read the result
Make the pressure diagram explicit.
For the stated Rankine active case, soil self-weight produces a triangular lateral-pressure distribution and a uniform surcharge produces a rectangular component. The tool reports both components so the resultant and its height above the base remain inspectable.
Governing equation
Ka = (1 − sin φ)/(1 + sin φ). The soil thrust is Pγ = ½KaγH², the surcharge thrust is Pq = KaqH, and the total thrust is Pa = Pγ + Pq.
The relationship is consistent with the Rankine active coefficient and horizontal stress form shown in FHWA guidance.
Keep stability wider than the thrust.
- Check wall self-weight, base width, eccentricity, bearing, sliding, overturning, drainage, uplift, and structural reinforcement separately.
- Include groundwater, hydrostatic pressure, seepage, sloping backfill, layered soil, cohesion, wall friction, seismic effects, and compaction where relevant.
- Confirm whether active pressure is justified; rigid or restrained walls may require at-rest or another project-specific pressure model.