Uplift Capacity??
Uplift Capacity??
(OP)
Hi all,
Any rule of thumb when estimating uplift capacity of piles?
We have piles (300 dia, between 2m and 3m deep) embedded in a mixture of cohesive and granular soils. Su in cohesive range between 70kPa to 150kPa. DCP readings of between 2 & 3 in granular (50mm increments).
We are doing pullout test at construction stage to confirm but want an estimate for design purposes.
Cheers
Any rule of thumb when estimating uplift capacity of piles?
We have piles (300 dia, between 2m and 3m deep) embedded in a mixture of cohesive and granular soils. Su in cohesive range between 70kPa to 150kPa. DCP readings of between 2 & 3 in granular (50mm increments).
We are doing pullout test at construction stage to confirm but want an estimate for design purposes.
Cheers





RE: Uplift Capacity??
RE: Uplift Capacity??
RE: Uplift Capacity??
What I do consider important is the length of the pile, from the description I can't be sure.
If the piles are 2 to 3 meters long, I would expect uplift resistance to be a very low percentage of the allowable bearing (say, << 25%).
If the piles are "long" (perhaps 8 to 10 meters), with the last 2 to 3 meters embedded in good soil, then uplift resistance may be much higher (say, > 30% of total allowable bearing).
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RE: Uplift Capacity??
A value less than 25% does sound reasonable in this case. Would this be the allowable uplift pressure or un-factored?
I came across this equation (see attached), have you guys used this before?
RE: Uplift Capacity??
RE: Uplift Capacity??
RE: Uplift Capacity??
RE: Uplift Capacity??