Assessment of the risk of rockfalls in Wu Gorge, Three Gorges, China

作者：Huang Bolin^*; Chen Lide; Peng Xuanming; Liu Guanning; Chen Xiaoting; Dong Haogang; Lei Tianci

来源：Landslides, 2010, 7(1): 1-11.

DOI：10.1007/s10346-009-0170-7

• Wu Gorge
• Dangerous rock mass
• Hazard
• Consequence
• Rockfall-risk assessment system
• Route safety

In 2007 and 2008, six big damaging rockfalls occurred at four sites in Wu Gorge, the second gorge of the Three Gorges, China. Detailed surveys and aerial-photographic interpretation identified 104 potentially dangerous rock masses. This paper reviews previous rock-mass risk ratings, examines dangerous rock-mass structure and presents a new assessment system for rockfall risk (ASRFR) in the Wu Gorge area. The ASRFR considers 15 factors: seven factors for hazard and eight factors for consequence. Relative importance weights for these factors are ascertained using an analytic hierarchy process. Using an equation to calculate the risk, the 104 dangerous rock masses were divided into three risk groups: high risk (33 sites), medium risk (33 sites) and low risk (38 sites). The ASRFR analysis can be used to divide the shipping route through the Wu Gorge into seven courses each of one of three classes: safe-route regions, yellow-alarm regions and red-alarm regions. The system provides geological information and a rockfall-risk management tool for local government and the shipment-route department.

• 出版日期2010-3