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Seismic strength reduction in dry cemented sands?

Seismic strength reduction in dry cemented sands?

(OP)
I'm doing slope stability analyses on a small slope.  It's under a building and never gets wet.  No groundwater.  The soil is slightly cemented silty sand, phi=45, c=600.  The FSs are very high, as I knew they would be, but the County wants me to do the analyses, anyway.

The static FS is 6.5.  The seismic FS is 3.3, with c=600.  I was wondering if I should reduce c due to cyclic loading.  Are there any papers on the subject of cyclic loading on weakly cemented, dry sands?  I believe Nick Sitar at Cal wrote on this topic, but can't find the papers.

Just for fun, I ran the seismic analysis with c=50, and got a FS of 1.1.  But I think c should be much closer to the static value of 600.

RE: Seismic strength reduction in dry cemented sands?

try berkeley. i suggest you pay for membership. invaluable number of great papers available. i searched "cyclic cemented". good luck
http://nisee.berkeley.edu/elibrary/search

RE: Seismic strength reduction in dry cemented sands?

Both the phi and c values seem very high for a slightly cemented silty sand.  As a starting point, I would try using 80% of the static strength.  Try looking at the publication "recommended procedures for implementation of DMG special publication 117".  For this type of material, I would use the peak shear strength from a remolded sample (sample remolded to the in situ moisture and density).

RE: Seismic strength reduction in dry cemented sands?

I meant to say peak "drained" or "effective stress" strength.  The sample should be saturated during the test.   

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