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[Fwd: passive pressure for retaining wall]

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Have any one consider soil pressur under retaining wall footing
to calculate the passive pressure resistance for reataining walls
as shown in example of  REINFORCED MASONRY ENGINEERING  HANDBOOK BY
JAMES AMRHEIN FIFTH EDITION UPDATED
page # 278 or forth edition page # 255
where he take the avrage soil pressre devided by soil weight
and consider that hieght for passive resistance pressure.

page 278

passive lateral soil resistance =200psf/ft
avarege  soil pressure= 1/2(231+97)=1214 psf

equivalent soil depth = 1214/110 (soil weight)=11 ft
lateral passive resistance at end   Pp=200x11=2200 psf
so he started the passive by 2200 psf not 200 psf as soil report
that way you will find out you need a very short key instead of long one

this survey if any one has opinion let me know it is very important
you find out you can save  a lot in construction for keys


Dave Anderson  P.E.


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