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CEG 4012
Homework 7
Due Mon. Nov 7
th
2011
Name:_________________________________
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1.
A small hydroelectric earthen dam in Martin County was constructed several years ago without
filter drains and has begun to show seepage on its face.
The thickness of the base roughly equals
the dam height (i.e., D=2).
The face has a 1:1 slope and it is 40 ft high.
The dam was constructed
with soil from a nearby borrow pit and the soil properties of both the dam and the base are very
similar:
γ
m
= 115 pcf,
γ
sat
= 125 pcf,
φ
u
= 15°, c = 1000 psf,
φ
'
= 35°, c' = 625 psf
If you conservatively assume that r
u
= 0.5 (saturation), what FS do you calculate (
long term
stability
) using the Cousin’s Charts?
What is the location of the center of the critical failure
surface?
2.
Using the Cousin’s charts, determine the FS for an embankment slope with the following
conditions: H = 55 ft, 1:1 slope,
γ
= 110 pcf, c = 600 psf,
φ
= 20° when r
u
= 0, 0.3.
What is the
critical FS for each case of pore pressure?
What type of failure would be expected based on this
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This note was uploaded on 12/14/2011 for the course CEG 4012 taught by Professor Staff during the Fall '08 term at University of Florida.
 Fall '08
 Staff

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