Seismic Deformation Analyses of Seymour Falls Dam

Seymour Falls dam, which is located in a region of high seismic hazard in British Columbia, provides a safe and reliable source of quality drinking water to over two million people in the Greater Vancouver area. The dam was seismically upgraded between 2004 and 2007 to meet modern seismic standards. As part of the upgrade, a new dam was constructed immediately downstream of the existing dam on foundation soils that were improved using dynamic and explosive compaction techniques. During the design stage, extensive seismic deformation analyses were conducted using FLAC to evaluate the seismic performance of the old and the new dam and to assess the sensitivity of several key uncertainties in the design including the effectiveness of the explosive compaction technique and the residual strengths of liquefiable soils. The robustness of the new dam design under increased levels of seismic loading was also checked through these deformation analyses.

Thavaraj, T., L. Murray, N. Singh, F. Huber and M. Grant. 2012. “Seismic Deformation Analyses of Seymour Falls Dam,” in: GeoManitoba, Building on the Past, 65th Canadian Geotechnical Conference, Winnipeg, Manitoba, September 30-October 3, 2012. Toronto: Canadian Geotechnical Society.

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