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Lateral Pressure of Mulch

Lateral Pressure of Mulch

Lateral Pressure of Mulch

(OP)
Anyone have any estimates to the weight and/or Ka and/or c values for mulch or even a Equivalent Fluid Pressure.

I found a couple of papers but one lists the phi of mulch at 45 degrees while the other lists it at 14 degrees with c = 12 psf.

This paper used direct shear tests
http://files.engineering.com/getfile.aspx?folder=e...

This paper used tilt table
http://files.engineering.com/getfile.aspx?folder=e...

Any other thoughts on why these are so different?

Thanks!

EIT
www.HowToEngineer.com

RE: Lateral Pressure of Mulch

True mulch should act as a granular material, so I would expect phi of 45 deg to be close. If they are confusing compost with mulch, then a lower phi would be appropriate.

RE: Lateral Pressure of Mulch

Not answering your question, but I wouldn't design bins for mulch storage, as it is almost inevitable that in the future they will be loaded with heavier soil materials.

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