Geoscience Reference
In-Depth Information
The table also shows the soil - reinforcement interface friction angle, based on the
friction angle (
φ
) of the soil.
The geogrids and geotextiles would have to consider the effects of creep and
resistance to chemical attack with suitable reduction factors applied to the
strength.
The metallic reinforcement thickness needs to take into account the effects of
corrosion.
Figure 20.3 Coefficients for reinforced soils walls.
20.9 Location of potential failure surfaces for reinforced
soil walls
The location of the potential failure surface depends on the type of movement.
Inextensible reinforcement has less movement with an active zone close to the wall
face.
Extensible reinforcement has greater capacity for movement with the typical
Rankine active zone.
Table 20.9 Location of potential failure surfaces for RSW (TRB, 1995).
Type of
Failure surface from base
Distance from wall to
Example
reinforcement
H
Height of wall
failure surface at top
=
Inextensible
Tan 1 {0.3 H/(H/2)}
Ta n 1 0.6
0.3 H
Wire mesh, metal strip
=
extending to 0.5H from base
Soil nails
Extensible
(45 + φ
/2) extending to surface
H tan (45 φ
/2)
Geotextile, Geogrids
 
 
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