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11.10.2014

DefenCell MAC® awarded US Military Contract

07.01.2014

Bekaert and Maccaferri Establish Partnership for Underground Solutions

06.17.2014

Maccaferri Sponsors the 10th International Conference on Geosynthetics

Protection against rockfall is frequently carried out with mesh facing and patterned nails; this system is known as secured drapery. Secured Drapery can also be referred to as pinned drapery or surficial consolidation. Secured Drapery is aimed at improving the rock face stability.

The stability of the exposed rock face, reinforced with nails, is obtained by the contribution of the steel mesh. The function of the mesh in the secured drapery system is to stabilize the material between the nails by limiting rock movement. The steel mesh facing has a flexible structural behavior, within the limits of its intrinsic deformability, and works in unison with the passive action of the nails.

Secured drapery intervention is typically recommended where the number of unstable blocks is too large, and/or the maintenance cost is too high or difficult to access. This allows the nailing of each single rock, so that the surficial portion of the slope can be compared to a continuous unstable thickness. Even if the secured drapery system can improve the global stability, the solution should only be considered for surficial stability problems.

The unstable portion is usually thinner than 1.0 m (3 ft) and frequently ranges between 0.3 - 0.6 m (1 to 2 ft); it can generally be estimated by observing the thickness of the weathered/loose rock mass (typical size of the fallen blocks is also a good indication of the dimension).

The Maccaferri Advantage

• Lower maintenance costs by reducing the repairs compared to simple drapery
• Innovative knot system allows the HEA cable panel to absorb energy
• Can be installed in very limited and remote areas

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