Soil Bearing Capacity (Terzaghi)
Geotechnical IS 6403:1981~2 min
Calculate ultimate and safe bearing capacity of soil using Terzaghi's general bearing capacity equation.
Formula
qu = c·Nc + q·Nq + 0.5·γ·B·Nγ
Input Parameters
Results
Bearing Capacity Factor (Nc)
20.72
Ultimate Bearing Capacity
763.1kN/m²
Safe Bearing Capacity (FOS=3)
254.4kN/m²
Step-by-Step Method
- 1Determine soil parameters: c, φ, γ from soil investigation.
- 2Calculate bearing capacity factors Nc, Nq, Nγ.
- 3qu = c·Nc + q·Nq + 0.5·γ·B·Nγ.
- 4Safe bearing capacity = qu / FOS (FOS = 3 typically).
Engineering Notes
- •FOS = 3 for general shear failure.
- •For local shear failure, use c' = 2c/3 and tan φ' = 2/3 tan φ.
Code Reference
IS 6403:1981
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