Jacking Pit Thrust Block Design
Jacking Pit Thrust Block Design
(OP)
I read a very informative thread re: thrust blocks in jacking pits, but it has been closed. I'm designing a thrust block in a slide-rail-shored pit in which the lower panels will be raised, and the thrust block will bear horizontally on the soil, developing passive pressure. The transition has been accounted for, but is irrelevent here. My question is about arching factor. When I design soldier piles, I use an arching factor at the toe of 2.0-3.0, based on CalTrans'.08xphi. For a 12'w. x 6'h R.C. block, would an arching factor of 2.0 be extreme, yielding an effective passive pressure area of 24' x 12'?





RE: Jacking Pit Thrust Block Design
www.PeirceEngineering.com
RE: Jacking Pit Thrust Block Design
www.PeirceEngineering.com
RE: Jacking Pit Thrust Block Design
RE: Jacking Pit Thrust Block Design
RE: Jacking Pit Thrust Block Design
www.PeirceEngineering.com
RE: Jacking Pit Thrust Block Design
Current code CTE SE_C that cares of foundations has charts for cohesive and noncohesive mediums. Look pages SE-C-146 adn 147.
http://www.codigotecnico.org/index.php?id=33
download DB-SE C if you want.
RE: Jacking Pit Thrust Block Design
Have to agree with PEInc on this one. I use an effective width on drilled and driven piles all the time for shoring applications. However, I would not do so for a thrust block.
J
RE: Jacking Pit Thrust Block Design
Thank you for the explanation, however, I am still confused, where are the "2 or more fixed points" in your application?
RE: Jacking Pit Thrust Block Design
RE: Jacking Pit Thrust Block Design
Do you mean you have two (fixed) jacking points/blocks, so you wonder whether the Caltrans pressure reduction provisions (used for sheetpiling design) applies or not?
RE: Jacking Pit Thrust Block Design
He also discusses anchor blocks in clay.
Some caution would be in order when applying these results to a thrust block in a pit, especially in clay.