View of completed TENAX TT geogrid reinforced soil bunds
The construction of a cargo railway at Marchwood Military
Port in Southampton, UK, required the establishment of two
barriers to act as noise bunds and also as a curtain to shield
unsightly unloading operations.
Installation procedure using removable formwork panels
Several options were considered when designing the bunds,
but the reinforced earth option proved to be the most economical.
The length of the bunds were 330 m each with a height of 5.0
m and a base width of 5.40 m, with side slopes at 71.5°.
The foundation soils was comprised of alluvium deposits with
low shear strengths.
Therefore the Consultants, TBV, decided
to improve the bearing capacity by vibrocompaction technique.
TENAX technical team were approached for the design of the
reinforced earth bunds.
The design included the use of readily
available fine sand fill reinforced with TENAX TT 301 SAMP
geogrids as primary reinforcement wrapped around the face.
Secondary reinforcement using TENAX LBO 201 SAMP was used
to add stability within and to the face of the slope.
construction of the bunds was accomplished by laying the geogrids,
at the base of the bunds, followed by placing of the fill
soil with the use of a JCB, spreading the fill soil, and then
compaction of the fill by a hand operated vibrating compactor.
A geotextile fabric was placed underside of the geogrids to
prevent the filtration of the fine particles.
The facing of
the slopes were then covered with artificial grass made of
Completed bund using TENAX TT geogrids
The use of TENAX geogrids in reinforcing the earth bunds,
- the construction of the bunds with steep slopes thus minimizing
- fast construction, using standard plant;
- the use of available soil, in this case fine sand;
- a most economical solution.