My model predicts heave in areas away from a vertical load. Is this expected?
Heave may be predicted in areas away from a vertical load. The extent depends on the rigid boundary level, the load value and the soil properties. Below are two screenshots from a simple model of a rectangular load on a single layer of soil. Small (to -8mm) heave occurs away from the load, but much larger (to 160mm) downward displacement occurs beneath and immediately around the load.
Small values of heave in areas away from the load:
Downward movement beneath and immediately around the load:
The Mindlin and Boussinesq methods that PDisp uses may predict such patterns.
If a load is applied to an elastic block of material sitting on a rigid base then heave could result in areas away from the load.