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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/947

    Title: 圓柱堆變形破壞與流體化現象之輸送帶實驗分析;The Phenomenal Analysis Of Deformation And Fluidization With Assemble Cylinders In The Conveyor Belt Experiment
    Authors: 張耀文;Yao-Wen Chang
    Contributors: 土木工程研究所
    Keywords: 變形破壞;圓柱;輸送帶;影像分析;孔隙率;流體化;porosity;image algorithm;deformation;fluidization;conveyor belt;cylinder
    Date: 2004-06-15
    Issue Date: 2009-09-18 17:16:15 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 本研究以輸送帶渠槽帶動圓柱來進行實驗,以模擬斜坡上崩塌土體轉換化為土石流中間的過程。實驗分為微觀的結構變形破壞實驗以及巨觀的流體化實驗二部分。 在結構變形破壞實驗部分藉由兩種不同速度(4.17cm/s、12.34cm/s)、兩種坡度(0°、20°)以及兩種隔板高度(0cm、2.2cm)搭配成各種不同實驗條件來進行,進而使用Voronoï影像分析法來觀察圓柱堆結構底部受剪力時的變形破壞以及破壞前、穩定後的孔隙率變化。結果發現速度12.34cm/s時破壞的範圍大於速度4.17cm/s,且當坡度為20°時,上層圓柱容易因坡度影響向左側傾斜。而孔隙率較大處容易發生破壞;最後達到穩定時,孔隙率則因排列方式由鬆散排列逐漸變成最密堆積排列而逐漸變小。 而流體化實驗部份則是利用兩種不同速度(4.17cm/s、12.34cm/s)、五種坡度(0°、5°、10°、15°、20°)以及兩種隔板高度(2.2cm、3.8cm)與三種圓柱堆初始厚度(3D、5D、10D)搭配成36組不同的實驗條件來進行,並以圓柱基本運動型態與無因次流體化層厚度隨時間的變化量以及圓柱流出侷限區域之順序進行分析與探討。結果發現速度為12.34cm/s之圓柱堆基本運動型態不同於速度為4.17cm/s時,且進而影響流體化層厚度隨時間的變化量,使得相同坡度下、不同初始厚度之結果剛好相反;而圓柱流出的順序則與隔板高度關係大;隔板低時,圓柱先由底部與左側先流出,隨著隔板高度的提高,圓柱大部分則先由右側流出。 This study performs experimental work with cylinders on the conveyor belt to simulate the process of landslide induced debris flow. The experimental set up consists of two parts: one is microscopic deformation and the other is macroscopic fluidization. The Vonoroï image algorithm is used to study the deformation on the bottom of the assemble cylinders by shearing force. The change of porosity before and after the deformation is analyzed at different velocities(i.e. 4.17cm/s, 12.34cm/s), slopes(i.e. 0°, 20°), and gap clearance(i.e. 0cm, 2.2cm). The deformable region increases as the belt velocity becomes faster. The porosity changes with different packing styles of cylinders, being large by loose arrangement, but small by compact arrangement. The regions of the large porosity deform and collapse easily. Different belt velocities (i.e. 4.17cm/s, 12.34cm/s) affect the thickness of fluidization, and lead to two opposite results on the decay rate of PVC layers under the same experimental conditions. The sequence of cylinders flowing out the confined zone is strongly related to the gap clearance. When the gap raises high, the leading side of cylinders will flow out first while the gap becomes low, the tailing side and bottom parts of cylinders will flow out first.
    Appears in Collections:[土木工程研究所] 博碩士論文

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