The highway BR 163 near the city Nobres, Mato Grosso State in Brazil has slopes with falling arenite blocks (fig. 1). The solution to this problem was a metallic mesh with a patterned of anchors. The software MACRO 1, from Maccaferri, was used to design the system. A secured drapery system, consisting of rockfall netting and a systematic nailing scheme, is designed to stabilize surficial material on an exposed rock face. The design procedure can be very complicated because the geomechanical models are very complex or unrealistic, and obtaining accurate input data is rather problematic. This paper presents a simple design approach for secured drapery system, which combines the field experience of geologists and engineers on one hand, and the results of full scale drapery field tests on the other.
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