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Coefficients of Pile Bearing Capacity

Recommended ranges of values of coefficients of pile base resistance Np and coefficient β are listed in the following table. The coefficient β is usually found in the given range, it seldom exceeds the value 1,0.

Range of coefficients Np and β (Fellenius, 1991)

Type of soil

φef

Np

β

Clay

25 - 30

3 - 30

0.23 - 0.40

Silt

28 - 34

20 - 40

0.27 - 0.50

Sand

32 - 40

30 - 150

0.30 - 0.60

Gravel

35 - 45

60 - 300

0.35 - 0.80

Literature:

Fellenius, B.H.: Foundation Engineering Handbook, Editor H.S. Fang, Van Nostrand Reinhold Publisher, New York, 1991, 511 - 536.

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