Hybrid rockfall barriers combine the energy absorption capabilities of a dynamic rockfall barrier with the reduced-maintenance advantages of drapery mesh. The aim of this innovative design is not to capture and stop the falling rocks, as the barriers tested according to ETAG 027 (EOTA 2008), but to contain the bounce of the rock and to drive it down the slope beneath the mesh draped down the slope face. Although this type of rockfall structure has already been applied worldwide, there is still a lack of knowledge in the design methodology. The purpose of this paper is to present a simplified model to design hybrid barriers based on the field experiences and research carried out by the Colorado Department of Transportation, "Colorado's full-scale field testing of rockfall attenuator system" (Arndt et al. 2009), giving designers a tool for sizing both the structure in elevation that the interception structure (net) and assessing the forces transmitted to the foundations. https://papers.acg.uwa.edu.au/p/1604_24_Cerro/ Hybrid rockfall barrier-new design methodology based on the Colorado full-scale test experience M Cerro et al.
The efficacy of erosion control systems depends on preventing soil loss underneath and maintaining its integrity under the effects of the water flow. The paper presents the research results at the Colorado State University on the performance of double twisted wire mesh products, known as Reno Mattresses, used as soil erosion control systems. Mattresses were subjected to various flow conditions on a 10 m long flume placed on a soil layer. The performance against erosion was evaluated by assessing the effect of the stone motion inside the mattress combined with the condition of incipient soil erosion underneath, in relationship to the mattress thickness, the filling stone properties, and under variable hydraulic flow regimes. At the same time, confirming the stability obtained using the conventional tractive force design approach, the research results allowed to introduce a new performance limit based on incipient soil erosion underneath the revetment. Based on the research results, the authors propose to express the shear resistance of mattresses used as soil erosion control systems as a function of the filling stones’ size, uniformity, unit weight, mattress thickness, and the presence of vertical strengthening elements.
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