TABLE B7: GEOTECHNICAL STABILITY SUMMARY SECTION 1 – UP SLOPE Stability Analyses Strength Parameters Figure Slide Surface Result Comment Static max operation – peak drained strength conditions Stockpile and foundation Drained strength parameters applied using effective stresses based on excess porewater pressures due to fill placement. B16 Stockpile FOS=3.44 Above FOS = 1.5. Criteria met. Static max operation – peak undrained strength conditions Stockpile and foundation Combination of drained and undrained parameters applied using effective stresses based on excess porewater pressures due to fill placement. B17 Stockpile FOS=2.17 Above FOS = 1.5. Criteria met. Post-earthquake max operation – Undrained conditions Stockpile and foundation Combination of drained and post-earthquake softened undrained parameters applied using effective stresses based on excess porewater pressures due to fill placement. B18 Stockpile FOS=1.56 Above FOS = 1.2. Criteria met. EQ max operation 1 in 150 year embankment response Stockpile and foundation Combination of drained and post-earthquake softened undrained parameters applied using effective stresses based on excess porewater pressures due to fill placement. Post-earthquake strength applied from for assessment of yield acceleration B19 Full embankment ky = 0.1g < 0.5 to 1cm See Table B11 for seismic parameters used for determining co-seismic deformations. Displacements are minor. Upslope profile will be depleted in closure, removing the potential for upslope displacement under earthquake shaking. EQ max operation 1 in 2500 year embankment response B19 Full embankment ky = 0.1g 6 to 25 cm
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