1023 • Saturation condition: The basal drain and filtered tailings materials exhibit unsaturated behavior at the time of their placement in the FTD. Table 19 - Constructions stages Lift DSTF Height (m) Season Rainfall time (days) Start End Nivelation 25 Wet / Dry 0 910 Lift 1 35 Wet / Dry 910 1502 Lift 2 45 Wet / Dry 1502 1980 Lift 3 55 Wet / Dry 1980 2468 Lift 4 65 Wet / Dry 2468 3089 Lift 5 75 Wet / Dry 3089 3552 Lift 6 85 Wet / Dry 3552 3915 Lift 7 95 Wet / Dry 3915 4178 Post Construction 95 Wet / Dry 4178 5475 4. RESULTS AND DISCUSSIONS The seepage analysis results indicate that, throughout the life cycle of the dam and during the construction process, a piezometric level develops within the FTD. However, the influence of considering unsaturated behavior, by implementing the soil-water characteristic curve (SWCC) as a key parameter, can be observed in Figure 77 and Figure 78, with degrees of saturation exceeding 85% in some zones. Figure 78 highlights the importance of covering the structural zone of the filtered tailings deposit during the wet season. In this case, a significant increase in saturation zones is observed during the construction stage, with degrees of saturation exceeding 85% on the downstream face of the filtered tailings deposit. Figure 77 – Degree of Saturation and Pore Water Pressure in the Saturated-Unsaturated Model (external face uncovered during wet season)
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