Geosynthetics April/May 2021 - 18

Development of a new design method for geosynthetic-reinforced RPEs

FIGURE 2 The reinforced soil rock fall protection embankment along the Simplon Road: View of the
vegetated embankment showing the cross-section

FIGURE 3 Aerial view showing the embankment protecting the Simplon Road and viaduct (from
Rimoldi et al. 2008). 66-foot (20-m) high RPE with impact resistance equal to 15,000 kJ. Courtesy
of Alpe Adria Textil, Italy
18

Geosynthetics | April May 2021

limiting the footprint of the embankment
and the ability to resist higher impacts.
Academics and engineers have
attempted modeling the behavior of
RPEs in order to provide design guidance; however, due to the variability of
geometry, fill material, embankment
construction, various reinforcement
options, interactions between soil and
reinforcement, and the dynamic behavior
of the soil, a consistent design procedure
has not been developed.
The most comprehensive guidelines
available worldwide for RPEs are the
Italian ones (UNI 11211-4:2018) and
the Austrian ones (ONR 24810:2020).
In t hes e st andards, RPE s can b e
reinforced either with steel or geosynthetics, and it is clear in both standards
that reinforcement layers significantly
improve the ability of an embankment
to withstand impacts.
However, neither standard specifies
nor considers the reinforcement performance. As a consequence, without
clear instructions, engineers seek support by reinforcement manufacturers
or suppliers capable of providing data
or numerical models coming from realscale test results.
For example, the Italian standard UNI
11211-4:2018 provides recommendations
for the input data required for the design
of RPEs. But it is not specified how to use
the input data for verifying the structure
response to a given impact. It is nevertheless indicated that the block penetration
should be compared with the RPE width.
The design corresponds to the case of a
given single block volume in a release
area. The design of the RPE relies on the
impact height and the kinetic energy of
the design block as obtained from statistical elaboration of trajectory simulations
(Figure 3).
Numerical models, either done with
finite element method (FEM) or discrete
element method (DEM), can be useful



Geosynthetics April/May 2021

Table of Contents for the Digital Edition of Geosynthetics April/May 2021

Geosynthetics April/May 2021 - Cover1
Geosynthetics April/May 2021 - Cover2
Geosynthetics April/May 2021 - 1
Geosynthetics April/May 2021 - 2
Geosynthetics April/May 2021 - 3
Geosynthetics April/May 2021 - 4
Geosynthetics April/May 2021 - 5
Geosynthetics April/May 2021 - 6
Geosynthetics April/May 2021 - 7
Geosynthetics April/May 2021 - 8
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Geosynthetics April/May 2021 - 30
Geosynthetics April/May 2021 - 31
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Geosynthetics April/May 2021 - 34
Geosynthetics April/May 2021 - 35
Geosynthetics April/May 2021 - 36
Geosynthetics April/May 2021 - 37
Geosynthetics April/May 2021 - 38
Geosynthetics April/May 2021 - 39
Geosynthetics April/May 2021 - 40
Geosynthetics April/May 2021 - 41
Geosynthetics April/May 2021 - 42
Geosynthetics April/May 2021 - 43
Geosynthetics April/May 2021 - 44
Geosynthetics April/May 2021 - Cover3
Geosynthetics April/May 2021 - Cover4
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-december-2021-january-2022
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-october-november-2021
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https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-june-july-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-april-may-2021
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