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

Boyd, J. and Chambers, J. and Wilkinson, P. and Uhlemann, S. and Merritt, A. and Meldrum, P. and Swift, R. and Kirkham, M. and Jones, L. and Binley, A. (2019) Linking geoelectrical monitoring to shear strength - A tool for improving understanding of slope scale stability : 25th European Meeting of Environmental and Engineering Geophysics. In: 25th European Meeting of Environmental and Engineering Geophysics, 2019-09-08 - 2019-09-12.

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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 (

Item Type:
Contribution to Conference (Paper)
Journal or Publication Title:
25th European Meeting of Environmental and Engineering Geophysics
Additional Information:
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
Subjects:
?? electric conductivitygeologygeophysicsmoisturecoupled hydro mechanicalselectrical resistivity tomographygeoelectrical methodsgeotechnical measurementgeotechnical parametersresistivity distributionsspatial sensitivitystrength distributionlandslides ??
ID Code:
146153
Deposited By:
Deposited On:
10 Jun 2021 15:25
Refereed?:
Yes
Published?:
Published
Last Modified:
16 Jul 2024 08:04