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系統識別號 U0026-0408202013073300
論文名稱(中文) 歐拉-拉格朗日耦合技術量化分析擋流樁對顆粒材料破壞衝擊的影響
論文名稱(英文) Quantifying the Destructive Impact Reduction of Granular Material with Baffle Piles using CEL
校院名稱 成功大學
系所名稱(中) 土木工程學系
系所名稱(英) Department of Civil Engineering
學年度 108
學期 2
出版年 109
研究生(中文) 沈建宏
研究生(英文) Calvin Wijaya
學號 N66087143
學位類別 碩士
語文別 英文
論文頁數 56頁
口試委員 指導教授-洪瀞
口試委員-胡宣德
口試委員-吳建宏
中文關鍵字 None 
英文關鍵字 Baffle Piles  Debris Flow  Coupled Eulerian-Lagrangian Approach  Impact Reduction Rate 
學科別分類
中文摘要 None
英文摘要 Structural mitigation measures are often used to protect human lives and civil habitats by retaining the debris and resisting the impact along the potential flowing path. However, simplification such as having the same dimension for every structure, and increasing the number of structures are very common in engineering practice through the efficiency and effectiveness of such design have not yet been comprehensively investigated. This study presents a quantitative investigation on the effectiveness of baffle piles to mitigate the destructive impact of granular flows using the validated Coupled Eulerian-Lagrangian (CEL) finite element technique. The features of this study are the number of baffle piles, the height of the baffle piles, and the shape effect from baffle piles on the impact force reduction, deposition process of granular flows (flowing behaviours) and the energy dissipations. A comparative study on the impact reduction rate shows that baffle piles can effectively reduce the destructive impact of the granular material when applied to steeper slopes and can reduce the deposition time of granular material in lower inclination slopes. The results also show that increasing the number of baffle piles does not increase the reduction rate of kinematic granular flow impact and designing the baffle piles with circular shapes are more recommended due to its high versatility in various field conditions.
論文目次 TABLE OF CONTENTS


COVER i
PASSING CERTIFICATE ii
DECLARATION iii
ABSTRACT iv
ACKNOWLEDGEMENT v
TABLE OF CONTENTS vi
LIST OF TABLES viii
LIST OF FIGURES ix

CHAPTER I INTRODUCTION 1
1.1 Background 1
1.2 Research Methodology 4
1.3 Research Framework 5
CHAPTER II LITERATURE REVIEW 6
CHAPTER III FUNDAMENTAL THEORY 14
3.1 Eulerian-Lagrangian Formulation 14
3.1.1 Governing Equations 14
3.1.2 Time Integration Scheme 18
3.1.3 Contact Behaviour between Materials 19
3.2 Constitutive Model of Granular Materials 20
CHAPTER IV DESIGN OF NUMERICAL MODEL 26
4.1 Model Configuration 26
4.2 Granular Flows and Baffle Piles 27
CHAPTER V RESULTS AND DISCUSSION 36
5.1 Number of Baffle Piles 36
5.1.1 Impact Forces 36
5.1.2 Energy Dissipation 40
5.2 Height of Baffle Piles 42
5.2.1 Impact Forces 42
5.2.2 Deposition Process 46
5.3 The Shape of Baffle Piles 47
5.4 Effectiveness of Baffle Piles 48
CHAPTER VI CONCLUSION AND SUGGESTION 51
6.1 Conclusion 51
6.2 Suggestion 52

REFERENCES 53








LIST OF TABLES

Table 2.1 Comparison of Numerical Approach Studies on Granular Flows Behaviours 10
Table 2.2 Studies on Soil-Flow Behaviours using the Bingham Plastic Model 13
Table 4.1 (a) Numerical Models for CEL Simulation with Rectangular Baffle Piles 30
Table 4.1 (b) Numerical Models for CEL Simulation with Circular Baffle Piles 30
Table 4.2 Parameters of Granular Flow Impact Simulations 33
Table 4.3 Gravity Acceleration Component of Granular Flow Impact Test 33
Table 5.1 Reduction Rate of Baffle Piles 47
Table 5.1 Reduction Rate in Average 50











LIST OF FIGURES

Figure 1.1 Banjarnegara Landslide 2014 1
Figure 1.2 Deadly Landslide in Banaran Village, Ponorogo, East Java 2017 2
Figure 1.3 Research Flowchart 4
Figure 2.1 Effect of Friction Coefficient on Landslide Propagation 8
Figure 2.2 Laboratory Set-Up for Granular Flow Impact Test 8
Figure 2.3 Design of CEL Model 9
Figure 2.4 Results of the Impact Forces Simulated by the CEL Models 9
Figure 3.1 The solving procedure in the CEL formulation 15
Figure 3.2 Hugonoit Curve 21
Figure 3.3 Schematic of Shock Wave Transmission Process 23
Figure 3.4 Stress-Strain Relationship of Fluids 24
Figure 4.1 Schematic of CEL Flume Test Model with Baffle Piles 28
Figure 4.2 CEL Flume Test with Baffle Piles – Model 1 31
Figure 4.3 CEL Flume Test with Baffle Piles – Model 2 31
Figure 4.4 Baffle Piles Top View Layout for Model 1 & 2 34
Figure 4.5 Meshing Size of Eulerian Domain 35
Figure 4.6 CEL Model Boundary Condition Setting 35
Figure 5.1 Kinematic Granular Flow Impact Force Reduction with Rectangular Baffle Piles on 45 Degree CEL Flume Test 36
Figure 5.2 Kinematic Granular Flow Impact Force Reduction with Rectangular Baffle Piles on 55 Degree CEL Flume Test 36
Figure 5.3 Kinematic Granular Flow Impact Force Reduction with Rectangular Baffle Piles on 65 Degree CEL Flume Test 37
Figure 5.4 Kinematic Granular Flow Impact Force Reduction with Circular Baffle Piles on 45 Degree CEL Flume Test 38
Figure 5.5 Kinematic Granular Flow Impact Force Reduction with Circular Baffle Piles on 55 Degree CEL Flume Test 38
Figure 5.6 Kinematic Granular Flow Impact Force Reduction with Circular Baffle Piles on 65 Degree CEL Flume Test 39
Figure 5.7 Energy Dissipation of the CEL Models with Slope Angle of 45 Degree 40
Figure 5.8 Energy Dissipation of the CEL Models with Slope Angle of 65 Degree 41
Figure 5.9 Kinematic Granular Flow Impact Force Reduction with Different Height Rectangular Baffle Piles on 45 Degree CEL Flume Test 42
Figure 5.10 Kinematic Granular Flow Impact Force Reduction with Different Height Rectangular Baffle Piles on 55 Degree CEL Flume Test 43
Figure 5.11 Kinematic Granular Flow Impact Force Reduction with Different Height Rectangular Baffle Piles on 65 Degree CEL Flume Test 43
Figure 5.12 Kinematic Granular Flow Impact Force Reduction with Rectangular Baffle Piles on 65 Degree CEL Flume Test 44
Figure 5.13 Kinematic Granular Flow Impact Force Reduction with Different Height Circular Baffle Piles on 55 Degree CEL Flume Test 44
Figure 5.14 Kinematic Granular Flow Impact Force Reduction with Different Height Circular Baffle Piles on 65 Degree CEL Flume Test 45
Figure 5.15 Deposition Process of Granular Material from Model R65-1 and R65-2 46
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