t***u
发帖数: 35 | 1 A typical seepage factor of safety check is FS = i(critical)/i(exit)
i(critical) equals effective unit weight divided by water unit weight.
The question is the exit gradient. If the facor of safety is defined
as above, what kind of exit gradient shoulld be used? Considering gradient
is a vector, the total value regarless of direction, or the vertical
component of the gradient?
I tend to use the vertical component, but our senior engineer says
the total gradient value should be used. Any comments | f**h
发帖数: 54 | 2 effective stress<0, quick happens. So it is all about vertical. I agree with
your judgment.
【在 t***u 的大作中提到】
: A typical seepage factor of safety check is FS = i(critical)/i(exit)
: i(critical) equals effective unit weight divided by water unit weight.
: The question is the exit gradient. If the facor of safety is defined
: as above, what kind of exit gradient shoulld be used? Considering gradient
: is a vector, the total value regarless of direction, or the vertical
: component of the gradient?
: I tend to use the vertical component, but our senior engineer says
: the total gradient value should be used. Any comments
| H**E
发帖数: 620 | 3 the equation you used was for vertical flow only.
so strictly say, that equation can only apply for vertical(upward) exit
gradient(magnitude).
if you want to consider total exit gradient, you need to decompose the total
exit gradient into horizontal and vertical components.
for horizontal component, the critical exit gradient can no longer
calculated by the equation you mentioned. |
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