End Bearing Values for cast-in-place concrete piles in dense gravel??
End Bearing Values for cast-in-place concrete piles in dense gravel??
(OP)
I am working on a project where we have heavy vertical loads (1200-2500 KN)to be supported by 760 mm diameter drilled cast-in-place concrete piles. The water table is below the maximum depth of the pile, which is ~15 m. My research on maximum end bearing values for piles in dense gravel yielded an ultimate value of 12 MPa (by Poulos).
Doe anyone have any other references for maximum values in gravel? Or any literature with load tests completed for a similar scenario?
Using a Factor of Safety of 2.5 results in an allowable end bearing value of 4,800 kPa. Does this seem high?
Your comments would be greatly appreciated.
Doe anyone have any other references for maximum values in gravel? Or any literature with load tests completed for a similar scenario?
Using a Factor of Safety of 2.5 results in an allowable end bearing value of 4,800 kPa. Does this seem high?
Your comments would be greatly appreciated.





RE: End Bearing Values for cast-in-place concrete piles in dense gravel??
Sorry, I'm not that good in metric, but I tried. . . .
f-d
¡papá gordo ain’t no madre flaca!
RE: End Bearing Values for cast-in-place concrete piles in dense gravel??
RE: End Bearing Values for cast-in-place concrete piles in dense gravel??
If this is a form of caisson, installed inside a casing, the same question. If the gravel is disturbed and not left in its original condition, you are asking for settlement from that loosening. Any water there may also affect things by washing out the cement from the mix.
Take a look at the current ENR web site and the article about Clyde Baker. He has written articles about how you can have settlement of caissons due to these bottom of excavation situations.
Try this link: http://enr.construction.com/
There is a nice article about him.
Then look up some of his papers at ASCE.
I'd much prefer to load test some typical piles to be sure I had the bearing that was predicted.
RE: End Bearing Values for cast-in-place concrete piles in dense gravel??
RE: End Bearing Values for cast-in-place concrete piles in dense gravel??