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Rockfall Defence is collaborating with the Department of Structural Engineering at the Politecnico di Milano for the development of a new software for an accurate analysis of the behavior of Rocklfall Sheds in relation to the characteristics of the shock-absorbing cushion.
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ROCKFALL GALLERIES - PRESENTATION
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ROCKFALL GALLERIESA NEW APPROACH
rev. 1.1 - 26/05/2009 Piazza delle Erbe, 1 • I-38017 Mezzolombardo (TN) ItalyTel. +39 0461.60.55.28 • Fax +39 0461.18.60.182
web: www.rockfalldefence.com • email: [email protected]
Structural Engineering Department
Politecnico Milano
In collaboration with
ROCKFALL GALLERIES - PRESENTATION
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DEFENSIVE WORKS:A “passive” defensive infrastructure which solves, often once and for all, the problems related to falling rocks by diverting– and also stopping –
the boulder trajectory
ROCKFALL GALLERY
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ROCKFALL GALLERYFACTS: a concrete or steel structure + covering layer with a damping function (cushion layer)
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ROCKFALL GALLERYstandard project
• Problems during the design phase…– Empirical formulae (Kar-Montani)– Overestimation of the impact of forces on the
structure …lead to
Structures with a strong visual impactHeavy structures >>> global stability
Difficulties in setting up building yardsStructures with a limited architectural value
Long completion timeHigh costs
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ROCKFALL GALLERYNEW APPROACH
Real-size experiments (test scale 1:1)Numerical simulations with distinct elements
Decoupling of the impact phenomenon
INTERACTION
BETWEEN BLOCK AND CUSHION
TRANSMISSION
MATERIAL CUSHION
RESPONSE
STRESSSTRUCTURE
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ROCKFALL GALLERY NEW APPROACH- SOFTWARE
Software inputs• Block dimensions• Impact speed• Cushion thickness• Cushion typology* (material)
Outputs
Cushion stress data* The mixture of materials in the cushion has a considerable impact on the system performance rate
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ROCKFALL GALLERY NEW APPROACH - OPTIMIZATION
Results from the analysis of cushion stress:• Response of the slab• Reflected wave of the slab• 3D stress on the structure
Objectives• Optimized slab• Improved efficiency
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ROCKFALL GALLERY NEW APPROACH – NEW STRUCTURES
The propagation of the effort stands at the basis of the choice for the ideal type of gallery
– Arched gallery– Shelf tunnels– Polycentric galleries
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ROCKFALL GALLERY NEW APPROACH – NEW MATERIALS
• Materials for the cushion:• Multi-layer components• Damping 3D cells• High dissipation material• Integration with geosynthetic materials, metal grid
• Material for the structure:• Concrete• Steel• New dissipating elements• Bar tie rods/ strand tie rods / post tension cables
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ROCKFALL GALLERY NEW APPROACH – BENEFITS
• An overall efficient work
• Light structure
• Better environment integration
• An easy set up of building yards
• Aesthetically satisfying architecture
• Reduced completion time
• Reduced costs
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+39.0461.60.55.28
THANK YOU FOR YOUR ATTENTION
