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LANDSLIDE FAILURE SURFACE CHARACTERIZATION USING A COMBINED APPROACH OF GEOTECHNICAL AND GEOPHYSICAL SURVEYS
Abstract
Pre-failed landslides occurring in quasi-homogeneous soils are difficult to be characterized from the standpoint of their partially formed failure surface geometry. The paper presents the combined geotechnical investigation methods (fully sampled boreholes with laboratory tests, in-situ dynamic probing and so on) giving a very accurate point-wise description of the soil, with geophysical methods (electric resistivity tomography пїЅ ERT, seismic refraction and multichannel analysis of surface waves пїЅ MASW) providing less accurate, yet continuous lithological information. The various data obtained using the herein before mentioned methods is doublechecked and summarized in a three dimensional geological model that is numerically analysed for obtaining an accurate description of the instability phenomenon. The classical approach where limited morpho-lithological information is available may provide input only for simplified numerical models such as two dimensional analyses, sometimes even employing obsolete methods such as limit equilibrium, while the availability of the full subsoil picture renders possible complex studies simulating ground water flow, progressive failure of the soil and so on.
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