Geosynthetics August/September 2022 - 28

Building a reinforced soil wall with geogrids at hillside
have the flexibility to vary the angle
of inclination of the facade, generally
using an angle of 70°. In turn, they work
with any type of filler material since
the geogrids used as reinforcement are
chemically inert.
The system starts from the placement
of a draining filter at the base of the wall.
To do this, a drainage system is used,
with a 6-inch (15 cm) diameter perforated
PVC pipe wrapped in a nonwoven
geotextile that is connected to a runoff
collection system with Geodren on the
retained soil. Depending on the saturation
conditions of the foundation floor, a
layer of crushed gravel at least 20 inches
(50 cm) thick is placed in the first basket
of the wall.
The reinforcement used is with uniaxial
geogrids (HDPE), which resist
large stress loads in one direction. In
turn, its opening allows a good interaction
with the filling material, allowing
the interlocking between particles to be
achieved, achieving a high performance
of the structural filling. In Honduras, this
system is commonly used for landslide
stabilization, widening roads or stirrups
in bridges.
Reinforced fill
The filler material used (Figure 2) was
a tuff, taken from a borrow pit located
7 miles (12 km) from the construction
zone. Its geotechnical parameters are
shown in Table 1. Various material
banks with better geotechnical characteristics
were evaluated but had the
disadvantage of being too far from the
construction zone or presenting poor
borrow material.
FIGURE 2 The filler material used from a nearby borrow pit
Borrow pit 12+700 (used)
% Passing
4.75 mm
#40
#200
Maximum particle size (mm)
Plasticity Index (PI)
Friction angle (°)
Specific weight (KN/m3)
100
68.9
35.6
102
NP
34
14
TABLE 1 Geotechnical parameters of the filling material used
Value
100
21.6
15.6
102
9
35.3
21
Borrow pit Sierra (optional)
MSE wall design
For the design of the wall, the following
types of analyses were performed:
* Analysis of external and internal
stabi lity: Using the TensarSoi l
program, which applies the DEMO
82 methodology (FHWA 1997) and
assesses the behavior of the wall
against sliding, loading capacity
and turning (external stability) and
internal sliding of geogrids (internal
stability), which takes into account
factors such as tension, pullout, and
pullout and breaking connections.
* Global stability analysis: For this
purpose, the TensarSlope limit
equilibrium analysis program is used,
28
Geosynthetics | August September 2022

Geosynthetics August/September 2022

Table of Contents for the Digital Edition of Geosynthetics August/September 2022

Geosynthetics August/September 2022 - Cover1
Geosynthetics August/September 2022 - Cover2
Geosynthetics August/September 2022 - 1
Geosynthetics August/September 2022 - 2
Geosynthetics August/September 2022 - 3
Geosynthetics August/September 2022 - 4
Geosynthetics August/September 2022 - 5
Geosynthetics August/September 2022 - 6
Geosynthetics August/September 2022 - 7
Geosynthetics August/September 2022 - 8
Geosynthetics August/September 2022 - 9
Geosynthetics August/September 2022 - 10
Geosynthetics August/September 2022 - 11
Geosynthetics August/September 2022 - 12
Geosynthetics August/September 2022 - 13
Geosynthetics August/September 2022 - 14
Geosynthetics August/September 2022 - 15
Geosynthetics August/September 2022 - 16
Geosynthetics August/September 2022 - 17
Geosynthetics August/September 2022 - 18
Geosynthetics August/September 2022 - 19
Geosynthetics August/September 2022 - 20
Geosynthetics August/September 2022 - 21
Geosynthetics August/September 2022 - 22
Geosynthetics August/September 2022 - 23
Geosynthetics August/September 2022 - 24
Geosynthetics August/September 2022 - 25
Geosynthetics August/September 2022 - 26
Geosynthetics August/September 2022 - 27
Geosynthetics August/September 2022 - 28
Geosynthetics August/September 2022 - 29
Geosynthetics August/September 2022 - 30
Geosynthetics August/September 2022 - 31
Geosynthetics August/September 2022 - 32
Geosynthetics August/September 2022 - 33
Geosynthetics August/September 2022 - 34
Geosynthetics August/September 2022 - 35
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Geosynthetics August/September 2022 - 37
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Geosynthetics August/September 2022 - 41
Geosynthetics August/September 2022 - 42
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Geosynthetics August/September 2022 - 44
Geosynthetics August/September 2022 - Cover3
Geosynthetics August/September 2022 - Cover4
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