settlement rather than an uplift movement. The

maximum and minimum principal stresses in the

embankment for the "stiff" core case are shown in

Figures 30 and 31, respectively. For both cases, the

maximum and minimum principal effective stresses

These stresses were compared with the long-term

in the upstream shell decreased due to the effect of

stresses computed using the CON2D model in Figure

submergence. The maximum principal effective

32. The results show that the stresses are nearly the

stress in the downstream shell decreased a small

same for this case. Overall, the movements in the

amount, and the minimum effective principal stress

embankment were considered small for the range of

increased during consolidation and the development

compaction conditions considered in the analysis. It

of long-term seepage in the core. As part of

was speculated that the movements would have been

another finite element calculation, the long-term

larger had the core been treated as a wetter and softer

stresses were calculated using the hyperbolic

material. Additionally, the difference between the

constitutive model under the assumption that the

long-term stresses computed with the hyperbolic

construction was slow enough so as not to induce

model and the consolidation model might also have

excess porewater pressures during the placement of

been greater for the wetter and softer core.

fill.

A-24

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