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.