Open image in new windowFiber Optic Strain Monitoring and Evaluation of a Slow-Moving Landslide Near Ashcroft, British Columbia, Canada
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Landslides in British Columbia are costly geological hazards that have challenged the major rail companies for over 120 years. Presented here are preliminary results and analyses of fiber Bragg grating and Brillouin optical time domain reflectometry monitoring of a deforming trackside lock-block retaining wall on the Ripley Slide in the Thompson River valley south of Ashcroft, British Columbia. Fiber optic strain data are evaluated in the context of results from global positioning system monitoring, field mapping and electrical resistivity tomographic survey across the landslide. This research aims to reduce the economic, environmental, health and public safety risks that landslides pose to the railway network operating in Canada and elsewhere.
KeywordsRailways Ripley Slide British Columbia fiber Bragg grating Brilllouin optical time domain reflectometry Global positioning system Electrical resistivity tomography
The project has benefited from management by Carmel Lowe, Adrienne Jones and Philip Hill (GSC Sidney, British Columbia); and Merrina Zhang (Transport Canada, Ottawa, Ontario). ERT, EM, GPR, seismic surveys and geophysical data modelling was completed by Neil Parry, Megan Caston, Cassandra Budd and Gordon Brasnett (EBA-Tetratech, Edmonton, Alberta). The following colleagues contributed on site and in the office: Lionel Jackson (GSC Vancouver, British Columbia); Renato Macciotta and Hengxing Lan (University of Alberta, Civil and Environmental Engineering, Edmonton, Alberta); and Ian Chadwick (ERD Consulting Ltd., Kamloops, British Columbia). Field safety was ensured by Gary Maximiuk and Roy Olsen (CPR) and Jennifer Kutchner and Mark McKay (CN).
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