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Terzaghi, Meyerhof & Skempton Methods | IS 2950:1981 | Bearing Capacity & Settlement Analysis
🏗️ Foundation Design Calculator
Based on Terzaghi, Meyerhof & Skempton Methods | IS 2950:1981 | Shallow Foundation Design
Shallow Foundation Bearing Capacity Settlement Check IS Code Compliant
📊 1. Load & Foundation Data
🧪 2. Soil Properties
📈 3. Bearing Capacity Results
Method Used:
Terzaghi Method
Failure Mode:
General Shear
Net Ultimate Bearing Capacity (qₙᵤ):
0 kN/m²
Safe Bearing Capacity (qₛ) with FOS=3:
0 kN/m²
Applied Net Pressure:
0 kN/m²
✅ Safe Design
📉 4. Settlement Analysis
Immediate Settlement (Elastic):
0 mm
Permissible Settlement Limit:
40 mm
Settlement Status:
✅ Within Limit
📋 IS Code Recommendation:
Isolated footing on sand: 25-40 mm settlement allowed
🏆 5. Foundation Recommendation
Based on your input:
- ✓ Isolated footing is suitable
- ✓ Footing size: 1.5m x 1.5m
- ✓ Depth: 1.2m is adequate
📚 Bearing Capacity Factors (Terzaghi)
| φ (deg) | Nc | Nq | Nγ |
|---|---|---|---|
| 0 | 5.7 | 1.0 | 0.0 |
| 5 | 7.3 | 1.6 | 0.5 |
| 10 | 9.6 | 2.7 | 1.2 |
| 15 | 12.9 | 4.4 | 2.5 |
| 20 | 17.7 | 7.4 | 5.0 |
| 25 | 25.1 | 12.7 | 9.7 |
| 30 | 37.2 | 22.5 | 19.7 |
| 35 | 57.8 | 41.4 | 42.4 |
| 40 | 95.7 | 81.3 | 100.4 |
Source: Terzaghi (1943) - For General Shear Failure
⚠️ Failure Mode Classification (Based on SPT N-value)
| Failure Mode | SPT N-value | Soil Condition | φ Range |
|---|---|---|---|
| 🔴 General Shear | > 30 | Dense Sand / Stiff Clay | > 36° |
| 🟠 Local Shear | 5 - 30 | Loose Sand / Soft Clay | 29° - 36° |
| 🔵 Punching Shear | < 5 | Very Loose Sand | < 29° |
💡 Key Point from Your Notes:
Water table rise in cohesionless soils reduces bearing capacity by up to 50%
Raft foundation used when soil has low bearing capacity (area > 50% of building plan)
For clay (φ=0): Nc = 5.7, Nq = 1, Nγ = 0 (Skempton's method)
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