Allowable loads on piles
Posted in Piles Engineering |
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The most commoly used formula to determine the allowable static load on a pile is the Engineering News formula.This is given below:
Pa=(2WH)/(p+1)
For piles driven by a steam hammer, the allowable load is given as:
Pa=(2WH)/(p+0.1)
where
Pa=allowable pile load, tons (kg)
W= weight of hammer, tons (kg)
H= height of drop, ft (m)
p= penetration of pile per blow, in (mm)
The two equations include a factor of safety of 6. For a group of piles penetrating a soil stratum of good bearing characteristics and transferring their loads to the soil by point bearing on the ends of the piles, the total allowable load would be the sum of the individual allowable loads for each pile. For piles transferring their loads to the soil by skin friction on the sides of the piles, the total allowable load would be less than the sum on the individual allowable loads for each pile, because of the interaction of the shearing stresses and strains caused in the soil by each pile.
Dear Sir,
Informations are so useful.. i have some doubts. In Pile foundation Under reamed bulb are possible in driven piles. Which pile is suitable for sandy soil a. Bored cast-in-situ piles or b. Driven cast-in-situ piles? Kindly reply me as soon as possible
Thanks & Regards,
E. Selva
Chennai
the factor of safety is 6 only when the measurements are in ft and inches
suitable alteration in metric system
I NEED PILE LOAD TEST CONCERNED IS CODE . IF SOME KNOWS PLZ SEND ME
Dear Sir,
Kindly give me the details of Dynamic load test and also how to approve the pile based on the above test.
Regards,
James
Pls refer to ASTM D 4945-89 & compare dynamic pile capacity with IS 2911 part IV
Dear Sir,
can anybody pls. suggest me what steps need to be taken to avoid ingress of sand/silt into the pile bore.which brand bentonite slurry & what pH need to be maintained
M.S liners has been driven but don’t go below 6-7m below bed lvl.