Soils, surcharge and parameters¶
The three soils¶
| Soil | Parameters | Role |
|---|---|---|
| Reinforced (structural fill) | γt, φt, δ (soil-reinforcement friction) | internal actions and weight of the structure |
| Retained (behind the block) | γt, φt, c′ | active thrust (Coulomb, δ = ⅔φ) |
| Foundation | γt, φt, φf, c′ | sliding and bearing capacity |
The sliding friction coefficient fb = tan δ / tan φt is kept in sync with δ (a typical conservative value is 0.6).
Surcharge¶
A load strip on the backfill, defined by q [kN/m²] and the abscissas xin/xfin measured from the top vertex. The stress increment on the reinforcements is evaluated with Boussinesq.
The surcharge type drives the combination factors:
| Type | γQ static | ψ₂ seismic |
|---|---|---|
| Permanent structural | 1.3 | 1.0 |
| Permanent non-structural | 1.5 | 1.0 |
| Dense crowd | 1.5 | 0.6 |
| Road traffic | 1.5 | 0.0 |
| Railway | 1.5 | 0.0 |
| Buildings | 1.5 | 0.3 |
Site coordinates¶
Latitude, longitude and elevation appear in the report header and are filled in automatically when you import a GeoStru PS report.
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