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研究生： 周曼筠
Masango, Vukile Pearl
論文名稱： 應用中空扭剪試驗探討孔隙水壓變化與液化後體積應變
An Experimental Study on Pore Water Pressure Generation and Post-Liquefaction Volumetric Strain with a Hollow Cylinder Apparatus
指導教授： 張文忠
Chang, Wen-Jong
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： 2024
畢業學年度： 112
語文別： 英文
論文頁數： 116
外文關鍵詞： hollow cylinder apparatus, cyclic strain approach, liquefaction, pore pressure generation curves, post-liquefaction volumetric strain
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    • The study utilized the Hollow Cylinder Apparatus to investigate pore water pressure generation and post-liquefaction volumetric strain on cyclic strain approach basis. Clean Ottawa Sand specimens with varying relative densities, vertical effective stress, and constant shear strain amplitude were prepared using the water sedimentation method. Each specimen underwent cyclic shearing at a frequency of 0.1 Hz, to induce excess pore water pressure generation and subsequent liquefaction, defined at an initial excess pore water pressure ratio. Following liquefaction initiation, specimens were drained to reconsolidated, to measure post-liquefaction volumetric strain. Pore Water Pressure Generation Curves were established by plotting excess pore water pressure ratio against shear strain amplitude for corresponding loading cycles . The results indicated that pore water pressure generation was primarily influenced by relative density, while the rate of accumulation of pore water pressure depended on shear strain amplitude. The post-liquefaction volumetric strain shows to not be influenced by initially applied shear strain amplitude but is affected by the effective vertical stresses and relative density of the soil after consolidation.

    ABSTRACT III ACKNOWLEDGEMENTS IV TABLE OF CONTENTS V LIST OF FIGURES VIII LIST OF TABLES XII CHAPTER 1 INTRODUCTION 1 1-1 Research Background and Motivation 1 1-2 Research Purpose 2 1-3 Research Methods and Processes 2 1-4 Thesis Structure 4 CHAPTER 2 LITERATURE REVIEW 6 2-1 Liquefaction Background 6 2-1-1 Types Of liquefaction 6 2-1-2 Pore Water Pressure Buildup 7 2-1-3 Fine-grained Content 9 2-1-4 Liquefaction Determination Criteria 11 2-1-5 Liquefaction Evaluation Procedures 11 2-2 Liquefaction triggers and consequences 16 2-2-1 Factors influencing liquefaction triggering 16 2-2-2 Consequences of liquefaction 19 2-2-3 Factors influencing Post-liquefaction Volumetric Strain 22 2-3 Development of the Torsional Hollow Cylinder 26 2-3-1 Hight et al (1983) HCA 27 2-3-2 Calculation of Shear stress in HCA 30 2-3-4 Calculation of Shear Strain in HCA 31 CHAPTER 3 TESTING MATERIALS 32 3-1 Design of K_0 Hollow Cylinder Apparatus 32 3-1-1 External Hardware Components 34 3-1-2 Servo Motors 38 3-1-3 Hydraulic Cylinder 40 3-1-4 Pressure Control System 41 3-1-5 Signal Acquisition Module and Signal Amplifier 42 3-1-6 I/O Interface Card 43 3-2 System Control and Automation 43 3-2-1 Servo Motor Subsystem 44 3-2-2 Vertical Load Subsystem 47 3-2-3 Horizontal Load Subsystem 48 3-2-4 LabVIEW Automation and Control 50 3-3 Sensor Calibration 51 3-3-1 Load Cell 52 3-3-2 Torque Transducer 54 3-3-3 Displacement Sensor Calibration 57 3-3-4 Laser Displacement Sensor Calibration 59 3-3-5 Pressure Sensor Calibration 61 3-3-6 Data reduction 62 CHAPTER 4 TEST MATERIALS AND PROCEDURES 63 4-1 Test Program 63 4-2 Physical Properties of Test Material 64 4-3 Specimen Preparation 66 4-3-1 Test Setup 66 4-3-2 Specimen Saturation 68 4-3-3 K_0 Consolidation 69 4-4 Undrained Cyclic Loading 70 4-5 Specimen Reconsolidation 70 4-6 System Verification Control test 70 CHAPTER 5 PORE WATER PRESSURE CURVES 73 5-1 Liquefaction due to Cyclic-Strain Approach 73 5-2 Development of Excess Pore Water Pressure 73 5-2-1 Pore Water Generation for Different Shear Strain Amplitudes 74 5-2-2 Pore Water Generation for Different Relative Densities 77 5-2-3 Pore Water Generation for Different Vertical Effective Stress 79 5-3 Factors Affecting Pore Water Pressure Generation 80 5-3-1 Shear Strain 81 5-3-2 Relative Density 83 5-3-3 Effective Vertical Stress 85 5-4 Test Results Analysis and Findings 85 CHAPTER 6 POST-LIQUEFACTION VOLUMETRIC STRAIN 89 6-1 Post-Liquefaction Volumetric Strain Results 89 6-2 Factors Influencing Post-Liquefaction Volumetric Strain 93 6-3 Test Results Analysis and Findings 96 CHAPTER 7 SUMMARY AND CONCLUSIONS 98 7-1 Conclusions 98 7-2 Suggestion for further Study 99 REFERENCES 100 APPENDIX 104

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