9SφEN Degn Eskesen,Tengborg PER,JφGEN Kampmann. Guidelines for tunnelling risk management:International tunnelling association,working group No.2[J].Tunnelling and Underground Space Technology,2004.217-237.
10Cancelli A,Crosta G. Hazardand risk assessment in rock fall proneareas[A].London:Institute of Civil Engineering,1993.177-190.
