EGL Ref: 8983 8 October 2021 Page 20 File: TSF3 Stability Analysis Appendix Summary.docx.doc TABLE B14: COMPARISON OF MAKDISI AND SEED (1977) MAXIMUM ACCELERATION RATIOS WITH DEPTH OF SLIDING MASS TO VALUES SELECTED FOR STORAGE 1A RL182 CO-SEISMIC DISPLACEMENT ASSESSMENT y/h Makidisi and Seed (1977) Range Selected kmax_slide/kmax_crest for Storage 1A RL182 assessment 150 year R.P EQ. Kerepehi Rupture Kerepehi A.S. 10,000 year R.P EQ. 10,000 year R.P A.S. 0 to 0.33 0.62 to 1.0 1 1 1 1 1 0.33 to 0.67 0.30 to 0.90 (1+0.28)/2 = 0.64 (1+0.50)/2 = 0.75 (1+0.37)/2 = 0.69 (1+0.67)/2 = 0.84 (1+0.50)/2 = 0.75 0.67 to 1.0 0.20 to 0.62 1/3.6 = 0.28 1/2.0 = 0.50 1/2.7 = 0.37 1/1.5 = 0.67 1/2.0 = 0.50 B10. CO-SEISMIC DEVIATORIC DEFORMATIONS Co-seismic deviatoric (shear) deformation of slide masses within the embankment are estimated using the method of Bray and Macedo (2019) “Procedure for Estimating ShearInduced Seismic Slope Displacement for Shallow Crustal Earthquake”. The method is based on a fully coupled 1-dimension idealisation of slide mass response with displacement accumulated on the slide surface when the felt horizontal acceleration exceeds the pseudostatic yield acceleration of the slide mass. Application of this method for Storage 3 RL155 requires assessment of the slide mass, slide mass pseudo-static yield acceleration, and the slide mass fundamental period of resonance. The slide mass pseudo-static yield acceleration requires judgement regarding what is a realistic slide surface as pseudo-static limit equilibrium methods do not consider the complex dynamics of the system. The analysed yield surfaces are include in Appendix B in Figures B09a, B10, B11, B20, B21, B22, B31, B32, B33, B42, B43, B44, US12, US13, US14, US15. The parameter assessed and estimated co-seismic displacements are summarised in Table B15. Estimation of the period of the slide mass depends on the geometry of the mass. For circular slide masses a relationship of 2.6H/Vs is applied, where H is the overall height of the slide mass and Vs is the average shearwave velocity in the slide mass.
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