| Summary: | 碩士 === 國立聯合大學 === 土木與防災工程學系碩士班 === 103 === The research area in this study is located at Lu-Chang Tribe and its communication road (Miao 21th Line), in Nan-Zhuang township, Miao-Li County. In the past, the landslides of earth slopes, the chaps of retaining structures, the deformations of Miao 21th Line, and the damages of tribe’s buildings are mainly caused by the heavy rainfalls and strong typhoons, such as Herb, Zane, Allie, Matsa, Wipha, and Krosa. For example, Typhoon Allie occurred in August 2004 which brought the heavy rainfalls and hence induced severe damages to Miao 21th Line. It is proved that the research area is indeed under unstable conditions.
In this investigation, the digital terrain model from digital elevation one is adopted by using ArcGIS to establish the slope, aspect, and contour maps. Sequentially, by utilizing Surfer to convert the above-mentioned data into FLAC3D, and employing the geological drilling data of Miao-Li County Government’s project (2014) to obtain the required input parameters to simulate the stability of Lu-Chang Tribe and Miao 21th Line, respectively. The factor of safety (FS), the distributions of vertical/horizontal/shear/maximum/minimum stresses, shear strain increment, pore water pressure, vertical/horizontal/total displacements are presented. The results indicate that at Lu-Chang Tribe, the FS/vertical/horizontal/total displacements are 1.83/0.723m/1.380m/1.50m; however, at Miao 21th Line, the same ones are 1.21/0.728m/0.543m/0.822m. In addition, it is found that the higher displacements and their directions are toward the Lu-Chang and Feng-Mei Rivers. The reasons might be related to the continuous down-cutting of these two rivers.
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