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題 名 | 深層岩體潛移邊坡滑動行為研究--以廬山地滑為例=Deep Seated Creep Deformation of a Slate Rock Slope--A Case Study of Landslide in Lushan Area |
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作 者 | 林俐玲; 黃振全; 顏呈仰; 黃貞凱; 鄭裕適; 張益通; | 書刊名 | 水土保持學報 |
卷 期 | 42:1 2010.03[民99.03] |
頁 次 | 頁1-14 |
分類號 | 434.273 |
關鍵詞 | 地滑; 潛移作用; 板岩; Geological investigation; Slate; Slope; Sliding; |
語 文 | 中文(Chinese) |
中文摘要 | 廬山層為台灣脊樑山脈區西翼之厚層板岩分佈區,因劈理發達,容易沿劈理扭曲及碎裂, 國內著名之邊坡滑動災害,如梨山、力行產業道路沿線等,多與此板岩特性有關。經研究變質 岩區山坡,其葉理(劈理、片理)發達的特性,常使岩體受重力作用產生葉理位態變化,進而引 發重力潛移作用。廬山地滑邊坡為一高傾角順向葉理岩坡深層潛移運動之典型案例。 由調查結果顯示,豪雨造成地下水入滲為本邊坡滑動之主因。因為岩性分佈的影響,使得 坡體中央存有厚層風化板岩;暴雨時地下水入滲此一區域積蓄,並使孔隙水壓力上昇,導致有 效應力下降,進而降低滑動面剪力強度,觸發潛移作用。 經由岩心劈理位態發現,滑動面附近的劈理面常呈高角度傾角,顯示岩體在潛移作用下使 劈理位態發生變化,滑動深度可能達到80公尺以上。板岩地質特性為國內高山地區工程推動常 面臨之重要課題,期以廬山地滑邊坡於板岩地層之調查成果,供後續相關應用之參考。 |
英文摘要 | Lushan formation was found in thick slate region around the west flank of Taiwan Central Range. The rock slopes tend to deform or fracture along the well-developed slate cleavages, for example, Lishan and Lishin road etc. Studies show metamorphic rock slopes with well-developed foliations (i.e. cleavage or schistosity) tend to creep by gravity with changes of orientations of foliations. Lushan landslide demonstrates a typical deep-seated creep deformation of a slate rock slope with high dip angles. The study shows the ground water infiltration brought up by torrential rain is the major cause of sliding. There is a layer of thick weathered slate around the center of the slope. The ground water accumulated in this area during rain storms causing higher pore pressure and lower effective stress. The creep of the slope was then triggered by relatively lower shear strength compared with increasing total stress of the slope added by ground water. The orientations of rock samples show a trend of high dip angles around the sliding cleavages. It demonstrates a cleavage orientation change due to a slope creep and up to 80 meters deep. Overall, the geological character of slate is a significant engineering issue in mountain area of Taiwan. This study provides useful information for future engineering projects in slate area. |
本系統中英文摘要資訊取自各篇刊載內容。