https://scholars.lib.ntu.edu.tw/handle/123456789/86192
標題: | 行政院國家科學委員會專題研究計畫成果報告:水文對坡地災害因子潛勢影響分析─總計畫暨子計畫:因地震導致孔隙水壓上升對邊坡崩壞之影響(III) | 作者: | 譚義績 | 關鍵字: | 土壤抗剪強度;邊坡安全因子;濕鋒;Soil shear strength;slope factor of safety;wetting front | 公開日期: | 2004 | 出版社: | 臺北市:國立臺灣大學生物環境系統工程學系暨研究所 | 摘要: | 在邊坡土壤(有限邊坡或無限邊坡) 受到地震或是植生根系等影響之下,土 壤材料與水份移動的水力特性是相當重 要的,土壤孔隙會受到地震而產生形 變,土壤抗剪強度與特性亦會隨著水份 因乾燥、濕潤交替的歷程而發生不同的 變化,要能準確的計算邊坡安全因子, 必須在土壤孔隙變動、植生根系影響與 土壤水份乾濕歷程交替變化的環境中考 慮其變化。 本研究基於吳正雄之根力模式,加 上Bishop 法、Janbu 法與自行推導之未 飽和邊坡安全因子進行不同坡度之安全 因子分析,而植生種類則挑選台灣杉與 山黃麻,透過不同根力模式來探討未飽 和邊坡土壤在不同濕鋒入滲深度與坡度 下之安全因子;研究顯示相同坡度下有 植生邊坡之安全因子會比無植生邊坡之 安全因子來的高一點,而自行推導之未 飽和邊坡安全因子隨著水份入滲深度之 變化和Bishop 法、Janbu 法有顯著的不 同。 Under soil slope influenced by earthquake or vegetation root system, the characteristics of soil material and movement of soil water content is quite important. The pores of soil will be deformed by the earthquake. Soil shear strength and soil characteristics will produce changes with the hydrological processes (wetting or drying). In order to accurate calculation slope factor of safety, we must consider changes in the environment of variation pores of soil, vegetation root system and hydrological processes (wetting or drying). This root force model based on Wu of research, in addition, Bishop and Janbu model and unsaturated slope factor of safety derived by myself carry on the safe factor analysis of different slope. The selection of vegetation is Taiwan China fir and mountain jute, and probe into safety factor of unsaturated soil slope due to different the depth of wetting front, different slope and root force model. This research shows that safety factor of vegetation slope is a bit higher than without safety factor of vegetation slope in the same slope. But the unsaturated slope factor of safety derived by myself is obviously different from Bishop and Janbu’s model with the depth of wetting front. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/10780 | 其他識別: | 922625Z002031 | Rights: | 國立臺灣大學生物環境系統工程學系暨研究所 |
顯示於: | 生物環境系統工程學系 |
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922625Z002031.pdf | 329.55 kB | Adobe PDF | 檢視/開啟 |
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