New approach for designing Rockfall Galleries

ROCKFALL GALLERIES A NEW APPROACH rev. 1.1 - 26/05/2009 Piazza delle Erbe, 1 • I-38017 Mezzolombardo (TN) Italy Tel. +39 0461.60.55.28 • Fax +39 0461.18.60.182 web: www.rockfalldefence.com • email: info@rockfalldefence.com Structural Engineering Department Politecnico Milano In collaboration with

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

ROCKFALL GALLERY FACTS: a concrete or steel structure + covering layer with a damping function ( cushion layer )

ROCKFALL GALLERY standard 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 impact Heavy structures >>> global stability Difficulties in setting up building yards Structures with a limited architectural value Long completion time High costs

ROCKFALL GALLERY NEW 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 STRESS STRUCTURE

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

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

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

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

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

[email_address] www.rockfalldefence.com +39.0461.60.55.28 THANK YOU FOR YOUR ATTENTION

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New approach for designing Rockfall Galleries

by Rockfall Defence on Feb 04, 2010

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New approach for designing Rockfall Galleries — Presentation Transcript