Modulus of Soil Reaction
Modulus of Soil Reaction
(OP)
Does anyone know or recommend what modulus of pipe embedment should be used in the spangler equation for buired pipe deflection when the embedment and backfill material will be unshrinkable fill.





RE: Modulus of Soil Reaction
Check that here, where you can find just about any typical values you will ever need and many you never will.
http:/
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Modulus of Soil Reaction
Calculate E' by American Concrete Pipe Asso.
http://
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Modulus of Soil Reaction
RE: Modulus of Soil Reaction
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Modulus of Soil Reaction
http:/
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Modulus of Soil Reaction
Flowable fills in and of themselves may also be subject to significant local (mix etc.) variations. All of this should probably be considered depending on the specific application conditions.
All this being said, while specific sidefill etc. pipe support research or references re flowable fill may be some hard to come by I believe most promoters of even the lower strength "excavatable" flowable fills claim that these materials have anywhere from "equivalent" to many times the "allowable bearing strength" of previously used compacted soils in other engineering applications. If this is the case, one would of course at least intuitively feel that properly mixed and installed flowable fill installations would in general result in very good pipe support, at least to metal pipes.
While E-prime is not a pure backfill material property as I've explained above, I have noticed that the latest version (now in 4th ed. 2004) of AWWA Manual M11, Steel Pipe - A Guide for Design and Installation does discuss use of "constrained soil modulus", a "constitutive material property" for soils, that (values) might also be available or determinable for at least some flowable fills and native soils etc.
RE: Modulus of Soil Reaction
After some phone calls, internet searches and speaking with a helpful geotechnical engineer I found references to research papers and industry publications that established E' values for unshrinkable fill.
In summary, it's a valid assumption to assume that the ufill will have equivalent E' values to about 1000-1500 psi after a short time of setting up.
RE: Modulus of Soil Reaction
thanks
RE: Modulus of Soil Reaction
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com