A cantilever retaining wall to scale with Rankine earth pressure, sloping backfill, surcharge and groundwater. Drag the water table and watch the pressure diagram, thrust, bearing pressure and the sliding, overturning and middle-third checks respond — and the wall fail when it should.
Change the wall height, base, toe, heel, shear key, soil strength and groundwater level and watch the earth and water pressure diagrams, factors of safety against sliding and overturning, and bearing pressure update on a to-scale section.