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The benefits of Maccaferri’s Steelgrid HR Rockfall protection System

Rockfall

Mountainous areas affected by rockfall can benefit from Maccaferri’s Steelgrid HR system as proven by a recent project in a residential area known as Jalan Kasah

Rockfall protection and rockfall mitigation are key elements in the security and safety of infrastructure, mine works, buildings or people. Even small rockfalls or debris flows can block infrastructure and can have far-reaching economic effects beyond the immediate disruption. This also applies to buildings or other installations at risk of damage from rockfalls, avalanches or debris flows.

A recent project in a residential area of Medan Damansara, Kuala Lumpur, exemplifies well one example of how rockfall protection can be achieved using Maccaferri’s products. Along the Jalan Kasah, Medan Damansara, suburban area, where residents enjoy serene surroundings and lush greenery, an unsuspected danger is lurking in the upscale neighborhood.

This residential area is located about 10 km away from the city center of Kuala Lumpur. It is a beautiful hilly area, with a forest reserve sitting on one of the hill slopes. Slope failure previously occurred that prompted the Kuala Lumpur City Council to look for solutions. The height of the slope subject to scrutiny is about 50 meters high and 60 meters long, with a general slope angle of approximately 45°.

It is located on a Kenny Hill formation that is made up of a mixture of soil and rock or hard soil. This formation is a geological structure that has deteriorated over time. A Kenny Hill type structure can typically be found in Kuala Lumpur and the surrounding Klang Valley. The sedimentary rocks are the result of tropical corporeal deterioration that steadily deteriorates if left unprotected.

The slope failed in two specific areas; one part is rocky whereas the other party consists of soil. Shotcrete was not recommendable seeing as the slope in question is situated very close to residential areas. Site investigations led our engineers to conclude that two different solutions were required to treat this problem.

For the rocky side of the slope, Maccaferri Steelgrid HR30 was adopted. Steelgrid HR is a high resistance woven steel mesh typically used as a rockfall protection system. High tensile steel wire ropes are interwoven longitudinally with high strength double-twist wire mesh, in this case, at 300 mm centres. Steelgrid HR is available in 30, 50 and 100 variants, each designed to offer protection for difference occasions. For the soil slope area, a Steelgrid HR30 and MacMat combination were used. MacMat is a polypropylene three-dimensional geomat, ideal to provide immediate erosion protection and to re-establish vegetation. To accelerate the revegetation process, hydro-seeding can be used to help.

Soil nailing was used to deliver deep-seated stability to the soil slope.

For more information, please contact us.

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