Slope Angle of Repose
nounPronunciation: /sloʊp ˈæŋɡəl əv riˈpoʊz/
The steepest angle at which unconsolidated material such as spoil, tailings, or fill remains stable without sliding under gravity. This angle varies based on material grain size, moisture content, and friction properties, typically ranging from 30 to 45 degrees.
Plain English
The maximum slope steepness of loose material like mine waste that can stand safely without sliding down.
Etymology & History
Usage
"Reclamation engineers designed spoil piles with slopes matching the angle of repose to prevent erosion and mass failures."
Style guide notes: Always provide specific degree measure or material type when referencing angle of repose.
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Related Terms
Frequently Asked Questions
How is angle of repose determined for mine reclamation?
Laboratory testing of spoil material samples measures internal friction angles and field observations validate stable slope configurations.
What happens if slopes exceed the angle of repose?
Material slides downslope creating erosion, unstable landforms, increased sediment transport, and potential safety hazards to personnel or structures.
Why Test Candidates on This?
Fundamental parameter for safe design of surface mine waste piles and reclaimed landforms.
Required skill level: Junior