Geosynthetics June/July 2019 - 36

Streambank restoration using engineered bank stabilization

FIGURE 5 Typical configuration of a stacked EBS gravity-wall system

FIGURE 6 Coarse gravel infill used in base row of the EBS units

36

Geosynthetics | June July 2019

The HPTRM wrap is fastened to each
rigid cell to provide a flexible exterior that
controls erosion while providing sufficient
tensile strength and UV resistance for excellent long-term performance. Additionally, it
forms pockets that can be filled with mulch
or other media to promote and sustain vegetation. The durable geotextile lining allows
the rigid cells to be filled with soil, sand,
gravel, crushed rock and other granular
material. The units (bastions) can be stacked
on top of each other, using a setback distance
of 0.5-1.5 feet (15-46 cm), thus forming
walls up to 12 feet (3.6 m) high (Figure 5).
The EBS system walls must be founded
directly on native soil or approved structural fill. In most cases, subgrade preparation involves using an excavator with
a smooth-blade bucket to remove topsoil and organic detritus to reach native,
undisturbed soil and provide a smooth
shallow trench to place the initial row. If
the foundation soil comprises clay or elastic silt, which are moisture-sensitive soils,
or the design requires a more frictional
base, then a compacted gravel leveling pad
should be placed. Additionally, a drainage
pipe system to remove excess groundwater
at the base of the wall should be installed
in conjunction with the foundation. If a
foundation drain pipe is used, then it must
have a proper outlet for water disposal or
conveyance to low points. For sites prone
to water submergence, the first row of
bastions can be filled with coarse gravel
to allow free movement of water without
pore-pressure buildup (Figure 6).
It is recommended that soil infill
for the EBS system meet the following
specifications:
* Classified as GM, GW-GM, SM, SW-SM,
SC-SM, CL-ML or ML using the Unified
Soil Classification System (USCS)
* Contains maximum particle size of 3
inches (7.6 cm)
* Has a plasticity index (PI) of fines not
exceeding 10 and a liquid limit not
exceeding 30



Geosynthetics June/July 2019

Table of Contents for the Digital Edition of Geosynthetics June/July 2019

Geosynthetics June/July 2019 - Cover1
Geosynthetics June/July 2019 - Cover2
Geosynthetics June/July 2019 - 1
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