properties of granular soil
properties of granular soil
(OP)
Has anybody got information about effect of grain size of sand or gravel on internal angle of friction or angle of repose?
revaha
revaha
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properties of granular soil
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RE: properties of granular soil
For instance dry Sand particles of 0.5mm in diameter may have an angle of repose of approx 30 degrees, small gravels (12mm diameter) will have an angle of repose of about 40 degrees with larger gravels (25mm diameter) being around 50 degrees.
Angular gravels will have an increased angle of repose by upto 15 degrees when compared to smooth gravels of similar size.
Moist (NOT Saturated) sand could have an angle of repose almost double that of dry sands.
RE: properties of granular soil
RE: properties of granular soil
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RE: properties of granular soil
Otherwise...interesting. GeoPave, it sounds like these test method results reflect their own shortcomings rather than the actual soil properties. Is there one that will cover most soil types, or are reliable results limited to just a select few for friction angle. I know when our lab tests soils w/ a high nominal aggregate size, we just use a 'bigger' test, like the vibratory table in place of the D1557. Just interested, it sounds like you're experienced.
RE: properties of granular soil
In some ways you are right, the particle size is a limiting factor in triaxial or direct shear tests. But if your goal is to measure the strength of the material with a laboratory test, then you are stuck with one of those methods. Your options become removing the larger particles or using a larger test apparatus. The largest one that I can recall seeing results from was 3 or 4 feet in diameter and was special built for a dam project in central or south america. This problem becomes particularly relevant to the construction of rock fill dams.
With respect to angle of repose and angle of internal friction, I assumed that qwedsa was using the terms interchangeably. While not technically correct, it is common in many areas.
RE: properties of granular soil
Can you please provide some published papers (by yourself or others) on this subject?
Thanks