2023 Volume 72 Issue 6 Pages 460-466
For Japan, one of the world's leading “disaster-prone countries,” measures are required to reduce or prevent damage caused by disasters as much as possible to ensure the people's safe and secure lives. As a measure of that, developing a solid transportation infrastructure and a lifeline is indispensable. Against this background, this paper considers road-slanting surface countermeasures that assess the soundness of lifelines often constructed along roads, using the mountainous areas of Kochi Prefecture as a model. On that basis, we proposed a new "rock-fall countermeasure construction method" (from now on referred to as "ORN method") that is effective and highly versatile in preventing road slope collapse and rock-fall events. Specifically, we planned to increase the space between props so that it could be applied to valley-shaped slopes and to strengthen the potential absorbed energy by adding reinforcing ropes. In addition, the outline and design calculation results of this ORN construction method were presented, structural rationality was explained through the consequences of full-scale model experiments, and the effect of improving regional disaster prevention resilience by adopting the construction method was also mentioned
