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Numerical modelling of rockfall on protection galleries

Abstract:

Rockfalls are one of the most prevailing natural hazards in the mountainous regions in Switzerland. Concrete protection galleries are used to protect the local infrastructure and lifelines against these potential rock impacts. Innovative solutions have been proposed for the cushion materials that are laid on these galleries to absorb the rockfall impact energy, as it is one of the main input parameters in the design of the protection gallery. The vertical and inclined impact of the rockfall on cushion material on a concrete slab is modelled using the finite element program LS-DYNA. Parameters such as mass of the rock, falling height, angle of impact, cushion material have been varied in the numerical simulations. The numerical model is validated with the results of centrifuge modelling mainly for vertical impact events. The response of the cushion material for a specific energy of the rockfall is also compared using numerical and centrifuge modelling.

Authors:

Chikatamarla, Ravikiran and Laue, Jan and Springman, Sarah M.

Index Terms:

Soil; SoilGroup; rock avalanches; Protection Structures; galeries; Chikatamarla, Ravikiran; Laue, Jan; Springman, Sarah M.

Further Information:

Date published: 2005