TM 5-818-8/AFJMAN 32-1030
a. FORCES INVOLVED IN SPLITTING AND SLIDING ANALYSES
NOTE:
FABRIC MODULES CONTROLS
LATERAL SPREADING
b. GEOTEXTILE STRAIN CHARACTERISTICS RELATING TO
EMBANKMENT SPREADING ANALYSIS
Figure 4-3. Assumed Stresses and Strains Related to Lateral Earth Pressures.
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
4-5
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