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Reinforced Soil Slope Design

Reinforced Soil Slope Design

Reinforced Soil Slope Design

(OP)
I am trying to desin a reinforced soil slope and am looking to verify my design using a slope stability program.  I have tried using RSS (from the FHWA site), but it seems to be overly conservative.  I designed the reinforcement in accordance with the Design Guide presented on Mirafi's website.  

The basics of the problem are:
1H:1V slope, 15' tall
Geotextile wrapped outer surface with rip rap face
reinforced soil - c = 0 phi = 30  unit weight = 125 pcf
Foundation Soil - c = 0 phi = 34  unit weight = 120 pcf
Retained backfill - c =0 phi = 30 unit weight = 125 pcf
surcharge = 250 psf
GW at 11' from crest of slope
Backslope = 0 degrees


Preliminary design in accordance with Mirafi's step by step design guide and using a FS=1.5 indicates a geogrid length of 17' and spacing of 2.5 to 4.0 feet.  I modeled this in RSS and got a FS = 1.1.

Does anyone have experience with RSS?  I know that the program has been upgraded significantly, but the only software I have access to is RSS and XSTABL.  Is RSS ultra conservative?

Thanks

RE: Reinforced Soil Slope Design

bucknell06,

Check out FHWA NHI-00-043 and run your own calcuations based on the FHWA design guidance. There is also a relatively recent NCHRP publication available for MSE walls with flexible facing - I haven't read it but might be applicable to your application.

Jeff

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