Geosynthetics October/November 2020 - 15
The new bridge was constructed in
two phases to keep the existing railway
line in service during construction. The
design of the causeway needed to consider
effects on the existing and new bridge,
and the final design was checked to meet
Network Rail design requirements for
working adjacent to a live rail line.
Reinforced embankment solution
The final design included the results
for each section in the south and north
areas of the causeway (Figures 6 and 7
on page 16), considering all the scenarios described above. The results for the
embankment section with the maximum
height and the maximum slope angle are
described below.
* Reinforced embankment:
¶ Maximum height: 13.5 feet (4.1 m)
¶ Slope angle: 1V:2H
¶ Minimum distance to the edge: 3.3
feet (1 m)
¶ Basal reinforcement: 3 layers of
biaxial geogrid of 2,056 poundforce/foot (30 kN/m), spacing 11.8
inches (300 mm), reinforcement
length 65.6 feet (20 m)
¶ Slope reinforcement: 6 layers of
uniaxial geogrid of 3,083 poundforce/foot (45 kN/m), spacing 19.7
inches (500 mm), reinforcement
length 32.8 feet (10 m)
¶ Face protection: Woven geotextile
wraparound each layer ("C"
shape with 4.9 feet [1.5 m] at the
bottom and top of each layer plus
layer thickness)
During the construction period, the
causeway was completely submerged by
tidal activity on several occasions and
back in use for construction activity
within hours of the tidal event. To account
for these events, we extended some areas
of the embankments to include safe areas
on the ramped approaches, above the
anticipated flood levels, allowing space
for the tracked plant.
FIGURE 5 Installation of rock armor toe and starter layer with Geogrid Tenax LBOHM
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1020GS_p10-17.indd 15
15
9/22/20 12:22 AM
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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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