resistivity survey, 3-
dimensional subsurface model, Necatibey subway station