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

 

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