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Re: Retaining wall design pressures

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> Saturated condition and submerged condition are two different
> scenarios.  In saturated case, there is just enough moisture in soil
> to fill all the voids.  Obviously, the unit weight of saturated soil
> would be greater than dry unit weight.  However, the moisture is not
> large enough to develop hydrostatic prssures. In this situation,
> pressure on wall is equal to (Coeff. of lateral earthpressure X
> saturated unit weight of soil X depth under consideration).
> 
> In submerged situation, there is sufficient free water to develop
> hydrostatic pressure.  Therefore, the pressure on the wall will be
> due to two components:  Pressure due to submerged soil (use
> submerged unit weight and coeff. of lateral earthpressure) and
> hydrostatic pressure.
> 
> Rajendran

What happens when you add one drop of water to the saturated 
soil? Does the pressure on the wall suddenly change or are the two 
conditions essentially the same?

Robert