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姓名 張欽舜(CHIN-SHUN CHANG)  查詢紙本館藏   畢業系所 土木工程學系
論文名稱 顆粒流對垂直平板撞擊力之數值模擬
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摘要(中) 撞擊力為土石流運動破壞結構物的重要因素之一。本研究在窄渠道內進行顆粒流崩塌模擬,並分析其流動物理特性及堆積機制,為了解顆粒流內部力量傳遞到板子上過程,使用PFC-3D程式進行數值模擬;數值模擬部分則以聚苯乙烯顆粒為模擬,並在底部黏上粗糙層顆粒,而堆積塊體高寬比a( )=1.4、顆粒填充高度Hf度作為主要對比參數,首先以模擬單顆粒試驗方式輸入參數的正確性,進而以撞擊力及塊體堆積等方式探討撞擊力對側板之影響。
本研究在PFC-3D數值模擬部分主要觀察其撞擊力、內部接觸力、不平衡力、動能、摩擦損耗之變化,其分析是以堆積高度、撞擊力變化、堆積型態為主。撞擊力變化在板距20cm情形最大撞擊力為0.7N、側板距30cm最大撞擊力為0.2N。
摘要(英) In this study, the impact forces acting on vertical walls by collapsing granular piles. DEM is explored by employing simulation PFC-3D. In the PFC-3D simulation, the observed impact force, inside contact force, unbalanced force, kinetic energy, friction energy loss are examined with different granular pile heights and wall location. The effect of stacking types and deposition are studied impact forces. In the PFC-3D numerical simulation found in the overall physical flow behavior is similar. The maximum impact force is 0.7N dependent on the
wall location.
關鍵字(中) ★ 顆粒流
★ 崩塌
★ 離散元素法
★ 撞擊力
關鍵字(英) ★ Granular flows
★ Collapse
★ DEM
★ impact force
★ PFC-3D
論文目次 第一章緒論 ........................................................................................................... 1
1.1 前言 .......................................................................................................... 1
1.2 研究目的 .................................................................................................. 2
1.3 研究方法 ................................................................................................. 3
1.4 研究架構 .................................................................................................. 3
第二章文獻回顧 ................................................................................................... 5
2.1 顆粒運動路徑 .......................................................................................... 5
2.2 濕顆粒崩塌實驗 ...................................................................................... 7
2.3 不同濃度下之崩塌模擬 .......................................................................... 8
2.4 數值模擬崩塌 .......................................................................................... 9
第三章 模擬配置與方法 ................................................................................... 14
3.1 模擬配置 ................................................................................................ 14
3.1.1 模擬渠槽 ...................................................................................... 14
3.1.1 不同落距濃度變化 ...................................................................... 14
3.2 顆粒材質介紹 ........................................................................................ 16
3.2.1 顆粒粒徑 ...................................................................................... 17
3.2.2 楊氏係數 Ε 與柏松比 ν ............................................................... 17
3.2.3 摩擦係數 μ ................................................................................... 18
3.2.4 回復係數 e ................................................................................... 19
3.3 PFC-3D(Particle Flow Code in three Dimensions) ................................ 20
3.3.1 顆粒運動定律 .............................................................................. 21
3.3.2 顆粒接觸力模型 .......................................................................... 22
3.4 分析步驟與方法 ................................................................................... 23
3.4.1 堆積高度 ...................................................................................... 26
第四章 模擬結果與討論 ................................................................................... 28 v

4.1 不同堆積條件下崩落歷程與變化 ........................................................ 28
4.1.1 不同落距條件下瞬時接觸力變化 .............................................. 31
4.2 PFC-3D 數值模擬 .................................................................................. 32
4.2.1 顆粒流平均接觸力 ...................................................................... 37
4.2.2 顆粒流平均不平衡力 .................................................................. 39
4.2.3 顆粒流動能 .................................................................................. 39
4.2.4 顆粒流摩擦耗能 .......................................................................... 40
4.2.5 顆粒撞擊力 ................................................................................. 41
4.2.6 顆粒不平衡力與撞擊力關係 ..................................................... 43
4.2.7 顆粒接觸力與撞擊力關係 ......................................................... 45
第五章 模擬結果與討論 ................................................................................... 47
5.1 結論 ........................................................................................................ 47
5.2 建議 ........................................................................................................ 47
參考文獻 48
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指導教授 周憲德(Hsien-Ter Chou) 審核日期 2014-7-29
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