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研究生: 湯傑瑞
Jerry - Franky Tonio Panggabean
論文名稱: The Influence of Rainfall on the In-Situ Backfill Soil of Mechanically Stabilized Earth Wall
The Influence of Rainfall on the In-Situ Backfill Soil of Mechanically Stabilized Earth Wall
指導教授: 李咸亨
Hsien-Heng Lee
口試委員: 陳樹群
none
杜昀
none
卿建業
none
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: 2007
畢業學年度: 95
語文別: 英文
論文頁數: 291
中文關鍵詞: MSEWFLACRainfallWall face displacementPressureconstruction sequence
外文關鍵詞: MSEW, FLAC, Rainfall, Wall face displacement, Pressure, construction sequence
相關次數: 點閱:190下載:14
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The investigation of the rainfall as one of the many factors that effects the behavior of four in situ Mechanically Stabilized Earth Wall (MSEW), namely S-Wall, F-Wall, SI-Wall and FI Wall, is presented in this thesis. This investigation is carried out by performing the simulation of the in situ MSE walls. A finite difference based program, named FLAC is utilized for this purpose.
FLAC uses strain softening model to simulate the soil behavior. Linear elastic is assumed for reinforcement material. The interface is simulated through the shear interface provided by FLAC. Compaction is simulated by applying uniform pressure to the soil surface at each stage. The simulation is carried out stage by stage (i.e. construction sequence is included). Rainfall that generates pore pressure in soil is simulated by two ways: by assuming the forming of the water table in soil (case I) and by applying the rainfall intensity, represented as the uniform discharge, directly to the soil surface (case II). A construction technique is also simulated in the walls by applying the uniform horizontal pressure to the wall face.
Presented in the results are the displacement profiles obtained from the simulations. These profiles then are compared to the displacement profiles recorded in the field measurements. The simulations give good agreement with the field measurement results.
To highlight the influence of some factors to the behavior of the MSE wall, a series of parametric analysis is performed. Factors such as weight of compactor, compaction distance, reinforcement stiffness, and rainfall play a dominant role in governing the behavior of the MSE-wall.


The investigation of the rainfall as one of the many factors that effects the behavior of four in situ Mechanically Stabilized Earth Wall (MSEW), namely S-Wall, F-Wall, SI-Wall and FI Wall, is presented in this thesis. This investigation is carried out by performing the simulation of the in situ MSE walls. A finite difference based program, named FLAC is utilized for this purpose.
FLAC uses strain softening model to simulate the soil behavior. Linear elastic is assumed for reinforcement material. The interface is simulated through the shear interface provided by FLAC. Compaction is simulated by applying uniform pressure to the soil surface at each stage. The simulation is carried out stage by stage (i.e. construction sequence is included). Rainfall that generates pore pressure in soil is simulated by two ways: by assuming the forming of the water table in soil (case I) and by applying the rainfall intensity, represented as the uniform discharge, directly to the soil surface (case II). A construction technique is also simulated in the walls by applying the uniform horizontal pressure to the wall face.
Presented in the results are the displacement profiles obtained from the simulations. These profiles then are compared to the displacement profiles recorded in the field measurements. The simulations give good agreement with the field measurement results.
To highlight the influence of some factors to the behavior of the MSE wall, a series of parametric analysis is performed. Factors such as weight of compactor, compaction distance, reinforcement stiffness, and rainfall play a dominant role in governing the behavior of the MSE-wall.

