臺灣南部橫貫公路向陽－初來段之構造與邊坡穩定

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題名:	臺灣南部橫貫公路向陽－初來段之構造與邊坡穩定
作者:	王思驊;Wang,Szu-Hua
貢獻者:	地球科學學系
關鍵詞:	南部橫貫公路;地質構造;崩塌地;邊坡穩定
日期:	2013-01-30
上傳時間:	2013-03-25 15:56:12 (UTC+8)
出版者:	國立中央大學
摘要:	臺灣南部橫貫公路東段新武呂溪流域抬升快速且侵蝕速率高，公路旁之邊坡時常伴隨大量降雨發生山崩與土石流事件，造成生命或財產的損失。本研究透過航照影像判釋、野外實地調查與邊坡穩定分析，研究本公路向陽至初來路段受地質構造與邊坡組成材料影響之邊坡穩定，並探討不穩定邊坡的型態與可能的崩塌模式。本區之不穩定邊坡可大致分為三類：1）基岩不連續面與邊坡位態共同構成之不穩定邊坡；2）由崩積層、風化層或河流卅土石流堆積物等鬆散且膠結差的地質材料組成之邊坡；3）受斷層或剪切帶影響之破碎岩層。初步觀察及分析結果顯示，研究區域內第一類型邊坡包括順向坡與翻覆型邊坡，其中又以前者的分布地區較多。於航照圖及衛星影像上較清楚顯示的崩塌地多發生於第三類型邊坡，沿主要剪切帶分布，其中新武及利稻的崩塌地明顯呈現線型分布，並與剪切帶位置大約一致。崩塌地坡向多朝東南方，與斷層及剪切帶的傾向大致相同。另外，多數山崩出現於砂岩與板岩或千枚岩互層的地區。綜合上述現象，本研究初步判斷南橫公路東段沿線之山崩空間分布與地質構造及岩性具有高度相關性。本研究結果未來可應用於地區地質評估與災害防治等議題。In the regions neighboring the Xinwulu River, flowing along the eastern part of the Southern Cross-Island Highway, high uplift and erosion rates were calculated in previous studies. Landslides and debris flows, often following heavy rain, occur on slopes near the highway, causing damages of life. In this study, we used aero photos, digital elevation models, field investigations and slope stability analysis to study how geologic structures and materials on slopes affect the slope instabilities along the section of the highway between Xiangyang and Chulai, trying to find out the ways landslides might occur.In our study area, instable slopes are categorized into three types: 1) combinations of the attitude of geologic structures and slopes in bedrocks causing instable slopes; 2) slopes composed of poorly cemented materials; 3) fractured rocks affected by shear zones or faults. According to our observations and analyses, most landslides are developed along major faults or shear zones. In Xinwu and Lidao, the positions of landslides form linear patterns, corresponding with the shear zones. Landslides are generally facing southeast in this area, coinciding with dip directions of most faults and shear zones. While considering the lithology, few landslides are distributed along the area majorly consisting of schists between Xinwu and Wulu, whereas most of these features are developed in sandstone beds interlayered with slates or phyllites. Thus, we conclude that the distribution of landslides is highly related to geologic structures and lithology along the Southern Cross-Island Highway. The results provide us a concept which can be applied to hazard evaluation and prevention in the future.
顯示於類別:	[地球物理研究所] 博碩士論文

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