given embankment geometry the FS is controlled

where

by the soil-geotextile friction. A minimum FS of

PR = resultant of resisting forces

X = dimensionless slope parameter (i.e., for

1.5 is recommended against sliding failure. By

combining the previous equations with a factor of

3H on 1V slope, X = 3 or an average

slope may be used for different embank-

2, and solving for

, the soil geotextile friction

angle gives the following equation:

ment configurations)

= soil-geotextile friction angle (degrees)

(eq 4-5)

A factor of safety against embankment sliding

failure may be determined by taking the ratio of

If it is determined that the required soil-geotextile

the resisting forces to the actuating forces. For a

friction angle exceeds what might be achieved

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