GPS/GIS Applied on the Establishment of Potential Disaster Model for Tai-3 Highway in Southern Taiwan

• Main Authors: Liaw Huang Ching, 廖凰卿
• Other Authors: Tsai, Kuang-Jung
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/79969759382158184322

碩士 === 國立屏東科技大學 === 土木工程系碩士班 === 92 === The southern Tai-3 highway with 180 kilometers in length starts from PingTung City and runs north to the Meishan Xian in Jiayi county. It is one of the important traffic network in southern Taiwan. The studied section passes Meishanxian, Yujingxian, Nanhuaxian, Chishanxian, and Jiuzuxian where cover 12 township. The total length in the investigated section is approximately 165 kilometers. It runs through Terrace Deposits, Gutingkeng, Beiliao shale, Zhonglun, Toukoshan Hsiangshan Sandstone stratum and some other soft rock region in southern Taiwan. Weathering process of the soft rock related to typhoon rainstorm season always carry heavy rainfall intensity. This caused slope failures and seriously endanger the traffic safety of Tai-3 highway. This study was also focused on investigating the slope protection facilities and evaluating the slope stabilization combined with engineering treatments by integrating global positioning system(GPS) and geographic information system (GIS). The result shows that 203 damaged slopes were found approximately 74.86% of the total 370 slope failures being investigated in the Southern Tai-3 highway. Most of the sliding or slumping slopes occurred at the slope steepness greater than 45°of Beiliao shale and induced by slope sliding deformation of slopes and surface runoff erosion. Slope protection engineering structures were damaged with slope length greater than 10m and steepness larger than 45°, under the recovery of vegetation less than 30%. However, the statistical analysis by using both multivariate analysis, and linear regression. Which can be used to evaluate the risk of slope failures under different condition and locations of slide slope along the highway. The risk assessment model was developed on the basis of different instability index calculated by statistic inference. Based on the curves of instability index related to soil erosion and vegetation recovery. The slope instability can be evaluated and recalculated directly from the risk model. The weighing factors contributed to the slope instability were used to create the risk classification for the potential hazard of slope failures along Tai-3 highway. It is also expected that the establishment of database system for the slope failures occurred at soft rock region in southern Tai-3 highway can be fully structuralized and be applied on evaluating the risk of slope stabilization or landslide hazard mitigation in southern Taiwan.