Mitigation of Ground Vibration Induced by High-speed Trains Using a Periodic Pile System
- Alternative Title
- 반복적 파일 시스템을 이용한 고속열차 유발 지반진동의 저감
- Abstract
- This study evaluates the ground vibration reduction performance of piles inserted into the ground by applying the dynamic theory of periodic structures. A three-dimensional finite element model of the target system is used to calculate dispersion curves for incident waves of various angles of incidence and wave numbers, and bandgap is identified therefrom. In addition, the ability to reduce vibration caused by harmonic loads is investigated through parametric analysis. By applying the target pile system, the ability to reduce ground vibration induced by high-speed trains is identified. To this end, a three-dimensional train-track-ground linkage model is created by combining the multi-body dynamics model of the vehicle and the finite element model of the track and the ground. The developed model is used to evaluate the ground vibration reduction ability of the target pile system, and it can be confirmed that the dynamic response such as vertical displacement, velocity and acceleration of the ground caused by the dynamic train load is significantly reduced. The optimized pile system parameters can be derived through parametric analysis.
- Issued Date
- 2022
- Awarded Date
- 2022. 2
- Type
- Dissertation
- Publisher
- 부경대학교
- Alternative Author(s)
- 응웬 마우 낫 안
- Affiliation
- Pukyong National University, graduate School
- Department
- 대학원 해양공학과
- Advisor
- LeeJinHo
- Table Of Contents
- CHAPTER 1: INTRODUCTION 1
1. Background 1
2. Regulation for the ground vibration caused by high-speed trains 5
3. Objective and Scope 13
4. Organization of the Thesis 13
CHAPTER 2: THEORETICAL FORMULATION OF METAMATERIALS AND ITS APPLICATION TO A PERIODIC PILE SYSTEM 14
1. Wave equation and Floquet-Bloch theory 14
2. Model validation 17
3. Screening effect of pile barriers subjected to harmonic force 21
3.1 Distance of the pile from the source of excitation 23
3.2 Length of the pile 24
3.3 Diameter of the pile 26
3.4 Separation of the piles 27
CHAPTER 3: HIGH-SPEED TRAIN AND REDUCTION SYSTEM NUMERICAL MODEL 28
1. High-speed train modelling 28
2. Track modelling 29
3. Embankment, soil and pile modelling 31
4. Absorbing boundary solutions 33
5. Software implementation 33
6. Ground vibration analysis 34
CHAPTER 4: PARAMETRIC STUDY 38
1. Length of the pile 38
1.1 Point beyond the piles 38
1.2 Point between the piles 40
1.3 Standard assessment 42
2. Distance of the pile system from the rail 43
3. Number of pile rows 45
4. Separation between piles 49
CHAPTER 5: CONCLUDING REMARKS 55
APPENDIX A: PILE SYSTEM SUBJECTED TO HARMONIC FORCE 57
1. Distance of the pile to the source of excitation 57
2. Length of the pile 62
3. Diameter of the pile 67
4. Separation of the piles 72
APPENDIX B: PILE SYSTEM SUBJECTED TO GROUND WAVE CAUSED BY MOVING HIGH-SPEED TRAINS 77
1. Number of pile rows 79
1.1. Remaining the number of piles 79
1.2. Increasing the number of piles 80
2. Distance of the pile system from the rail 78
3. Length of the pile 77
4. Separation between piles 79
4.1. Ratio s/d = 0.5 81
4.2. Ratio s/d = 1 82
4.3. Ratio s/d = 2 83
4.4. Ratio s/d = 4 84
REFERENCES 85
ACKNOWLEDGEMENTS 89
- Degree
- Master
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