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Railway Ballast

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TenthEdition

Structural
Joined
May 2, 2016
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2
Location
US
Has anyone used a 1:1 slope on railway ballast and sub-ballast? AREMA states "A 2:1 is commonly used" in section 2.1.1.5.2.3 Ballast Side Slope Run (BSS).
 
45 degrees exceeds the angle of repose for natural gravel or sand.
EDIT: might be okay for crushed rock.

BA
 
Agree the angle is to much for shear. What about 1:1.5?
 
FYI.

b_ubv6ku.png
 
I suggest to follow the 2:1, or 1-1/2:1 recommendation, and built a barrier wall if land availability is the issue.
 
Stick with 2:1 for track support. Ballast will typically stand at 1:1, but will ravel with time and will cause problems.

If this is for a slope of any significant height, then you need a real stability analysis since the foundation soils and the overall embankment soils will have a big impact on what will and what will not work.

Mike Lambert
 
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