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# Dynamic Lateral Soil Load for Soil Below the Water Table

## Dynamic Lateral Soil Load for Soil Below the Water Table

(OP)
Hello All,

I have a question regarding the lateral loading condition on a buried structure that is below the water table.

The static condition is quite simple, At-Rest buoyant soil plus hydrostatic. However, when we need to consider seismic things get quite a bit more complicated. I have done quite a bit of reading and there appears to be little research and many differing opinions on how to consider things:

1. If we have with Conditions relatively dense materials say less than 10^-4 m/s permeability:

1A - Consider the M-O for yielding or Wood for non-yielding, use the FULL density of soil including the water. Then do we need to add the hydro static water load as well some say yes some say no?

1B - Consider the M-O or Wood equation using the buoyant density of soil then add the hydrostatic load, no consideration of any hydrodynamic.

2. If we have Conditions relatively "un-dense" materials say greater 10^-4 m/s permeability:

2A - Loose granular soils to boulders or 1 foot rip rap - Consider the M-O or Wood equation with buoyant density then either:

ii) add hydro dynamic based on Westerguard and do not add hydrostatic

i) do not add hydro dynamic based on Westerguard but add hydrostatic

2B - Loose granular soils to uncompacted boulders or 1 foot rip rap - Consider the M-O or Wood equation with FULL density then add hydrostatic or not?

There were some other articles that had a very complicated method for considering the amount of hydrodynamic to consider based on varying degrees of permeability!

Im sure there are many other combinations so I am looking for some Geotech input on what people recommend using.

Thanks

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