Landslide hazard assessments are best accomplished by a multidisciplinary approach that connects geologic processes with geotechnical behavior. Tools to accomplish this in the field include geologic characterization, hydrologic monitoring, and geophysical surveys, and in the laboratory, soil-strength testing. Volumetric water content, soil-water potential (suction), local rainfall, and in situ electrical conductivity were measured at a shallow colluvial landslide in Kentucky. Surface electrical-resistivity surveys were also conducted to support interpretations of depth to failure, lithologic differences, and changes in moisture content over time. Correlations of hydrologic data with electrical measurements and shear strength indicate that observed changes in the degree of saturation and soil-water potential for colluvial soils can be detected from inverted electrical-resistivity survey data. Subsurface electrical measurements, which are functions of moisture content and water potential, can be used to determine shear strength. Long-term observation data were used to develop a technical framework to assess landslide hazard and slope stability.
Report of Investigations 1
Digital Object Identifier (DOI)
Crawford, Matthew M. and Bryson, L. Sebastian, "Field Investigation of an Active Landslide In Kentucky: A Framework to Correlate Electrical Data and Shear Strength" (2017). Kentucky Geological Survey Report of Investigations. 4.