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# seismic wall pressures

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## seismic wall pressures

(OP)
I found a 2014 thread addressing this issue but it is now closed.

OCGEO posted:

For a recent design of a non-yielding (at-rest) wall.....

For At-Rest Earth Pressure (level).... Ko = 1 - sin(phi) ---- Jaky, 1944
For At-Rest Seismic Earth Pressure.... Koe = 2*kh (where kh = 1/2 PGA-M) ---- Wood (1973); Whitman (1991); Al Atik and Sitar (2010)
For At-Rest Earth Pressure (sloping).... Ko = (1 - sin(phi))/(1 + sin(beta)) ---- Kezdi 1972
For At-Rest Static and Seismic with sloping backfill... K and Koe = ~2*M-O (Mononobe-Okabe for active earth pressure) ---- Wood (1973); Whitman (1991); Al Atik and Sitar (2010)

I would like to know whether triangular or trapezoidal or a combination two should be used for these values.

Thanks,

### RE: seismic wall pressures

The at rest pressures are either triangular or trapezoidal depending on any additional traffic or surcharge loading.

The seismic pressures are usually rectangular.

Mike McCann, PE, SE (WA)

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