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SUMMARYThis paper considers recent contributions concerning metallic structures designed to stop rockfalls. These structures are composed of metallic nets generally made with anti-submarine rings. Both the singular technology and the spatial array of the rings confer outstanding mechanical properties to the net sheets, which are used today in order to control rockfall trajectories. A spatial description of the net is proposed, and a constitutive modelling in "nite strains is presented. The proposed modelling is based on both the experimental and analytical approaches. But the main feature of this modelling is that the local behaviour of the net can be described in the usual framework of elasto-plasticity. Mechanical analysis of each material body has been carried out, but the complexity of the resulting system imposed the building of a numerical scheme. Finally, this research has led to the development of original computational software, for both industrial and academic purposes. In order to give a clear indication of the capacity of both the modelling and the computational software, a typical example of a simulation is proposed and discussed.

R~s u M~. Cet article prksente des travaux rkcents effectuks sur le thdme des ouvrages deprotection contre les kboulernents rocheux. Apres avoir rappelk le contexte ginkral de I'itude. il prksente la demarche scientifique qui a Ptk suivie : les hypotheses sur la physique des phknomknes, les essais permettant de caler le comportement local de I 'ouvrage, la mkthode numkrique utiliske. Afin d 'explorer les capacitis du code de calcul, quelques exemples sont ensuite proposks. AI]S7'mc7: This paper deals with recent research concerning rockfall restraining nets Afrer a presentation of the general context of the study, the scientific approach is described in details including: the assumptions about physical phenomena involved, the experiments used to appreciate the local behaviour of the structure, and the numerical method employed. In order to give a clear indication of the capacity of the software, several examples are discussed. Mo1x-cL.& : risques naturels, kboulements rocheux. filets pare-pierres, mkcanique des solides, loi de comporternent en grandes dkformations, calcul des structures, ilkments distincts, modklisation numkrique.

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