Application of petrophysical relationships to electrical resistivity models for assessing the stability of a landslide in British Columbia, Canada

Holmes, J. and Chambers, J. and Wilkinson, P. and Meldrum, P. and Cimpoiaşu, M. and Boyd, J. and Huntley, D. and Williamson, P. and Gunn, D. and Dashwood, B. and Whiteley, J. and Watlet, A. and Kirkham, M. and Sattler, K. and Elwood, D. and Sivakumar, V. and Donohue, S. (2022) Application of petrophysical relationships to electrical resistivity models for assessing the stability of a landslide in British Columbia, Canada. Engineering Geology, 301. ISSN 0013-7952

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Abstract

Landslides in the Thompson River Valley, British Columbia, Canada, threaten the serviceability of two railway lines that connect Vancouver to the rest of Canada and the US. To minimise the impact of slope instability on vital transport infrastructure, as well as on terrestrial and aquatic ecosystems, public safety, communities, local heritage, and the economy, and to better inform decision making, there is a need for monitoring. Since 2013, the Ripley Landslide – a small, slow-moving, translational landslide – has been the focus of monitoring efforts in the Thompson River Valley transportation corridor. In November 2017, a novel Electrical Resistivity Tomography (ERT) monitoring system was installed on the site, providing near-real-time data collection via a telemetric link. 4-Dimensional resistivity models are presented in the context of moisture content and soil suction, two parameters known to influence slope stability in the Thompson River Valley. Here, we discuss the development of laboratory-based petrophysical relationships that relate electrical resistivity to moisture content and soil suction directly, building on relationships developed in the field. The 4-D ERT models were calibrated using these petrophysical relationships to provide insights into the complex spatial and temporal variations in moisture content and soil suction. This study highlights the utility of geoelectrical monitoring for assessing slope stability in the context of moisture-driven landslides.

Item Type:
Journal Article
Journal or Publication Title:
Engineering Geology
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1907
Subjects:
ID Code:
167880
Deposited By:
Deposited On:
24 Mar 2022 13:00
Refereed?:
Yes
Published?:
Published
Last Modified:
04 May 2022 02:51