Caisson Pile with rock socket
Caisson Pile with rock socket
(OP)
Consider a caison steel pile, concrete filled with a rebar center core running from top of pile to bottom of rock socket.
The steel casing extends a small distance into the socket, after that, only concrete and rebar core.
Design Capacity
My view is that the capacity is limited to the allowable capacity for concrete plus allowable capacity for rebar stress, but not the casing, because right at the point that the casing ends (at the top of the socket), only concrete and rebar is working.
Finally, the socket depth is a function of allowable adhesive stress x perimeter of concrete x rock socket depth.
Socket depth is a separate limiting factor, not related to pile capacity stated above, except that it has to be the same or greater
Others have suggested the pile capacity includes adding the casing capacity to the concrete plus rebar.
Are they right?
The steel casing extends a small distance into the socket, after that, only concrete and rebar core.
Design Capacity
My view is that the capacity is limited to the allowable capacity for concrete plus allowable capacity for rebar stress, but not the casing, because right at the point that the casing ends (at the top of the socket), only concrete and rebar is working.
Finally, the socket depth is a function of allowable adhesive stress x perimeter of concrete x rock socket depth.
Socket depth is a separate limiting factor, not related to pile capacity stated above, except that it has to be the same or greater
Others have suggested the pile capacity includes adding the casing capacity to the concrete plus rebar.
Are they right?






RE: Caisson Pile with rock socket
I haven't had the occasion to need to include the casing as a part of the design capacity. For your application how much capacity, relatively, would it add?
In my area casings are provide by the driller on an "as needed" basis. I'd be sticking my neck out a bit if I assumed there was a continuous casing present. Use of a casing pretty much a given for you?
regards,
Michel
RE: Caisson Pile with rock socket
RE: Caisson Pile with rock socket
Depth of rock socket is not in question.
RE: Caisson Pile with rock socket
regards,
Michel