The Mechanism of Shiaolin Landslide Induced by Typhoon Morakot

• Main Authors: Li-Sheng Chou, 周立生
• Other Authors: Meei-Ling Lin
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/48180456044096213994

碩士 === 國立臺灣大學 === 土木工程學研究所 === 102 === 　Typhoon Morakot hit Taiwan on 8 Aug. 2009 and brought over 2,000 mm accumulated rainfall in southern Taiwan. Under this extreme rainfall condition, Shiaolin Landslide occurred in the early morning on 9 Aug. 2009. The landslide volume of Shiaolin Landslide is about 25 million m3 and caused over 400 victims in Shiaolin Village. This research will identify failure mechanism and conduct stability analysis of Shiaolin Landslide and possible critical condition. 　To understand the mechanism of Shiaolin Landslide, the 3D topographic analysis, PIV analysis, slope &; aspect analysis and attitude analysis were conducted, and comparisons of results were made to identify the failure type of Shiaolin Landslide. Meanwhile, the Shialin field investigation provided evidences for interpretation of the failure type of landslide. 　After the failure type is confirmed, the stability analysis were conducted. The seepage water table of the slope, the effects of ground water change induced by fault gauge, and the strength reduction of rock mass were considered in the detailed analysis. 　The results suggested that Shiaolin Landslide was a wedge failure controlled event. Stability of slope were analyzed to understand the critical state of Shiaolin Landslide in various conditions of ground water table and strength reduction of rock mass.