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Bearing Capacity
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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.
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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
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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
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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
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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
Modulus of Vertical Subgrade Reaction
Soil Unit Weights
Young's Modulus or modulus of elasticity
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