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Linking geoelectrical monitoring to shear strength - A tool for improving understanding of slope scale stability: 25th European Meeting of Environmental and Engineering Geophysics

Research output: Contribution to conference - Without ISBN/ISSN Conference paperpeer-review

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Publication date30/09/2019
Number of pages5
Pages1-5
<mark>Original language</mark>English
Event25th European Meeting of Environmental and Engineering Geophysics - The Hague, Netherlands
Duration: 8/09/201912/09/2019
https://www.earthdoc.org/content/proceedings/25th-european-meeting

Conference

Conference25th European Meeting of Environmental and Engineering Geophysics
Abbreviated titleEMEEG '19
CountryNetherlands
CityThe Hague
Period8/09/1912/09/19
Internet address

Abstract

Landslides pose a risk to both infrastructure and wider society, managing the geohazard requires and understanding of factors driving slope instability, in particular the response to moisture content. Traditional methods of slope investigation involve discrete point geotechnical measurements which are not spatially sensitive. Recent studies have shown the spatial sensitivity of geoelectrical methods to both the internal geometry of unstable hill slopes and moisture dynamics, demonstrating their value in landslide investigation and characterisation. In this study we present the use of a geoelectrical monitoring system on an active landslide in Lias mudrocks, North Yorkshire, UK. Building on previous studies of the field site, subsurface resistivity distributions determined from time-lapse electrical resistivity tomography (ERT) are converted into shear strength estimates through calibration between electrical resistivity and matrix suction. Geotechnical parameters are determined from shallow borehole samples. Shear strength distributions show agreement with field observations of the slope, relatively low shear strength values (

Bibliographic note

Conference code: 160826 Export Date: 30 July 2020 Correspondence Address: Boyd, J.; British Geological SurveyUnited Kingdom Funding details: National Eye Research Centre, NERC Funding text 1: We would like to thank NERC and ENVISION DTP for funding parts of this work. References: Archie, G. E., Electrical resistivity an aid in core-analysis interpretation (1947) AAPG Bulletin, 31 (2), pp. 350-366; Crawford, M. M., Bryson, L. S., Assessment of active landslides using field electrical measurements (2018) Engineering Geology, 233, pp. 146-159; Fredlund, D., Morgenstern, N. R., Widger, R., The shear strength of unsaturated soils (1978) Canadian geotechnical journal, 15 (3), pp. 313-321; Gasmo, J. M., Rahardjo, H., Leong, E. C., Infiltration effects on stability of a residual soil slope (2000) Computers and Geotechnics, 26 (2), pp. 145-165; Kuras, O., Pritchard, J. D., Meldrum, P. I., Chambers, J. E., Wilkinson, P. B., Ogilvy, R. D., Wealthall, G. P., Monitoring hydraulic processes with automated time-lapse electrical resistivity tomography (ALERT) (2009) Comptes Rendus Geoscience, 341 (10), pp. 868-885; Merritt, A. J., Chambers, J. E., Murphy, W., Wilkinson, P. B., West, L. J., Gunn, D. A., Meldrum, P. I., Dixon, N., 3D ground model development for an active landslide in Lias mudrocks using geophysical, remote sensing and geotechnical methods (2014) Landslides, 11 (4), pp. 537-550; Merritt, A. J., Chambers, J. E., Wilkinson, P. B., West, L. J., Murphy, W., Gunn, D., Uhlemann, S., Measurement and modelling of moisture - electrical resistivity relationship of fine-grained unsaturated soils and electrical anisotropy (2016) Journal of Applied Geophysics, 124, pp. 155-165. , (Supplement C); Uhlemann, S., Chambers, J., Wilkinson, P., Maurer, H., Merritt, A., Meldrum, P., Kuras, O., Dijkstra, T., Four-dimensional imaging of moisture dynamics during landslide reactivation (2017) Journal of Geophysical Research: Earth Surface, 122 (1), pp. 398-418; Uhlemann, S., Hagedorn, S., Dashwood, B., Maurer, H., Gunn, D., Dijkstra, T., Chambers, J., Landslide characterization using P- and S-wave seismic refraction tomography - The importance of elastic moduli (2016) Journal of Applied Geophysics, 134, pp. 64-76. , (Supplement C); Uhlemann, S., Wilkinson, P. B., Chambers, J. E., Maurer, H., Merritt, A. J., Gunn, D. A., Meldrum, P. I., Interpolation of landslide movements to improve the accuracy of 4D geoelectrical monitoring (2015) Journal of Applied Geophysics, 121, pp. 93-105. , (Supplement C); Varnes, D. J., Slope movement types and processes (1978) Special report, 176, pp. 11-33