Landslide characterization and hazard assessments require multidisciplinary approaches that connect geologic processes with geotechnical parameters. Preexisting landslide activity, geology and geomorphology, soil strength, and hydrologic conditions are complex factors that affect landslide behavior. Often, the connections among these factors are not made for hazard assessments, forecasting, or slope stability modeling. Therefore, geophysical and geotechnical techniques for landslide investigations are typically assessed independently. This study aims to bring together different techniques to develop a methodology that connects electrical measurements and shear strength. A framework has been developed for using electrical resistivity measurements that will support and facilitate the prediction of shear strength within a slope. In-situ volumetric water content, soil-water potential (suction), and electrical conductivity were measured from two shallow colluvial landslides in Kentucky. Repeated surface electrical resistivity survey measurements were used to characterize the failure zone and lithology, and to compare with the in-situ hydrologic measurements. The data show that subsurface moisture conditions over time can be reflected in the inversions of repeated ER surveys, thus allowing electrical measurements and geotechnical parameters to be correlated. This study demonstrates that electrical resistivity can be used as a tool for landslide monitoring and to assess shear strength. These parameters are pertinent to investigating the stability of landslides that are often triggered or reactivated by rainfall.
|Number of pages||14|
|State||Published - Jan 31 2018|
Bibliographical noteFunding Information:
The authors would like to thank the Kentucky Geological Survey for the financial and logistical support. We would also like to thank Dr. Edward Woolery of the University of Kentucky Earth and Environmental Sciences Department and Dr. Zhenming Wang of the Kentucky Geological Survey for technical suggestions and support. Special thanks is due to Francis Ashland of the U.S. Geological Survey Landslide Hazards program. His support and technical advice regarding landslide monitoring and field instrumentation was invaluable.
© 2017 Elsevier B.V.
Copyright 2018 Elsevier B.V., All rights reserved.
- Electrical resistivity
- Shear strength
- Slope stability
- Soil mechanics
ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology