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研究生： 鄧志強
Fernando Rochili
論文名稱： Reduction Ratio of Wall Displacement with Consideration of System Stiffness:
 Numerical Simulations & Verifications
Reduction Ratio of Wall Displacement with Consideration of System Stiffness: 
Numerical Simulations & Verifications
指導教授： 鄧福宸
Fu-Chen Teng
口試委員: 謝百鈎
Pio-Go Hsieh
熊彬成
Bin-Chen Hsiung
學位類別： 碩士
Master
系所名稱： 工程學院 - 營建工程系
Department of Civil and Construction Engineering
論文出版年： 2023
畢業學年度： 112
語文別： 英文
論文頁數： 151
中文關鍵詞： 深開挖工程 、PLAXIS 、連續壁變形 、輔助工法 、System Stiffness
外文關鍵詞： Deep Excavation, PLAXIS, Wall Displacement, Auxiliary Method, System Stiffness
相關次數： 點閱：76  下載：0 
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    • In this modern era, there are a lot of method to evaluate excavation-induced wall displacement, including empirical formula, numerical analysis, etc. In case of larger scale and extensive excavation, auxiliary method such as cross wall and buttress wall are frequently employed to reduce the wall deformation and surface settlement. While 3D finite element analysis offers a comprehensive approach to simulate excavation scenarios with auxiliary methods, its complexity and time-intensive nature are some challenges. Alternatively, 1D simulation offers quicker and simpler approach, but it involves highly empirical parameter input. Also, recent study utilized big data for wall deformation prediction encounter limitations due to the separation of data sets into groups with and without auxiliary methods.

    To address the effect of auxiliary method, a system stiffness term will be utilized to propose a reduction ratio. This methodology enables the prediction of excavation-induced deformation when employing cross wall or buttress wall, utilizing solely the deformation outcome 1D or 2D simulation without any auxiliary method. The equation of this method was derived from sets of parametric study varying cross wall parameters using PLAXIS 3D with HSsmall soil model. Based on the results, a relationship of wall deformation and system stiffness was established.

    The obtained reduction ratio relationship was validated with 4 past cases, including well-recorded UPIB Building case and 3 residential building cases. The research findings indicate that the reduction ratio can depicts a recognizable relationship between wall deformation ratio and system stiffness, with a maximum wall deformation reduction of 60%. The result of the verification cases also indicate that the method can be applied to the previous study of wall prediction using big data. Furthermore, an example case was demonstrated to show the usage of the reduction ratio in designing cross wall or buttress wall with 1D or 2D simulation result without auxiliary methods.

    ABSTRACT i ACKNOWLEDGEMENT ii TABLE OF CONTENTS iii LIST OF FIGURES vi LIST OF TABLES xi CHAPTER 1 INTRODUCTION 1 1.1 Background 1 1.2  Research Objective 2 1.3  Thesis Structure 2 CHAPTER 2 LITERATURE REVIEW 4 2.1  Introduction 4 2.2  Excavation-Induced Retaining Wall Displacement 4 2.3  Cross Wall and Buttress Wall 7 2.3.1  Cross Wall 7 
 2.3.2  Buttress Wall 10 2.4  Total System Stiffness of Retaining Structures 12 2.5  Excavation Database 15 CHAPTER 3 VALIDATION OF NUMERICAL SIMULATION MODEL OF A DEEP EXCAVATION CASE 17 3.1  Introduction 17 3.2  Hardening Soil Model with Small Strain Stiffness Model (HSsmall) 17 
 3.3  UPIB Building Case Introduction 21 3.3.1  Case Introduction 21 
 3.3.2  Soil Profile 22 3.3.3  Retaining Structures 24 3.4 Simulation Configuration 25 3.4.1  Soil Parameters 25 3.4.2  Structure Parameters 29 3.4.3  Construction Sequence 29 3.4.4  Model Boundary 31 3.5 Simulation Result and Comparison 33 CHAPTER 4 PARAMETRIC STUDY OF CROSS WALL PARAMETERS 39 4.1  Introduction 39 4.2  Parametric Study 39 4.2.1  Cross Wall Parameters 39 
4.2.2  Parametric Study Model 40 
 4.2.3  1st Parametric Study 40 
 4.2.4  2nd Parametric Study 45 
 4.2.5  3rd Parametric Study 49 
 4.3  Final Regression Equation 53 
 4.4  Buttress Wall Ratio 56 CHAPTER 5 VERIFICATION WITH CASE HISTORIES AND DISCUSSION 60 5.1  Introduction 60 5.2  1st Verification Case: UPIB Building Case 60 5.2.1  Analysis in Plane Strain Condition 61 
 5.2.2  Wall Deformation Prediction Using the Reduction Ratio 63 5.3 2nd Verification Case: Case A Residential Building 69 5.3.1  Excavation Case Introduction 69 5.3.2  Basic Soil Properties 70 
 5.3.3  Retaining Structures 71 
 5.3.4  Three Dimensional Analysis 72 5.3.5  Analysis in Plane Strain Condition 81 5.3.6  Wall Deformation Prediction Using the Reduction Ratio 83 5.4 3rd Verification Case: Case B Residential Building 87 5.4.1  Excavation Case Introduction 87 5.4.2  Basic Soil Properties 87 
 5.4.3  Retaining Structures 88 
 5.4.4  Three Dimensional Analysis 89 
5.4.5  Analysis in Plane Strain Condition 97 
5.4.6  Wall Deformation Prediction Using the Reduction Ratio 98 5.5 4th Verification Case: Case C Residential Building 102 5.5.1  Excavation Case Introduction 102 
 5.5.2  Basic Soil Properties 102 
 5.5.3  Retaining Structures 103 
 5.5.4  Three Dimensional Analysis 104 
 5.5.5  Analysis in Plane Strain Condition 114 
 5.5.6  Wall Deformation Prediction Using the Reduction Ratio 116 
 5.6  Discussion 119 
 5.7  Demonstration of Case Design 125 CHAPTER 6 CONCLUSIONS AND SUGGESTIONS 130 6.1  Conclusions 130 
 6.2  Suggestions For Future Works 131 REFERENCES 132 APPENDIX A 135

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