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研究生:Chandra Suciadi
研究生(外文):Chandra Suciadi
論文名稱:Analysis of Deep Excavation with Buttress Walls Using the Finite Element Method
論文名稱(外文):Analysis of Deep Excavation with Buttress Walls Using the Finite Element Method
指導教授:Professor Chang-Yu Ou
指導教授(外文):Professor Chang-Yu Ou
口試委員:Professor Chang-Yu Ou
口試日期:2012-07-30
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:營建工程系
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:英文
論文頁數:140
中文關鍵詞:Buttress wallsHardening soilDeep ExcavationThere-dimensional FE analysis
外文關鍵詞:Buttress wallsHardening soilDeep ExcavationThere-dimensional FE analysis
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This study aims to analyze the effect of buttress walls in deep excavation using 3D finite element method. Three scenarios of hardening soil (HS) model inputs parameters were selected in this study. The reasonable soil inputs of HS model from the scenarios were obtained by comparing computed and measured of wall deflection and ground settlement in UPIB excavation case, the well documented case study. This work also explores the effects of buttress walls in wall deflection and ground settlement by performing parametric studies based on previous study (TNEC case). Effects of excavation depth (He), excavation width (B), interval of buttress wall (Sb), and length of buttress wall (L¬b) on wall deflection and ground settlement were studied. Results of parametric studies indicate that the wall deflection and ground settlement forming a curve shape. This study introduced Deflection Reduction Ratio (DRR) and Settlement Reduction Ratio (SRR) to quantify the effects of buttress walls. DRR and SRR curve are observed with similar pattern each other in this study. It was also observed for 20m and 30m excavation cases, SRR shows slightly larger value than DRR. This study provides insightful information for buttress walls design in deep excavations
This study aims to analyze the effect of buttress walls in deep excavation using 3D finite element method. Three scenarios of hardening soil (HS) model inputs parameters were selected in this study. The reasonable soil inputs of HS model from the scenarios were obtained by comparing computed and measured of wall deflection and ground settlement in UPIB excavation case, the well documented case study. This work also explores the effects of buttress walls in wall deflection and ground settlement by performing parametric studies based on previous study (TNEC case). Effects of excavation depth (He), excavation width (B), interval of buttress wall (Sb), and length of buttress wall (L¬b) on wall deflection and ground settlement were studied. Results of parametric studies indicate that the wall deflection and ground settlement forming a curve shape. This study introduced Deflection Reduction Ratio (DRR) and Settlement Reduction Ratio (SRR) to quantify the effects of buttress walls. DRR and SRR curve are observed with similar pattern each other in this study. It was also observed for 20m and 30m excavation cases, SRR shows slightly larger value than DRR. This study provides insightful information for buttress walls design in deep excavations
Abstract I
Acknowledgements II
Table of Contents III
List of Tables V
List of Figures VI
CHAPTER 1 Introduction 1
1.1 Background 1
1.2 Objectives 1
1.3 Thesis Structure 2
CHAPTER 2 Literature Review 3
2.1 Buttress Wall in Deep Excavation 3
2.2 Overview of Hardening Soil Model 7
2.2.1 Hardening Soil Model Stiffness Method 1 9
2.2.2 Hardening Soil Model Stiffness Method 2 10
2.2.3 Hardening Soil Model Stiffness Method 3 11
CHAPTER 3 CASE STUDY OF EXCAVATION WITH CROSS WALLS AND BUTTRESS WALLS 13
3.1 Overview of UPIB case 13
3.2 Input Parameters and Simulation 14
3.3 Analysis Effect of Buttress Wall in Deep Excavation 17
3.3.1 Comparison Results for Method 1 and Method 2 18
3.3.2 Comparison Results for Method 1 and Method 3 19
3.3.3 Comparison Results for Method 3 with Different E_50^ref/E_oed^ref Ratio 19
3.4 Summary and Conclusion 20
CHAPTER 4 Parametric Study of Buttress Wall 21
4.1 Introduction 21
4.2 Input Parameters and Simulation 22
4.3 Effects of Excavation Geometry against Buttress Wall Effectiveness 22
4.3.1 Excavation Simulation cases using 4 and 6 Buttress Walls 22
4.3.2 The Comparison Analysis of Parametric Study Results 23
4.3.3 DRR Analysis Results In Parametric Study Case 26
4.3.4 SRR Analysis Results In Parametric Study Case 27
4.3.5 Comparison between DRR and SRR Analysis 29
4.4 Summary and Discussion 30
4.4.1 Summary 30
4.4.2 Discussion 31
CHAPTER 5 CONCLUSION AND FUTURE RESEARCH 32
5.1 Conclusion 32
5.2 Future Research 32
REFERENCES 33
PLAXIS 3D 2010 Manual
Ou, C. Y. (2006). “Deep Excavation: Theory and Practice”. Taylor & Francis, Netherlands
Lim, A., Ou, C. Y., Hsieh, P. G (2010). “Evaluation of clay constitutive models for analysis of deep excavation under drained condition.” Journal of Geo-Engineering, Vol. 5, No. 1, pp. 9-20
Ou, C. Y., Lin, Y. L., and Hsieh, P. G. (2006), “Case record of an excavation with cross walls and buttress walls,” Journal of GeoEngineering, Vol. 1, No. 2, pp. 79-86.
Ou, C. Y., Hsieh, P. G., and Lin, Y. L. (2011), “Performance of Excavations with Cross Walls,” Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 137, No. 1.
Ou, C. Y., Chiou, D. C. and Wu, T. S. (1996). “Three-dimensional finite element analysis of deep excavations.” Journal of Geotechnical Engineering, ASCE, 122(5), 337−345.
Ou, C. Y., Hsieh, P. G. and Chiou, D. C. (1993). “Characteristics of ground surface settlement during excavation.” Canadian Geotechnical Journal, 30, 758−767.
Chen, S. L., Ho, C. T., Li, C. D., and Gui, M. W (2011). “Efficiency of Buttress Walls in Deep Excavations.” Journal of GeoEngineering, vol. 6, No. 3, 145-146
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