PH model: Surface heave upon excavation

In the example “Dewatered Construction of a Braced Excavation”:
The surface settlement profile:

presents 5-7mm heave on 30-80m from the excavation wall. Is this the expected behaviour in reality or just a specificity of the constitutive model ?


The Ph model with small-strain stiffness gives the closest to what is observed on the field : limited upward displacement at the ground far from the wall.

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