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題名 | 泥流驅動機制之數值分析=Numerical Analysis on Mobilization Mechanism of Mudflow |
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作者 | 陳榮河; 陳香如; 古家瑋; | 書刊名 | 工程環境會刊 |
卷期 | 32 2014.01[民103.01] |
頁次 | 頁1-22 |
分類號 | 434.273 |
關鍵詞 | 泥流; 驅動; 邊坡; 砂質土; 入滲; 數值分析; 模型試驗; Mudflow; Mobilization; Slope; Sandy soil; Infiltration; Numerical analysis; Model test; |
語文 | 中文(Chinese) |
中文摘要 | 泥流是以細粒料為主的流體,常會對鄰近山坡的社區造成災害。本研究旨在觀察砂質泥流的驅動機制,並針對凹型砂質土坡於兩種地層條件下,觀察其受坡頂漫地流入滲的過程;同時以室內試驗及數值分析進行模擬。兩組試驗於砂箱中進行,分別對均質砂土坡與底部具有傾斜不透水層的砂土坡進行研究。試驗的方式係以固定水深作用於坡頂平台進行入滲,對不飽和模型邊坡因入滲引致泥流的機制作更深入的觀察。數值分析以有限元素分析軟體(ABAQUS)模擬不飽和邊坡受坡頂水壓作用的入滲過程,以瞭解土體的孔隙壓力及應力路徑、滲流、降伏區等之發展情形,同時探討不同坡面角度的坡型對邊坡穩定的影響。最後,綜合現地案例破壞的特徵、實驗的觀察與量測、並藉由數值分析的詮釋,對不飽和砂質土坡因入滲引致泥流的破壞機制作深入的解析。 |
英文摘要 | A mudflow is a hazardous flow consisting mainly of fine grains. The flow sometimes causes damages to residential areas that located adjacent to hillsides. This study focuses on investigating the mobilization mechanism of concave, sandy-soil slopes subjected to infiltration of overland flows from the crest. The slopes considered were both homogeneous and nonhomogeneous. Laboratory tests along with numerical analysis were employed to study the mobilization of the mudflow induced by overland flows infiltrating into partially saturated slopes. Model tests were conducted on two sandy-soil slopes constructed in a sandbox; one of the slopes was homogeneous, and the other had an impervious dip-stratum at the bottom. Both slopes were subjected to water infiltrating from the crest. The characteristics of the mobilization mechanism were observed. Numerical analysis was then performed using the finite-element software, ABAQUS, which simulates the water infiltration by applying a constant pressure head at top of the slope. During the infiltration process, the pore pressure and the stress-path of soil, seepage, as well as the yield zone in the slope were observed. Moreover, slopes with different combinations of upper and lower slope angles were analyzed. In the end, the mobilization mechanism of mudflow is investigated through the results from the case history, model test, and numerical analysis. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。