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Saturday, June 14, 2014

Angle of Repose - Zone of Influence

To watch the video on this go to "Angle of Repose - Zone of Influence"





The Angle of Repose


The angle of repose or the angle of rest is the angle that a material will naturally support itself at. Think of a pile of sand, when it is delivered out of the truck it sits up in quite a nice heap this is the angle of repose.






Over time the influence of the weather and people will cause the heap to spread and lower however generally speaking the weather will not affect the material when it is in the ground. 



The angle depends on the shape and size of the individual grains and how they move over each other.
Material
Angle Of Repose
Wet Sand
45o
Granite
35o - 40o
Dry sand
34o
Crushed Asphalt
30o - 45o
Loose Dry Gravel
30o - 45o
Dry Lump Clay
25o - 40o
Natural Gravel with Sand
25o - 30o
Water filled sand
15o - 30o
Wet Excavated Clay
15o



Zone of Influence


Therefore anything inside the Angle of Repose will support itself and not want to collapse into a  excavation. 












However any thing that is outside the Angle of Repose is in the Zone of Influence. Anything in this zone has the potential to collapse into a excavation if it is affected by weather, water, people or machines or anything else that could cause it to move.

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