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Compare Rankine's and Coulomb's lateral earth pressure theories.
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Rankine Earth Pressure theory Coulomb's Earth Pressure Theory
In this,rankine's considered
real,frictionless face of retaining wall
which is in contact with backfill.
In this,Coulomb considered
a retaining wall with friction.
Here retaining wall is only vertical It may be vertical,or inclined or both.
In this theory,elemental failure
is considered.
Here wedge failure is considered.
We can find both active and passive
earth pressure.
It is not suitable for passive stage.
This is related to plastic
equilibrium
This is related to elasticĀ 
equilibrium.
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