Probabilistic Solution for Seismic Sliding Displacements of Slopes - August 26

Presented by:  Ali Fallah Yeznabad, M. Sc., Ph.D. Candidate in Geotechnical Engineering Civil and Environmental Engineering Department Western University, London, ON, Canada

Seismic stability of slopes across the Lower Mainland BC is investigated using the probabilistic solution of the Newmark sliding block analogy. Different seismicity sources in the region and the latest updates in sliding displacement prediction models are considered to present the probabilistic solution for the displacement of slopes from west to east of the Lower Mainland. Displacement seismic hazard curves are output from the probabilistic evaluation of the problem, which is presented and evaluated for a 2% probability of exceedance in 50 years hazard level based on the National Building of Canada.

The current procedure for seismic slope evaluation in Greater Vancouver is reviewed and critiqued with an illustrative example and the alternative probabilistic method is recommended for engineering practice. The current pseudo-probabilistic practice for earth-fill dams and slopes can result in an unconservative solution where the simplified probabilistic approach improves this procedure with rational consideration of earthquake scenarios and in a time-efficient way.

 

 

 

Top 3 Lessons:

• Benefit of using Newmark sliding block analogy for local seismicity
• Best methods and improvements of the probabilistic approach
• Example application for the probabilistic-based design of slopes and earth-fill dams

 

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