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Instrumentation and Real Time Monitoring of a Landslide on Highway No. 302 Near Prince Albert, Saskatchewan


Saskatchewan Department of Highways and Transportation (SDHT) implemented a Risk Management System for the provincial highway network in 2003. The Risk Management System was developed to prioritize sites for investigation and allocate resources for construction and maintenance. The Risk Management System identified a section of Provincial Highway No. 302, approximately 4.5 km west of Prince Albert, Saskatchewan, as an urgent site requiring immediate investigation and monitoring. As of April 2006, a 420 m of the highway was dropping as a result of large retrogressive landslides along the North Saskatchewan River. Investigation and slope stability analysis indicated the remediation options were limited to the re-alignment of the highway. However, re-alignment of the highway would be costly and require time to design and construct. Daily inspection and monitoring of the site instrumentation were recommended until remedial measures could be implemented but the remote location of the site and high speed of landslide movement were not amenable to traditional means of inspection and monitoring. As a result, an automated real time monitoring and warning system was installed in the summer of 2005. Data was collected by data loggers and transmitted by cell phone modem to a server where the data was uploaded to the ARGUS Monitoring Software System on the internet. Data provided by the instrumentation included the movement at the shear zone (at the river bank and at the highway), piezometric pressures (above, below and at the shear zone at both monitoring locations), the depth of water in the river together with atmospheric pressure and temperature at each sensor location. Alarm levels for the data were set so that risk on the impacted section of highway could be managed until remedial measures were enacted. This paper documents the site conditions and how the real time monitoring system has assisted in characterizing the landslide movement and managing risk at the site.

Conference Paper Details

Session title:
Widger, A
Antunes, J
Kelly, A.J
Vu, H.Q
Clifton, A,W