In 2014, the KGS completed a monitoring project on a landslide in Boyd County. The general goals of the project were to determine the depth and shape of the sliding mass, determination of direction and velocity of sliding, monitoring groundwater conditions, collection of rainfall data, obtaining geotechnical soil properties, and measuring electrical resistivity of the slide material. The subsurface part of the investigation included the installation of six boreholes, two for slope inclinometer measurements, two for piezometers to monitor groundwater conditions, and two for downhole electrical resistivity measurements. We used a total station to monitor landslide movement on the surface.
Geologic and geotechnical data were used to characterize an active shallow colluvial landslide. Surface ER measurements across the Meadowview landslide showed distinct resistivity contrasts that correlate to borehole stratigraphy, failure surface depth, and groundwater conditions. Increases in groundwater levels correlated with particular rainfall events and continued landslide movement. This study has the potential to act as a framework for landslide hazard assessment, landslide susceptibility modeling, determining risk, and prevent future losses in Kentucky.
For more information contact Matt Crawford.