5Committee on Climate Change and U.S. Transporta- tion, Transportation Research Board and Division on Earth and Life Studies. Potential Impacts of Climate Change on U. S. Transportation [R]. Transportation Research Board of the National Academics, Washing- ton D. C. , 2008.
6Transport Canada. Climate Change Impacts and Adap- tation: A Canadian Perspective, Ottawa, Canada, 2004. European Environment Agency[R]. Vulnerabil- ity and Adaptation to Climate Change in Europe. Co- penhagen, Denmark, 2005,.
7Cox Jr L A. What's wrong with risk matrix [J]. Risk Analysis, 2008, 28(2)1497.
8Eskesen S D, Tengborg P, Kampmann J, el al. Guidelines for tunnelling risk management: interna- tional tunneling association, working group No. 2 [J]. Tunnelling and Underground Space Technology, 2004, 19:217.
9Ayyuh B M. Risk analysis in engineering and eco- nomics [M]. Baca Raton: Chapman&Hall /CRC Press,2003.
10Franks A P, Maddison T. A simplified method for the estimation of individual risk [J]. Process Safety and Environmental Protection, 2006,84(B2) : 101.