In this study the applicability of the electric resistivity tomography and the CPTR-bore logging method was studied in geotechnical soil investigations. Also the induced polarisation effect is discussed. Usually the geotechnical soil investigations utilize lots of drillings and the number of them is set in advance. The aim of this study was to show that by using the ERT-measurements the number of the bore loggings could be diminished and they could also be situated in the most relevant places. <br> <br>The most important conclusions drawn from the results are that the ERT-method is very useful in geotechnical soil investigations. Also the IP effect gives information on the quality of different soil types. The CPTR gives the point like value of the resistivity of the ground which is important in evaluating the corrosion risk for steel structures. Together with ERT –measurements the CPTR loggings can be very informative about the depth of peat and clay layers. <br>


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