GEOPHYSICAL AND IN-SITU INVESTIGATION TO DETERMINE THE SLIDING SURFACE

Abstract

The purpose of the research is to gain insight into the composition of the soil and the geotechnical characteristics of the soil in the area of the landslide and to determine the depth of the sliding surface. Landslides represent a severe problem today, so adequate field research is of great importance to determine the cause of the landslide and the remedial solution. This paper presents 2D profile models of landslides based on geophysical and In-situ research methods. The paper describes, presents and interprets the results of field investigations of landslides at two locations, in Samarica and Petrovsko. Among the geophysical methods, geoelectrical tomography (ERT), multichannel analysis of surface waves (MASW) and seismic refraction (SRS) were performed. In-situ tests included static probing with a cone penetrometer (CPTu), flat Marchetti dilatometer (DMT) and dynamic probing with a light impact probe (DPL). The analysis showed excellent complementation and overlapping of geophysical and In-situ methods results. Exploratory drilling is a direct research method; it is costly and time-consuming, and only point data is obtained. The results of exploratory drilling in the area of the Samarica landslide showed a good correlation with the results of geophysical and in-situ tests. However, field investigations without the use of exploratory drilling in the area of the Petrovsko landslide proved to be very successful in detecting the depth of the sliding surface. After the research, remedial solutions were proposed.