Tiered cantilever-type retaining walls
Tiered cantilever-type retaining walls
(OP)
Looking for method for determining horiz.load from upper wall to lower wall. Methods for MSE walls don't work. Thanks in advance.
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
Tiered cantilever-type retaining walls
|
RE: Tiered cantilever-type retaining walls
RE: Tiered cantilever-type retaining walls
Or you could try to use the bearing pressure from the top wall as a strip load. However if you are also relying on passive pressure for your top wall then this may throw a wrinkle in the analysis.
EIT
RE: Tiered cantilever-type retaining walls
RE: Tiered cantilever-type retaining walls
EIT
RE: Tiered cantilever-type retaining walls
RE: Tiered cantilever-type retaining walls
RE: Tiered cantilever-type retaining walls
Or even more conservative (I would think) is to do as you previously suggested and draw line form top of the lower to the top of the upper wall.
I agree with drawing the active and passive wedges and if they do not intersect then they should not influence each other. This would also put the upper walls bearing pressure behind the failure plane of the lower wall which most research would indicate that the bearing pressure does not influence the lower wall (but I would use a 1:1 to be more conservative).
If the lines do intersect I'm not sure how to apply the passive pressure to the lower wall but I have been very interested in this. I imagine something like this - The passive pressure is due to the weight of the passive soil wedge in front of the upper wall. Therefore the soil inside of both the active and passive wedges cannot be used for passive resistance. The weight of this soil would then need to be applied to the lower wall as a force. But I'm not sure how to distribute it.
EIT
RE: Tiered cantilever-type retaining walls
The passive resistance provided by the terrace can be calculated using a Culman curve. Details on how to construct a Culman curve can be found in the "USS Sheet Piling Design Manual".
Hope this helps.
RE: Tiered cantilever-type retaining walls
EIT
RE: Tiered cantilever-type retaining walls
RE: Tiered cantilever-type retaining walls
you should also search the forums at one point I posted another PDF of a stepped wall situation and the load conditions a geotrch developed for me.
Worst case just apply the full passive resistance horizontal load as a partial load behind the lower wall & then add the boussinesq surcharge from the vertical bearing pressure.
RE: Tiered cantilever-type retaining walls
I believe this is the other thread you are referring to?
thread255-240427: Multiple stepped sheet pile walls
EIT
RE: Tiered cantilever-type retaining walls
here is a link to a good book that has various solutions, including the passive pressure and the soil stress at a distance away.
http://www.ce.ncsu.edu/usucger/PandD/PandD.htm