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Excavation of filter bed media

Excavation of filter bed media

Excavation of filter bed media

(OP)
I have been asked by a colleague on site to advise on the angle of repose of 40mm stone media in a filter bed.

They have to excavate a maximum of 1.8m to the base of the bed by hand.  

My initial thoughts are 30deg as a maximum but with the material being stone I feel it will probably be a case of dig it and see!!

Any thoughts on a more rigorous answer to the problem appreciated.

RE: Excavation of filter bed media

Thirty degrees sounds like a safe bet, not a maximum, unless the stones are roundish.  Why don't you dig a test hole and see what the angle of repose is?  It defintiely doesn't sound like you need a soils report.  

RE: Excavation of filter bed media

30 degrees would be about right. Why by hand? Can't get a vac. truck or trailer near enough?

RE: Excavation of filter bed media

(OP)
Thanks guys.  Didn't think of the vac - probably the way to go.  
We're going to dig and see what happens but use 30degs for initial volume calcs!

Cheers

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