buckling of uncased minipiles
buckling of uncased minipiles
(OP)
I have been approached with an interesting question. A geotechnical engineer has asked me to determine the buckling load of an uncased minipile that is penetrating a zone of poor soil, where the ability of the soil to laterally brace the minipile is questionable. To limit the transfer of downward drag forces to the pile, they want to use a greased PVC sleeve. Hence, there will be no steel sleeve that I can analyze. Because the construction of a minipile is different from a reinforced column, I don't think the ACI methods for column slenderness are completely applicable.
The question: Does anyone know of an accepted procedure for determining the compressive strength of an unbraced, uncased minipile? I have a book by the FHWA, but they only have a method when a steel casing is present.
The question: Does anyone know of an accepted procedure for determining the compressive strength of an unbraced, uncased minipile? I have a book by the FHWA, but they only have a method when a steel casing is present.





RE: buckling of uncased minipiles
RE: buckling of uncased minipiles
RE: buckling of uncased minipiles
RE: buckling of uncased minipiles
If you think you need the casing, I would use it and either addd piles or add capacity to the piles. See Dr. Fellenius' works on downdrag(www.unisoftltd.com)
RE: buckling of uncased minipiles
http://www.schnabel-eng.com/Vol3-no1B.pdf
RE: buckling of uncased minipiles
RE: buckling of uncased minipiles
Regards,

Qshake
Eng-Tips Forums:Real Solutions for Real Problems Really Quick.
RE: buckling of uncased minipiles
ADSC: The International Assn of Foundation Drilling
adsc@adsc-iafd.com" target="_blank">www.adsc-
They have a booklet available for purchase: Buckling of Micropiles: A review of Historic and Recent Experience - costs about $8 for non-members.
RE: buckling of uncased minipiles
RE: buckling of uncased minipiles