On Wed, 20 Nov 2019 at 13:40, Martin Koppenhoefer <dieterdre...@gmail.com> wrote:
> Am Mi., 20. Nov. 2019 um 14:12 Uhr schrieb Paul Allen <pla16...@gmail.com > >: > >> Note also that, in civil engineering, retaining walls made of earth are a >> thing. See >> this video explaining mechanically stabilized earth walls: >> https://www.youtube.com/watch?v=0olpSN6_TCc >> >> > these are retaining walls, the whole filling is reinforced. > Yes, they're retaining walls. But, since they're made of earth (often visibly so), may be naively mapped as embankments by some. A civil engineer may be able to infer, from the angle of repose, that they are reinforced but that is not obvious to a casual observer since the reinforcement is not visible. Also, even though they're retaining walls, it may be that what they're retaining is more earth, making them look even more like embankments. I wouldn't want anyone to think, because of this discussion, that "made of earth" = "embankment." However, many embankments (especially modern ones) may have steep angles of repose because reinforcing them means less material is needed and makes them cheaper. The line is blurred. In the end, it comes down to why the thing was built. -- Paul
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