This paper proposes a new technique, which uses the high energy absorption net to upgrade the performance of existing rockfall protection fence. The high energy absorption net is set behind of the existing rockfall protection fence in this technique. In order to confirm the applicability of the proposed technique, field tests and numerical analyses are carried out. This paper describes the detail of the proposed technique and the results of the field tests and the numerical analyses as well as the effectiveness of the high energy absorption net to upgrade the performance of the existing rockfall protection fence.
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