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研究生：	吳玲玲 Wu, Ling-Ling
論文名稱：	地工合成材料應用於鐵路穩定的設計與績效分析 Design and Performance Analysis of Geosynthetic Applications in Railroad Track Mitigation
指導教授：	陳景文 Chen, Jin-Wen
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：	2003
畢業學年度：	91
語文別：	英文
論文頁數：	132
中文關鍵詞：	Tensar-Pave 軟體、沈陷、FLAC 程式、實驗段鋪設、鐵路、加勁、地工織物與地工格綱合成材料
外文關鍵詞：	Tensar-Pave, Geotextile-Geogrid Composite, Reinforcement, Rail-road track, Testing installation, Stress-strain distribution, FLAC, Settlement
相關次數：	點閱：142 下載：5
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本研究的目的，針對地工合成材料在軌道工程上的應用，探討鐵道穩定的設計與績效分析。在道床設計中加入工地合成材料，可以增加道床的承載能力、隔離黏土層與級配層、防止上方級配層侵入下方細料層、幫助排水與降低激發孔隙水壓，改善因軌道長時間使用與超載所造成的道床湧泥現象。
配合中國鋼公司廠內魚雷車實際運行所造成道床湧泥現象，利用地工合成材料的鋪設，以FLAC與Tensar-Pave程式進行數值分析，並與沈陷板、水準儀的量測結果做一比較，籍以提供軌道道床在實際應用上的穩定分析。
本研究首先將利用FLAC 數值模式去模擬現場鐵路狀況，然後配合Tensar-Pave軟體作為輔助分析。透過此研究的成果，我們可以驗證地工合成材料可以有效的減緩軌道道床的沈陷，其減少量約為一般的30%左右；其加勁功能可有效地減少級配料20-40%的使用量；延長軌道床使用年限、節省人力、物力、降低維修頻率與提高經濟效益。

This research project was an effort to improve our understanding of the design and performance analysis of geosynthetics application in railroad track mitigation. Insert of geosynthetic layer at the subgrade and subbase interface, increase the bearing capacity of the track, separate the aggregate base course and the subgrade to prevent two dissimilar material from intermixing, and acts as a filter to prevent stone aggregate intrude into the fine soil or fine soils migrating up into voids of stone aggregate due to high pore water pressure induced by cyclic loading.
This research project was collaboration with China Steel Company , in order to mitigation railway ballast and aggregate degrade and deterioate progressively under cyclic loading by using geosynthetics reinforcement. The railroad track deformation and economic benefit were analyzed using numerical technique, FLAC program and Tensar-Pave software. FLAC (Fast Lagrangian Analysis of Continua) was selected for this research because of its excellent capability of modeling geotechnical engineering related stability problems and its extended programming ability.
First, FLAC model and Tensar-Pave software were used to simulate the field instrumentation measurments in real railroad track situation and then comparing with field measuring data (from settlement plates), in purpose to provide the mitigation of geosynthetic railroad track.
Results shown that the geosynthetics reinforced test section of the railroad track produced lower settlement about 30 % off compare to the unreinforcd test section and because of geosynthetics reinforcement function saving the amount of aggregate/ballast thickness about 20-40 %. Thereby, design cooperated with numerical techniques (FLAC) and Tensar-Pave software, would improved techniques for analyzing the track deformation, economic benefits (aggregate saving) and reduce the railraod track maintenance cost.

Abstract(after in chinese) .................................................................................. I
Abstract ............................................................................................................ II
Acknowledgements .........................................................................................IV
Table of content ................................................................................................V
List of figure....................................................................................................IX
List of table.................................................................................................... XII
List of symbol...............................................................................................XIII
Chapter 1 Introduction ......................................................................................1
1.1.Research Overview.......................................................................................... 3
1.2.Research Contents and Research Flow Chart.................................................. 4
1.3.Thesis Organization......................................................................................... 8
Chapter 2 Summaries of Fundamental Theories and Literature Review........10
2.1.An Overview of Geosynthetics ..................................................................... 10
2.1.1.Overview of Geotextiles..................................................................... 11
2.1.2.Geogrid Properties And Strength Considerations .............................. 13
2.2.Pavement Reinforcement Mechanism........................................................... 14
2.2.1.Base Reinforcement............................................................................ 14
2.2.2.Subgrade Restraint.............................................................................. 19
2.3.Geosynthetics In Railroad Track ................................................................... 22
2.3.1.Functions of Geosynthetics in railroad tracks .................................... 22
2.3.2.Subgrade Condition in which Geosynthetics are useful..................... 25
2.3.3.Potential Geosynthetics Benefits........................................................ 28
Chapter 3 Test Section Installation and Measuring ........................................31
3.1.Design Criteria For Unpaved Roads.............................................................. 31
3.1.1.Permeability/Permittivity Criteria ...................................................... 35
3.1.2.Retention Criteria ............................................................................... 39
3.1.3.Clogging Resistance Criteria.............................................................. 43
3.1.4.Survivability and Endurance Criteria ................................................. 46
3.1.5 Tensile Criteria ................................................................................... 47
3.2.Geosynthetics Specifications......................................................................... 48
3.2.1.Specification Guide for Geotextiles Used in Separation and Filter
Applications................................................................................................. 49
3.2.2.Testing installation procedures ........................................................... 51
3.3.Field Testing and Measuring ......................................................................... 66
Chapter 4 Simulate Field Condition by Numerical Techniques (FLAC) and
Tensar Pave Software ......................................................................................69
4.1.Numerical Model Development .................................................................... 69
4.1.1.General Description of FLAC ............................................................ 70
4.1.2.Built-in Material Models .................................................................... 72
4.1.3.Determination of Reinforcement Input Properties ............................. 76
4.1.4.Model.................................................................................................. 77
4.2.Cooperation with Different Design Software................................................ 78
4.3.Numerical Modeling Result .......................................................................... 86
4.3.1.Unreinforced Railroad Track.............................................................. 86
4.3.2.Reinforced Railroad Track ................................................................. 89
4.4.Summary........................................................................................................ 94
Chapter 5 Conclusion and Recommendations for Future Researches..........103
5.1.Conclusions ................................................................................................. 103
5.2.Future Researches........................................................................................ 104
References .....................................................................................................106
Appendix I Settlement Data from the Field ..................................................112
Appendix II Test Section Investigation.........................................................120
                                    

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