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CEEN 641 – ADVANCED SOIL MECHANICS
HOMEWORK ASSIGNMENT #29
1.
Using the finite element analysis program PLAXIS, determine the ultimate passive force
acting on a gravitytype retaining wall.
The concrete wall is 12ft tall, has vertical faces, is
very rigid, and should be modeled as a horizontallytranslating plate element without rotation
and appropriate interface(s).
The retained soil is level and should be modeled using a Mohr
Coulomb soil model with the following idealized properties:
a constant elastic modulus of
1,500,000 psf, a poisson’s ratio of 0.3, a moist unit weight of 140 pcf, a friction angle of 40
degrees, no cohesion, and a dilatancy angle of 40 degrees (an unrealistic value).
The ground
beneath the wall has the same properties as the retained soil, and the water table is very deep.
Perform all of your work based on a 1ft unit width of wall.
Other information that may/will prove helpful:
•
The frictional strength ratio between formed concrete and soil is typically taken to be
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 Fall '10
 TravisGerber

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