Table of Content List of Figures………………………v List of Tables………………………xv Acknowledgements…………………………xviii Chapter 1 Introduction …………………1 1.1 General ………………………………1 1.2 Research Objectives ………………2 1.3 Outline of Thesis …………………2 Chapter 2 Literature Review …………3 2.1 Introduction …………………………3 2.2 Components of Reinforced Soil Structures ……………………………4 2.2.1 Foundation soil …………………4 2.2.2 Backfill ……………………………5 2.2.3 Reinforcement ……………………6 2.2.4 Facing ………………………………6 2.3 Stress Transfer Mechanism and Failure Types of Geosynthetic Reinforced Soil ……………………7 2.3.1 Stress Transfer Mechanism ……7 2.3.1.1 Friction …………………………7 2.3.1.2 Passive Resistance ……………8 2.3.2 Failure Types of Geosynthetic Reinforced Soil Structure ……9 2.3.2.1 External Failure ………………9 2.3.2.2 Internal Failure …………10 2.3.2.3 Overall/Compound Failure …10 2.3.2.4 Facing Failure ………………10 2.4 Analysis of Reinforced Soil Structure in Static Condition …11 2.4.1 Experimental Studies …………11 2.4.1.1 Laboratory Test ………………12 2.4.1.2 Full Scale Wall ………………15 2.4.2 Analytical Approach ……………17 2.4.2.1 Stability Analysis …………18 2.4.2.1.1 Limit Equilibrium Analysis 18 2.4.2.1.2 Strain Compatibility Analysis ………………………21 2.4.2.1.3 Limit Analysis ………………23 2.4.2.2 Deformation Analysis …………24 2.4.2.3 Numerical Analysis ……………26 2.5 Review of Numerical Analyses of GRS Wall in Static Condition ……27 2.5.1 Finite Element-Based Program …28 1. SSCOMP …………………………………28 2. SAFE ……………………………………29 3. DASCAR …………………………………29 4. DSD-SST-2D ……………………………30 5. AFENA ……………………………………30 6. M-CANDE …………………………………31 7. CRISP ……………………………………31 8. ABAQUS …………………………………32 9. GOLIATH …………………………………33 10. GEOFEM …………………………………33 11. DIANA …………………………………34 12. SOIL-STRUCT …………………………34 13. ROSALIE ………………………………35 2.5.2 Finite Difference-Based Program 35 1. FLAC ………………………………………35 Chapter 3 Embankment Description ……37 3.1 Wall Geometry …………………………37 3.2 Soil Properties ………………………37 3.3 Reinforcement Properties …………38 Chapter 4 Numerical Analysis …………39 4.1 FLAC Introduction ……………………39 4.2 Ground Water Analysis in FLAC ……40 4.3 Numerical Model ………………………45 4.3.1 Model Description …………………45 4.3.1.1 Model Geometry …………………45 4.3.1.2 Boundary Condition ……………46 4.3.1.3 Grid generation …………………47 4.3.2 Construction Sequence ……………48 4.3.3Soil Model ………………………49 4.3.3.1Background ………………………49 4.3.3.2 Determination of Input Properties ………………………49 4.3.4 Reinforcement Modeling …………51 4.3.4.1 Reinforcement Arrangement ……51 4.3.4.2 Determination of Input Properties ………………………52 4.3.5 Compaction Modeling ………………53 4.3.6 Rainfall Modeling …………………54 4.3.6.1 Modeling …………………………54 a. Static Simulation ……………………55 b. Transient Simulation …………………55 4.3.6.2 Determination of Input Properties ………………………57 4.3.7 Unbalanced forced …………………59 4.3.8 Some Construction Techniques that Influence the Wall Face Displacement ……………………60 4.4 A Parametric Study of Reinforced Soil Retaining Wall ………………61 Chapter 5 Results and Discussions ……63 5.1 Introduction …………………………63 5.2 Comparison of Numerical Analysis and Field Measurement ………………63 5.2.1 S-Wall Simulation …………………64 5.2.2 F-Wall Simulation …………………68 5.2.3 SI-Wall Simulation ………………71 5.2.4 FI-Wall Simulation ………………74 5.2.5 Development of Pore Pressure …76 5.2.5 Summary ………………………………78 5.3 A Parametric Study Results ………80 5.3.1 Effect of Weight of Compactors 80 5.3.2 Effect of Number of Roller Pass, N ………………………………81 5.3.3 Effect of the Combination of Weight of Compactor and Number of Pass …………………… 82 5.3.4 Effect of Distance of Compaction from the Wall Face …83 5.3.5 Effect of Staying Distance of Compactor ……………………… 83 5.3.6 Effect of Reinforcement Strength ……………………………84 5.3.7 Effect of Reinforcement Stiffness ……………………………84 5.3.8 Effect Distance of Secondary Reinforcement from the WallFace 85 5.3.9 Effect of Pore Pressure …………85 5.3.10 Summary ……………………………86 Chapter 6 Conclusions and Suggestions 89 References …………………………………91 Appendix—Codes and Results Files of FLAC Models …………………………………291

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