This looks like there's some permanent displacement in the soil, possibly due to non-linearity. In DRM/ESI, all non-linearity must be inside the soil-structure interface, as we would need to do a static analysis first. The card INTERFACE_SSI_STATIC is used to capture the static reactions in the static analysis, for later application in the transient analysis to support the static load and isolate the PML from static stress.
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