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系統識別號 U0026-0308202011153500
論文名稱(中文) 利用PFC3D探討基於5M與20M數值地形模型之崩塌地形三維數值模型
論文名稱(英文) Investigation on Three-Dimensional Numerical Modeling of Landslide based on 5M and 20M Resolution of Digital Elevation Model using PFC3D
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) 古沙塔
研究生(英文) Febi Satria Gumanta
學號 N66087101
學位類別 碩士
語文別 英文
論文頁數 58頁
口試委員 指導教授-洪瀞
口試委員-吳建宏
口試委員-胡宣德
中文關鍵字 none 
英文關鍵字 numerical landslide  digital elevation model  discrete element method  particle flow code  deposition process  velocity 
學科別分類
中文摘要 none
英文摘要 The complex establishing process of numerical model of landslide under three-dimensional condition using discrete element analysis (DEA) was presented. Particle flow code (PFC3D) based on DEA was utilized to explore the numerical landslide models which derived from two different resolutions of digital elevation model (DEM) from real topographical map located in Taiwan. Possible scenario of post-failure of kinematic runout behavior and deposition process of the landslide, considering influenced parameters (i.e. ball friction coefficient and wall friction coefficient, respectively) were also investigated. The constitutive model used was linear parallel bond contact model in which the uniaxial compression test was carried out as the calibration approach to obtain the micro-properties in PFC3D. The construction of landslide model requires two main components, the slip surface (modelled by wall elements) and sliding mass (modelled by ball elements), respectively. Two different DEM resolutions of 5 meters (finer) and 20 meters (coarser) were then carried out to simulate the slip surface. The wall elements of the slip surface generated from finer DEM model were approximately 16 times greater than those in the coarser DEM model. The BFM (brick filling method) logic was also utilized to estimate the capacity of sliding mass. The progressive process of landslide movement showed different behavior during deposition process with the same set real-time for both finer and coarser models. As the results, landslide model with coarser DEM could faster fit the deposition area within 468 seconds than using finer DEM model. A good agreement was shown by smaller wall and ball friction in which this circumstance show that decreasing the wall and ball friction coefficient would result the sliding mass to easily slide down along the slip surface and resulted particles to reach farer position of deposition area. In conclusion, the comprehensive analysis and results suggest that considering finer resolution of DEM model might be conducted in terms of more distributed area required, more realistic and fit the deposition area better compared to real post-event investigation but require longer of computational time. Coarser resolution of DEM model might perform kinematic energy less, less of computational time. However, the selection of which DEM resolution was probably dependent on the how large the investigated area was, considering the affected area, etc. The study demonstrates that a difference of 5M and 20M DEM resolution can be used to investigate the different behavior on kinematic runout and deposition process of the numerical model of landslide together with the influenced parameters also lead to satisfactory agreement with the related studies.
論文目次 TABLE OF CONTENTS
ABSTRACT I
DEDICATION II
ACKNOWLEDGEMENTS III
TABLE OF CONTENTS IV
LIST OF TABLES VI
LIST OF FIGURES VII
1 CHAPTER ONE INTRODUCTION 1
1.1 Background and Motivation. 1
1.2 Method and Procedure. 4
1.3 Research Framework. 5
2 CHAPTER TWO LITERATURE REVIEW 6
2.1 Prior Studies of Landslide Simulation. 6
2.2 Digital Elevation Model of Topographic Map 8
2.3 Overview of DEA Calibration Approaches. 10
2.4 Numerical Parameters Used in PFC3D. 11
3 CHAPTER THREE RESEARCH METHODOLOGY 14
3.1 Calibration of Numerical Uniaxial Compression Test. 14
3.2 Discrete Element Analysis. 17
3.2.1 Particle Flow Code (PFC) Software. 18
3.2.2 Boundary Conditions in PFC3D. 20
3.2.3 Constitutive Contact Model. 22
3.2.4 Linear Parallel Bond Contact Model. 24
3.3 Construction of Numerical Model. 27
3.3.1 Slip Surface Data Analysis. 29
3.3.2 Sliding Mass Data Analysis. 30
4 CHAPTER FOUR RESULT AND DISCUSSION 33
4.1 The Result of Discrete Element Analysis Model. 33
4.1.1 Progressive Failure Process of 20M DEM Landslide. 34
4.1.2 Progressive Failure Process of 5M DEM Landslide. 35
4.2 Comparison between 5M and 20M DEM of Landslide simulation. 37
4.3 The Effect of Wall and Ball Friction Coefficient. 41
4.4 The Relationship between Velocity Response and Time. 46
5 CHAPTER FIVE CONCLUSION AND SUGGESTION 49
5.1 Conclusion. 49
5.2 Suggestion. 51
REFERENCES 52
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