砂質土壤中柔性擋土牆在動態載重下的行為

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姓名

阮天恩(Thien-An Nguyen) 查詢紙本館藏

畢業系所

土木工程學系

論文名稱

砂質土壤中柔性擋土牆在動態載重下的行為
(The Behavior of Flexible Retaining Wall Backfilled by Cohesionless Soil Subjected to Dynamic Loading)

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摘要(中)

鋼板樁結構廣泛的運用在擋土開挖及近水公路的擋土支撐結構上。然而此類結構物於地震作用力下十分脆弱，特別是在飽和土壤的條件下。近來有許多大地工程的案例透過有線元素法模擬分析，皆得到許多成功的模擬結果，本研究目的為透過離心模型試驗結果，建立有限元素法基礎模型。
本研究首先透過地工離心機試驗分別於乾砂地盤及飽和地盤(飽和液面為下層表面)進行單排鋼板樁及雙排鋼板樁震動試驗。透過試驗結果取得系統性質並透過GeoStudio 分析軟體建立有限元素模型。
試驗結果顯示FEM模型能有效地預測鋼板樁的側向變位及最大彎矩值，但在土壤沉陷的計算上沒有良好的準確度。試驗結果顯示，鋼板樁最大彎矩值在振動試驗中高於初始穩定狀態30 %且沉陷最大處發生於樁後0.25倍樁高位置，此結果與Ou(1993)中說明開挖產生沉陷位置不同。除此之外，雙排鋼板樁試驗中呈現較小的側向變位及沉陷，由於雙排鋼板樁前後排互制下具有較高的勁度。根據本研究結果，FEM模型模擬結果考量恰當的安全係數下可以模擬離心模型試驗中鋼板樁的側向變位與彎矩值，但沉陷分析建議採用其他分析方法以取得較準確的結果。

摘要(英)

Sheet pile structure system has been widely employed for excavation, water-front structure highway, etc. as the retaining structure. However, this kind of structure is vulnerable to seismic loading especially in the saturated ground condition. In addition, the Finite Element Method (FEM) recently success in simulating many problem of geotechnical engineering, this work try to produce a benchmark of computing result base on centrifuge modeling data.
In this research, a series of test were adopted simulate the single and double wall sheetpile structure in dry and saturated (water level up to dredge line) sandy ground. The system proper-ties measured during flying the model were collected to construct a numerical model via com-mercial Finite Element Method (FEM) software GeoStudio.
The result shows that the FEM model success in estimate lateral displacement and the maxima appearance moment, meanwhile the computed settlement did not reach a high accuracy. Base on the experiment data, the maxima moment in studied seismic event is 30 percent higher than which measured at static state. The maxima settlement is located at distance equal to 0.25 of wall height that is differ from the maxima settlement due to excavation that introduced by Ou (1993). Moreover, the double wall system exhibited a smaller lateral displacement and settlement due to their higher stiffness which thank to the interaction between the front and rear sheetpile. According to this research, it may relevant to estimate the lateral displacement and moment in mentioned structure by FEM software with a suitable factor of safety, the settlement should be estimate by another method for a precise value.

關鍵字(中)

★ 柔性擋土牆
★ 動態載重
★ 離心模擬試驗
★ FEM

關鍵字(英)

★ Sheetpile
★ Dynamic loading
★ Centrifuge modeling
★ FEM

論文目次

ABSTRACT i
ACKNOWLEDGEMENT iii
TABLE OF CONTENT v
LIST OF FIGURES viii
LIST OF TABLES xiii
1. INTRODUCTION 1
1.1. Introduction 1
1.2. Scope of work 1
2. LITURATURE REVIEW 3
2.1. Literature review 3
2.2. Static condition 3
2.2.1. Static horizontal earth pressure 3
2.3. Earth pressure in dynamic loading 5
2.3.1. Mononobe-Okabe method 5
2.3.2. Seed and Whitman method 6
2.3.3. Mylonakis method 7
2.3.4. Experimental Studies 8
2.3.5. Numerical studies 11
2.3.6. Observed Field Performance of Retaining Walls during Earthquakes 14
3. CENTRIFUGE MODELING: PRINCIPLE AND TESTING EQUIPMENT 16
3.1. Centrifuge modeling principle 16
3.1.1. Scaling law 17
3.1.2. Limitation of centrifuge physical modeling 18
3.2. NCU Geotechnical Centrifuge 18
3.2.1. Servo-hydraulic shaking table 19
3.2.2. High frequency electronic transducers 19
4. SHEET PILE MODEL EXPERIMENT SCHEDULE 27
4.1. Preparation of model 27
4.1.1. Shaking event 34
4.1.2. Surface scanning 35
5. RESULTS AND DISSCUSIONS 37
5.1. Acceleration response 38
5.1.1. Amplitude amplification 38
5.1.2. Predominant frequency 44
5.2. Lateral displacement 50
5.3. Moment along the sheet pile 53
5.4. Surface deformation 60
6. NUMERICAL SIMULATION 67
6.1. Model building 67
6.1.1. Geometry 67
6.1.2. Material 67
6.1.3. Boundary condition 72
6.2. Simulation result 76
6.2.1. Lateral displacement 76
6.2.2. Moment 78
6.2.3. Settlement 83
7. CONCLUSION 85
7.1. Conclusion 85
7.2. Future work 86
APPENDIX A – SETTLEMENT DATA 87
APPENDIX B – EXPERIMENT DATA 101
REFERENCES 113

參考文獻

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指導教授

洪汶宜(Wen-Yi Hung)

審核日期

2017-7-31

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