Shallow foundation - Soil springs

Hello, how can we neglect the soil springs between the shallow foundation and the soil beneath it in case where the foundation is sitting on piles and the design requires that all loads are transferred exclusively to the piles? If it's by defining a dummy soil the plate's interface element, what properties should it have? Can it be done by making the plate element few millimeters above the soil, hence they become contactless? 

Thank you for your valued help.

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