Slopes with arid and rocky matrix
The soil making up a slope often has a predominantly arid matrix (due to the lack of organic material); this occurs, for example, while cutting rocky or, in some cases, arid slopes during road construction.
Under these conditions, it’s necessary to ensure that an adequate thickness of topsoil is provided to allow for the growth of vegetation. Since topsoil has poor mechanical properties it can easily slide down the slope, it could also get washed away by heavy rainfall prior to the onset of vegetative growth.
Japan: TENAX TENWEB installed
in an area subject to flooding |
Japan: TENAX TENWEB can be
cut to allow the planting of large
shrubs and trees
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Japan: Anchorage detail of
TENAX TENWEB on the slope |
Reggio Calabria (Italy)
A steep slope with anti-erosive
protection accomplished by the
use of a TENAX MS geogrids |
TENAX TENWEB geocells allow for the stabilization of the topsoil even on very steep slopes, ensuring the lateral confinement of the slope itself. Once opened to their maximum extension and filled in with lightly compacted topsoil, a stable planting structure is formed.
The surface of this layer can be further protected against superficial erosion through the use of geomats or biodegradable mats.
When eroded slopes are made from soft rocks and exhibit an unstable combination of loose rocks mixed with finer material, it’s necessary to build a secure system capable of preventing the detachment of the heavier and larger sized material and simultaneously retaining any growing medium.
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TENAX MS multi-layer geomats are particularly useful in this situation due to their high tensile strength and their dense mesh structure that is capable of molding itself to the foundation profile. This provides an effective containment system for the grassed areas, protecting the latter from erosive phenomena associated with precipitation or with non-channelled flowing waters.
Impermeable banks for canals, ponds and artificial basins
Impermeable membranes (polymeric or mineral clay) used to seal canals, ponds, and artificial basins in general, must be protected from both mechanical puncturing and from attack by UV rays, and if possible, the part above water needs to be covered by vegetation. Both these needs can be satisfied by using the TENAX TENWEB honeycomb shaped structure, capable of retaining a sufficient thickness of topsoil to ensure surface stability is maintained. The cellular structure can be filled above the water line with topsoil and, in the submerged section, with dredged gravel and/or concrete, and can be successively covered with a TENAX ECOMAT biomat and then hydro-seeded.
Brunico (BZ), Italy
TENAX TENWEB installed as liner protection for water retention pond |
Brunico (BZ), Italy
TENAX TENWEB planted with marginal plants on a river bank
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Brunico (BZ), Italy
The completed installation of TENAX TENWEB for the liner protection of a water retention pond |
Puncturing of the membrane cannot be allowed and therefore the use of fixing stakes cannot be allowed. It is therefore necessary to use a TENAX LBO SAMP reinforcing geogrid beneath the geocell panels for the dual purpose of guaranteeing the required tensile strength and allowing connection of the geocell walls by cable ties or other means. This system provides a completely stable integral structure.
The soil, confined by the honeycomb shaped structures, becomes very resistant to distributed loads and to the puncturing activity of concentrated loads. The structure in general permits the increase in the bearing capacity of the soil layer in which it is placed, offering optimal shock resistance from moving loads and therefore efficiently safeguarding the underlying impermeable layer.
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Usmate (MI), Italy:
TENAX TENWEB used to line ornamental ponds in parks and golf courses.
Ornamental pond fully grassed 10 weeks after installation of TENAX TENWEB. |
Schematic example
Legend:
1 - Original soil
2 - Top soil
3 - TENAX TENWEB geocells
4 - Biomats (if required)
5 - Geomembrane
6 - Plastic cable
7 - Geogrid (if required)
8 - Gravel |
TENAX TENWEB geocells can be used for vegetating channels and reservoirs
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