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OGGERI Claudio,김상환,PEILA Daniele,PELIZZA Sebastino 사단법인 한국터널지하공간학회 2004 한국터널지하공간학회논문집 Vol.6 No.4
Tunnel portals are often located in areas where the risk of rock fall and/or detachement of rock fragments from rocky slopes is high. In this case it is necessary to design the portals so as to protect the road (i.e. using an artificial tunnel) or to instal structures that are able to intercept falling blocks on the slope. This paper deals with the design problems of these structures and includes a special analysis of net fences which have undergone a remarkable technological improvement over recent years.