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PILE CAPACITY
4- In-Situ Soil Test Methods
The pile capacity can be determined from
the field tests as follows:
1- Standard Penetration Test (SPT).
2- Cone Penetration Test (CPT).
Pile Capacity from SPT
Qall = 90 N (p R2) + N' (2p RL), (kN)
Qall = Pile working load, F.S. = 2.5 for end bearing
and 2.0 for side friction.
N = Average SPT, 2R below tip and 6R above tip,
N ≤ 50 (Preferably ≤ 30).
N' = Average SPT in sand layers, along the pile shaft.
R = Pile radius, (m).
L = Pile length within the sand layers, (m).
For bored piles, Qall = 50 up to 100% of that values according
to the pile type and construction method.
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