Choosing Foundation Type
Choosing Foundation Type
(OP)
hi all,
kindly need your advise about this,
i involved in superblock project (apartment and hotel 26 storey), soil profiles accross site describe as below (average soil boring consistent) :
0-1.5 m : clay (N-SPT 60 = 5)
1.5 - 40 m : sand (N-SPT > 60)
our geotechnical team have been choosing to use driven square piles. with different pile penetration for each areas and now this project already on going.
but we have problem with pile penetration, several piles can't penetrate below Cut of Level.
kindly need your advise about this,
i involved in superblock project (apartment and hotel 26 storey), soil profiles accross site describe as below (average soil boring consistent) :
0-1.5 m : clay (N-SPT 60 = 5)
1.5 - 40 m : sand (N-SPT > 60)
our geotechnical team have been choosing to use driven square piles. with different pile penetration for each areas and now this project already on going.
but we have problem with pile penetration, several piles can't penetrate below Cut of Level.
M.A.





RE: Choosing Foundation Type
I would suppose you are using concrete piles . . .if the soil is so dense and the clay only 1.5 m thick - why are you using piles? A mat foundation might have been a better way. My personal choice in piling in sands is to use expanded base piles (Franki-piles)
RE: Choosing Foundation Type
Next time use another geotech.
RE: Choosing Foundation Type
RE: Choosing Foundation Type
RE: Choosing Foundation Type
My point is, whether it is a franki piles or mat foundation, with that kind of soil type, I'm sure that none of us would ever consider of using driven piles, would we ?
RE: Choosing Foundation Type
I would like to have a look at the cores if they've been extracted. Also, I'd like to have a look at the Whole SPT dataset, intervals at which they've been carried out and so on. Any geophysical tests? Pressuremeter tests?
It sounds more like a soft rock (or maybe even a hard rock, >60 may mean everything, unaltered granites have a SPt>60.
The spt sampling interval is necessary to rule out cavities or soft layers.
And as the other posters have told, what's the sense in using piles if a thick mat would do the job? And why driven piles? Why not drilled shafts? But I've read the project is ongoing, cutting the piles seems to be the only feasible solution now.