利用三維顆粒顯像儀分析水與土運動之研究(3/3)
Date Issued
2004
Date
2004
Author(s)
DOI
922211E002058
Abstract
本研究旨在發展一套實驗室之試驗設備，以探討土石流及因地震引發之崩塌滑動。這些現象存在於台灣本島地區，因台灣地勢處於陡坡又強烈雨型與地震頻繁之地理位置。這些現象有一些極重要的力學機制，即在飽和顆粒力學，如何由固態過渡成為液態。由於因為實驗儀器及設備的普遍不足，使得在物理觀念的瞭解及數值模擬的進行，受到極大的阻礙。
本研究即針對上述的研究動機提出下列的研究方法：（1）設計及建造一套土石流循環水槽;（2）建立反射因子映象，以探討土石流內部水與沙顆粒之間的變形及混和;（3）建立三維數值顆粒顯像流速儀，以測量水與土沙顆粒之運動狀態。透過這些實驗設備及數據的量取，將有助於土石流及土石滑動之微力學之物理機制及土石流基本流場之瞭解。
我們將應用這套系統（此系統將安置於台大水工所新設置之現代流體力學實驗室內），來研究下列三大重要主題：（1）因地震引發之邊坡破壞及土石流;（2）土石流之基本物理機制：（3）土壤液化與土石流之不穩定之現象。吾人相信這套最新的設備，將可以達到上述三項目標。同時，透過高解析度的量測系統，將可量到土石流顆粒之間的內部變形，並能將這些量得之實驗數據，用作理論及數值計算之回饋，也可以將這些數據提供給其他同好研究工作者做其他研究之用。相信透過本研究計畫，吾人對台灣地區土石流發生之原因及防治對策，將可更上一層樓。
Subjects
The present report documents a three-year research project aimed at developing novel
experimental methods for the laboratory study of debris flows and flowslides.
Transparent access to the micromechanics of liquid-granular flows is sought through
a combination of three components: 1) liquid and granular media with special optical
properties allowing unhindered 3D imaging
experimental methods for the laboratory study of debris flows and flowslides.
Transparent access to the micromechanics of liquid-granular flows is sought through
a combination of three components: 1) liquid and granular media with special optical
properties allowing unhindered 3D imaging
2) a tilting flume equipped with two
recirculation circuits for the liquid and granular phases
recirculation circuits for the liquid and granular phases
3) digital imaging algorithms
allowing acquisition and analysis of the 3D particle flow field inside the bulk. Key
results from the project include:1) the successful preparation of transparent
liquid-granular mixtures with small visible cores at the centre of the granular particles
allowing acquisition and analysis of the 3D particle flow field inside the bulk. Key
results from the project include:1) the successful preparation of transparent
liquid-granular mixtures with small visible cores at the centre of the granular particles
achieved using Refractive Index Matching (RIM) and laser marking
2) the
demonstration that stereo imaging techniques can reliably track the 3D positions and
motions of large sets of such marked particles
demonstration that stereo imaging techniques can reliably track the 3D positions and
motions of large sets of such marked particles
using high-resolution video and
Particle Tracking Velocimetry (PTV) algorithms
Particle Tracking Velocimetry (PTV) algorithms
3) the design
implementation and
testing of a novel double recirculation flume in which rapid downslope surges of
granular-liquid mixtures can be made stationary and characterised in detail.
testing of a novel double recirculation flume in which rapid downslope surges of
granular-liquid mixtures can be made stationary and characterised in detail.
Publisher
臺北市：國立臺灣大學水工試驗所
Type
report
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