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Bearing Capacity Factors

Bearing Capacity

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Bearing Capacity

 Bearing capacity is the ability of the underlying soil to support the foundation loads without shear failure. Bearing capacity factors are empirically derived factors used in a bearing capacity equation that usually correlates with the angle of internal friction of the soil.

See the bearing capacity technical guidance for equations and detailed calculations for applying the following bearing capacity factors. This link also explains each BC factor with relation to the bearing capacity component. Each BC factor below is related to the angle of internal friction.

Terzaghi’s Bearing Capacity Factors

 f Nc Nq Ng 0 5.7 1 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 25 25.1 12.7 9.7 30 37.2 22.5 19.7 34 52.6 36.5 35.0 35 57.8 41.4 42.4 40 95.7 81.3 100.4 45 172.3 173.3 297.5

Meyerhof Bearing Capacity Factors

 f Nc Nq Ng 0 5.14 1.0 0.0 5 6.5 1.6 0.07 10 8.3 2.5 0.37 15 11.0 3.9 1.1 20 14.8 6.4 2.9 25 20.7 10.7 6.8 30 30.1 18.4 15.7 32 35.5 23.2 22.0 34 42.4 29.4 31.2 36 50.6 37.7 44.4 38 61.4 48.9 64.1 40 75.3 64.2 93.7 42 93.7 85.4 139.3 44 118.4 115.3 211.4

Vesic Bearing Capacity Factors

 f Nc Nq Ng 0 5.14 1.0 0.0 5 6.5 1.6 0.5 10 8.3 2.5 1.2 15 11.0 3.9 2.6 20 14.8 6.4 5.4 25 20.7 10.7 10.8 30 30.1 18.4 22.4 32 35.5 23.2 30.2 34 42.4 29.4 41.1 36 50.6 37.7 56.3 38 61.4 48.9 78.0 40 75.3 64.2 109.4 42 93.7 85.4 155.6 44 118.4 115.3 224.6

Hansen Bearing Capacity Factors

 f Nc Nq Ng 0 5.14 1.0 0.0 6 6.81 1.23 0.11 10 8.3 2.5 0.39 16 11.63 4.34 1.43 20 14.8 6.4 2.95 26 22.25 11.85 7.94 30 30.1 18.4 15.07 32 35.5 23.2 20.79 34 42.4 29.4 28.77 36 50.6 37.7 40.05 38 61.4 48.9 56.17 40 75.3 64.2 79.54 42 93.7 85.4 113.95 44 118.4 115.3 165.48

Foundation Engineering Handbook

 f Nc Nq Ng 0 5.14 1.0 0.0 5 6.5 1.57 0.45 10 8.35 2.47 1.22 15 10.98 3.94 2.65 20 14.83 6.4 5.39 25 20.72 10.66 10.88 30 30.14 18.4 22.4 32 35.49 23.18 30.22 34 42.16 29.44 41.06 36 50.59 37.75 56.31 38 61.35 48.93 78.03 40 75.31 64.20 109.41 42 93.71 85.38 155.55 44 118.37 115.31 224.64

### Bearing Capacity Factors for Deep Foundations

Meyerhof Values of Nq For Driven and Drilled Piles

 f Driven Drilled 20 8 4 25 12 5 28 20 8 30 25 12 32 35 17 34 45 22 36 60 30 38 80 40 40 120 60 42 160 80 45 230 115

Other soil and soil related properties are listed below:

Angle of Internal Friction
Bearing Capacity Factors
Cohesion
External Friction Angle
Factor of Safety
Lateral Earth Pressure Coefficients
Soil Unit Weights
Young's Modulus or modulus of elasticity

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