at rest lateral earth pressure with sloped backfill (correction to closed thread)

[Mangere275]

thread256-178686

The thread number referenced above has been closed, but contains a typo in one of the formulas.

Here is the original post from Panars:

"2Panars (Geotechnical)21 Feb 07 10:49
In the US Army Corps Manual on Retaining and Flood Walls
EM 1110-2-2502

http://www.usace.army.mil/publications/eng-manuals/em1110-2-2502/toc.htm

you can find two methods to calculate the at-rest earth pressure for sloping backfill. The first is
Ko=(1-sin phi)(1-sin beta) where beta is the backfill slope angle."

The corrected formula from EM 1110-2-2502 is:
Ko=(1-sin phi)(1+sin beta)