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Slope presenting geotechnical instability,
widespread erosion, sliding and large sediment carriage volume.
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The nailed green soil confinement technique was
applied using the bidimensional coconut fiber anti-erosion biodegradable blanket (Fibrax
Screen 400BF).
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Same site following application of the techniques
demonstrating efficiency and visual improvement, together with correction of environmental
aspects such as water infiltration, solar radiation and temperature.
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Slope confinement may be dealt with using a variety of
techniques, tecnology and materials. Expert knowledge is required for the right choice in
each case. Usually embankment slope instability include mass movement from a fragile
zone. Efficient confinement action is required in such cases, such as tied curtains,
nailed soil, retaining walls and others.
PROBLEM
A slope showing general instability, widespread erosion, sliding, mass movement and
limited space for earth works and equipment. Shotcrete was originally applied over the
slope surface, but results were not forthcoming. The agency responsible for the operations
required eliminating earth movement, improving the view and greater efficiency compared to
previous results.
SOLUTION
The nailed green soil system, used to stabilize soil or rock slopes, was chosen. The
surface to be stabilized is straightened, hydrosowed and protected using a coconut fiber
anti-erosion biodegradable blanket. The surface is then covered with a high resistance
steel mesh anchored to pre-sized and steel plate pre-stressed (with a specific force)
nails. On reacting to tension, the steel mesh is forced against the slope, thus avoiding
deformation, sliding and local fractures. The external tension increases system safety and
efficiency.
RESULTS
After concluding the nailed green soil system, there was no erosion even during
strong rainfall. This is due to plant roots reaching different soil layer depth,
anti-erosion biodegradable blanket protection, nails and a metallic mesh. Two months
later, the vegetation is well established, there is visual improvement and sliding or mass
movement has ceased. |
