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研究生：	沈建宏 Wijaya, Calvin
論文名稱：	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 Quantifying the Destructive Impact Reduction of Granular Material with Baffle Piles using CEL
指導教授：	洪瀞 Ching, Hung,
學位類別：	碩士 Master
系所名稱：	工學院 - 土木工程學系 Department of Civil Engineering
論文出版年：	2020
畢業學年度：	108
語文別：	英文
論文頁數：	56
外文關鍵詞：	Baffle Piles, Debris Flow, Coupled Eulerian-Lagrangian Approach, Impact Reduction Rate
相關次數：	點閱：141 下載：3
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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.

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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校內：2022-08-01公開
校外：2022-08-01公開

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