1024 Figure 78 – Degree of Saturation and Pore Water Pressure in the Saturated-Unsaturated Model (external face covered during wet season) It can be observed that the negative pore water pressures generated in the model reach a maximum suction value of approximately -2200 kPa at the end of the FTD operational stage. This suction governs the variation in the degree of saturation according to the SWCC of the materials, thereby allowing this transition to be captured in the model. In contrast, the only saturated model, a more pronounced piezometric level is observed within the FTD. Since this model does not account for changes in permeability or degree of saturation as a function of suction (negative pore water pressure), it assumes that the material below the piezometric level is 100% saturated, whereas the material above it is considered “dry.” Figure 79 – Piezometric line and Pore Water Pressure in the Only Saturated Model
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