Use of the event tree to assess the risk reduction obtained from rockfall protection devices

The paper presents and discusses a procedure for the evaluation of the collective risk that can affect a road sub- jected to rockfalls, with and without protection measures, by means of the event tree analysis. This tool is useful to show designers whether the rockfall protection structures are lo- cated in the correct positions, whether they are the correct technological choice and what level of reduction of risk can be obtained. Different design options can therefore be com- pared on the same bases.

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