Abstract
Geotechnical investigations of landslides for future mitigation are a complex task. To obtain relevant information, various geophysical methods are used, with varying degrees of success. The geoelectrical scanning method, also known as Electrical Resistivity Tomography (ERT) has been successfully applied in several locations in Serbia in the las three decades. The geoelectrical scanning method was used during investigations of landslides: Umka, Lukovska banja, Tara, and Trandžament, while both geoelectrical scanning and Ground Penetrating Radar (GPR) were utilized at the Trandžament landslide. The achieved results from both methods are mutually correlated at the Trandžament landslide. Correlation of GPR data with geoelectrical scanning data was only possible since there were no nearsurface low resistivity zones in the Trandžament landslide body. Otherwise, electromagnetic signal attenuation would be high in the presence of near-surface low resistivity zones, and a quality signal would be impossible to detect at the receiving antenna.
Highlights
Landslides are a phenomenon that can be categorized in a variety of ways, the most common being according to landslide activity, rate of movement, water content, material and type of movement [8]
Further surveys in the Neogene sediments enabled the discovery of two forms of landslides - Landslides on the right riverbank of the Sava and Danube River and, landslides in Central Serbia [1]
In this study are presented results of two well-known geophysical methods already applied on aforementioned landslides: Electrical Resistivity Tomography (ERT) and Ground Penetrating Radar (GPR)
Summary
Landslides are a phenomenon that can be categorized in a variety of ways, the most common being according to landslide activity, rate of movement, water content, material and type of movement [8]. The first aspect can be subdivided into a unique slide surface or a zone with several sliding surfaces, while the second one is based on the physical and mechanical properties of the sliding mass, sliding surface, bedrock and groundwater distribution. Further surveys in the Neogene sediments enabled the discovery of two forms of landslides - Landslides on the right riverbank of the Sava and Danube River and, landslides in Central Serbia (inland Neogene) [1]. Landslides on the right riverbank of the Sava and Danube River are formed in clay and marl weathering zones and slide over undisturbed sediments. The Umka landslide is one of the most representative landslides that form on the right riverbank of the Sava and Danube River [1]. The second type of landslide is distinguished by significant variations in composition, physical, and mechanical properties between the sliding mass and the bedrock. The consolidated bedrock, which is mainly made up of crystalized slates, limestones, and flysch (landslides „Tara“ and „Lukovska banja“), slides over the clay mass, which includes more or less fragments of the bedrock [7]
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