| Sr. No | Assumptions | Rankine’s theory | Coulomb’s wedge theory |
| 1. |
Soil mass |
Homogeneous, semi-infinite |
homogeneous, isotropic and ideally plastic |
| 2. |
Backfill |
Dry and cohesionless |
Dry and cohesionless |
| 3. |
Back of the wall |
Smooth and vertical |
Rough and inclined |
| 4. |
Miscellaneous |
The soil element is in state of plastic equilibrium, i.e in the verge of failure |
The sliding edge itself acts as a rigid body, i.e the equilibrium of the whole of the material |
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