Risk Assessment of Rockfall Hazards on Highways
With the rapid development of the west regions in China, a great number of highways are being or will be built in western mountainous regions. Rockfalls constitute a major hazard in numerous adjacent rock cuts or steep natural rock slopes along these highways. Based on the concept, the connotations, extensions and characteristics of rockfall are discussed and the triggering mechanism is analyzed. The previous relative rockfall rating systems widely accepted are introduced. Based on the Italian modified rockfall hazard rating system, the weights of all categories used to assess rockfall risk are introduced to enhance the major categories and weaken the minor categories. On the basis of the expert investigation, the weight vector can be calculated through analytic hierarchy process method. An application of the modified method to a rock cut slope of Shuifu-Maliuwan highway in Yunnan Province was developed. The heavy annual rainfall and high rockfall frequency with great weights affect this studied slope very much. Rockfalls may cause a large amount of casualties and traffic accidents or interruptions, as well as damage in this interval. Therefore, for this rock cut slope, the analysis shows that the risk is unacceptable and should be reduced using urgent remedial measures.
Z.H.Li H.W.Huang J.Yin
Dep.Of Geotechnical Engineering, Tongji University, Shanghai, China
国际会议
上海
英文
2007-10-18（万方平台首次上网日期，不代表论文的发表时间）