Design of Piles

Following guidelines may be considered in design of piles

1. Direct vertical load coming on the pile should be considered.
2. In case of driven piles, the impact stresses induced due to pile driven is taken into account.
3. Bending stresses induced due to bending in piles and due to eccentricity to be accounted.
4. (iv) Lateral forces due to wind, waves, water, current, ice sheets, impact of ships are to be accounted
5. Forces due to uplift may also to be considered.
6. If the area is earthquake – prone area necessary modifications have to be made.
7. Load carrying capacity of pile is computed based on the type of pile. Pile load tests can be done for all type of piles. For driven piles, pile driving formulas can be used. One such formula is ENR formula which is derived on the basis of work-energy theory. The ENR formula has been modified by Hiley as the ultimate pile load, , is given as

Where  = Hammer efficiency

W = Weight of hammer

h = Height of fall

S = Final set

 = Efficiency of the blow.

C = Sum of the temporary elastic compression of the pile.