EGL Ref: 8983 8 October 2021 Page 1 APPENDIX B EMBANKMENT STABILITY CALCULATIONS B1. PURPOSE Assess the proposed profile for geotechnical stability. B2. OBJECTIVES 1. Select geotechnical strength parameters for each material for the different loading cases. Consider peak drained strengths, peak undrained strengths, residual undrained strengths. 2. Consider operational and long term closure stability cases. 3. Assess stability for Sections 1 and 2 shown in plan on Drawing 0513 and cross section in Drawing 0516 and 0517. 4. Apply Morgenstern and Price stability calculation method with half sine interslice pressure distribution. 5. Review stability against NZDSG criteria for stability. B3. STABILITY ASSESSMENT The following strength parameter sets have been selected for Storage 3 stability. TABLE B1: HOEK ROCK MASS STRENGTH RELATIONSHIP PARAMETERS Rock Strength Structure Surface Condition c (MPa) mi mb/ mi s a Rhyolite W blocky/ seamy Fair 5 16 .12 .001 .5 c – uniaxial compressive strength TABLE B2: DUNCAN FILL STRENGTH RELATIONSHIP PARAMETERS Fill Relative Density Dr A B C D Std dev. Percentile Duncan Gravel/Cobbles with Cu>4 16%ile 0.85 44 10 7 2 3.1 16%
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