Geosynthetics October/November 2020 - 34

A geosynthetic wrap-face vegetated wall system

During this high-water period, work
proceeded on the bridge abutments by
starting installation of the micropiles
and pile caps directly behind the previously installed sheet-pile walls. This
work extended until completion in early
August. The receding floodwaters caused
no noticeable damage to the GWFV
walls. The second phase of embankment
construction commenced in mid-August.

FIGURE 8 GWFV wall tie-in at west bridge abutment

FIGURE 9 Completed west bridge embankment in September 2018
34

GWFV wall tie-in at sheet-pile walls
To tie in the GWFV walls to the structural walls at the bridge abutments (i.e.,
steel sheet-pile walls and concrete pile
caps), the HPTRM lifts were curved into
and behind the sheet piles up to the elevation at the top of the piles (Figure 8).
Wrap lifts higher than that were curved
into the concrete pile cap. The curves
were accomplished by cutting the bottom
and top wraps perpendicular to the face,
then pulling the HPTRM across itself
(overlap) to form the desired curves, with
internal braces spaced as needed to retain
the shape.
Vegetating the GWFV walls
In addition to the grass-seed mixture
applied internally to the wrap lifts, project specifications also called for planting
selected shrubs or vines during the fall
of 2018. These rootstock plants were
inserted through slits cut into the ministeps along the wrap-lift edges. Examples
of the plant species included wood's rose,
honeysuckle, snowberry and wild clematis. The grass mix contained primarily
rhizomatous species, which reproduce
and spread through runners just beneath
the ground surface (Figure 9).
The project area, located north of
Newport, Wash., receives an average
annual precipitation of 28 inches (711
mm). The selected plant species are
well-adapted to the area and should
have a good survival rate once they are
established. The county considered the

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Geosynthetics October/November 2020

Table of Contents for the Digital Edition of Geosynthetics October/November 2020

Geosynthetics October/November 2020 - Cover1
Geosynthetics October/November 2020 - Cover2
Geosynthetics October/November 2020 - 1
Geosynthetics October/November 2020 - 2
Geosynthetics October/November 2020 - 3
Geosynthetics October/November 2020 - 4
Geosynthetics October/November 2020 - 5
Geosynthetics October/November 2020 - 6
Geosynthetics October/November 2020 - 7
Geosynthetics October/November 2020 - 8
Geosynthetics October/November 2020 - 9
Geosynthetics October/November 2020 - 10
Geosynthetics October/November 2020 - 11
Geosynthetics October/November 2020 - 12
Geosynthetics October/November 2020 - 13
Geosynthetics October/November 2020 - 14
Geosynthetics October/November 2020 - 15
Geosynthetics October/November 2020 - 16
Geosynthetics October/November 2020 - 17
Geosynthetics October/November 2020 - 18
Geosynthetics October/November 2020 - 19
Geosynthetics October/November 2020 - 20
Geosynthetics October/November 2020 - 21
Geosynthetics October/November 2020 - 22
Geosynthetics October/November 2020 - 23
Geosynthetics October/November 2020 - 24
Geosynthetics October/November 2020 - 25
Geosynthetics October/November 2020 - 26
Geosynthetics October/November 2020 - 27
Geosynthetics October/November 2020 - 28
Geosynthetics October/November 2020 - 29
Geosynthetics October/November 2020 - 30
Geosynthetics October/November 2020 - 31
Geosynthetics October/November 2020 - 32
Geosynthetics October/November 2020 - 33
Geosynthetics October/November 2020 - 34
Geosynthetics October/November 2020 - 35
Geosynthetics October/November 2020 - 36
Geosynthetics October/November 2020 - 37
Geosynthetics October/November 2020 - 38
Geosynthetics October/November 2020 - 39
Geosynthetics October/November 2020 - 40
Geosynthetics October/November 2020 - 41
Geosynthetics October/November 2020 - 42
Geosynthetics October/November 2020 - 43
Geosynthetics October/November 2020 - 44
Geosynthetics October/November 2020 - 45
Geosynthetics October/November 2020 - 46
Geosynthetics October/November 2020 - 47
Geosynthetics October/November 2020 - 48
Geosynthetics October/November 2020 - Cover3
Geosynthetics October/November 2020 - Cover4
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 1
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 2
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 3
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 4
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 5
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 6
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 7
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 8
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