A 3 m × 3 m pad footing supports a reinforced concrete column delivering a characteristic vertical load of N_k = 1400 kN (dead) + G_k = 380 kN (imposed) on a sandy clay subsoil. Ground water table is at 2.0 m below ground level. EC 7-1 DA3 partial factors applied. Determine drained and undrained bearing resistance, check settlement, and confirm footing dimensions are adequate.
| Footing plan | 3.0 m × 3.0 m |
| Footing depth | Df = 1.5 m below GL |
| Soil type | Sandy clay (γsat = 19 kN/m³) |
| Effective friction φ’ | φ’ = 28° |
| Undrained cu | cu = 55 kPa |
| Saturated γ | 19.0 kN/m³ |
| GWL depth | 2.0 m bGL |
| N_k (dead) | 1400 kN |
| Q_k (imposed) | 380 kN |
| γ_G | 1.35 (DA3) |
| γ_Q | 1.50 (DA3) |
| Check | Status | Util. | Value |
|---|---|---|---|
| Drained bearing capacity — DA3 | PASS |
|
R/d = 2622 kN ≥ N_d = 2466 kN |
| Undrained bearing (short-term) — DA3 | PASS |
|
R/d = 1485 kN ≥ N_d = 1200 kN |
| GWL correction (EN 1997-1 §6.5.2) | PASS |
|
GWL at 0.5 m below base — reduction applied |
| Eccentricity check | PASS |
|
e = 80 mm ≤ B/6 = 500 mm |
| Settlement — immediate | PASS |
|
δ_i = 18 mm ≤ 25 mm (SLS) |
| Settlement — consolidation | PASS |
|
δ_c = 12 mm — primary compression layer |
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