Surcharge Load on Retaining Wall
Surcharge Load on Retaining Wall
(OP)
Does anyone have a procedure for determining the effects on a cantilevered retaining wall from a concentrated surcharge load on the fill side, including increased active pressure on wall and impact on footing bearing pressure? I have two methods from different sources and neither agree with the other.






RE: Surcharge Load on Retaining Wall
RE: Surcharge Load on Retaining Wall
http://www.vulcanhammer.net/download/dm7_02.pdf
RE: Surcharge Load on Retaining Wall
RE: Surcharge Load on Retaining Wall
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Surcharge Load on Retaining Wall
RE: Surcharge Load on Retaining Wall
The development of active pressure will depend on the movement of the wall. If I recall correctly, DM7.2 lists wall rotations required to develop active pressure for both granular and cohesive soils. If the anticipated wall movement under active earth pressure is less than that required to develop active presures, then you should probably assume that Ko conditions apply and that the active condition will not fully develop.
The relationship between change in earth pressure coefficient (from at-rest to active) and wall movement may not necessarily be linear.
Hope this helps,
Jeff
Jeffrey T. Donville, PE
TTL Associates, Inc.
www.ttlassoc.com
RE: Surcharge Load on Retaining Wall
RE: Surcharge Load on Retaining Wall
Previous editions of the text (such as the 2nd Edition, which is the one I have on my shelf) leave out important subtleties in the presentation of some of the expressions, I find, such as the Boussinesq vertical stress below the corner of a rectangular foundation and Jarquio's derivations for lateral pressure due to an infinite strip surcharge.
Use with care.
Jeff
Jeffrey T. Donville, PE
TTL Associates, Inc.
www.ttlassoc.com
RE: Surcharge Load on Retaining Wall
RE: Surcharge Load on Retaining Wall
There are several different approaches - some more, some less conservative.
I prefer to use elasticity-based methods, at least as a first attempt, as 1) the results tend to be more conservative than other methods and 2) many public agency design manuals specify or recommend the use of such methods.
Jeff
Jeffrey T. Donville, PE
TTL Associates, Inc.
www.ttlassoc.com
RE: Surcharge Load on Retaining Wall