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研究生： 李奕新
I-Hsin Lee
論文名稱： Performance and design of geosynthetic-reinforced soil slopes subjected to rainfall: considering regional hydrological conditions
Performance and design of geosynthetic-reinforced soil slopes subjected to rainfall: considering regional hydrological conditions
指導教授： 楊國鑫
Kuo-Hsin Yang
鄧福宸
Fu-Chen Teng
口試委員: 吳淵洵
Jason Wu
李安叡
An-Jui Li
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： 2018
畢業學年度： 106
語文別： 英文
論文頁數： 95
中文關鍵詞： 地工加勁結構 、低滲透回填土 、降雨臨界閥值 、降雨頻率延時曲線
外文關鍵詞： Geosynthetic-reinforced soil, Marginal backfill, Rainfall threshold, Intensity– duration-frequency curve
相關次數： 點閱：250  下載：4 
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    • A series of numerical analyses based on the framework of transient seepage and unsaturated soil mechanics was performed to investigate the impact of rainfall on the design of geosynthetic-reinforced soil (GRS) slopes. To consider the regional hydrology, the antecedent and major rainfall were input using the rainfall intensity-duration-frequency (I-D-F) curves from Taipei as an example. The numerical simulations consider backfill fine contents (i.e., 0, 6, 19, 30 and 60%), soil initial matric suctions (i.e., as compacted, after plum rain, and after typhoon), and major rainfall conditions (i.e., 7-day extremely heavy rainfall and 1-day torrential rainfall). The hydraulic responses and stability of the GRS slopes including porewater pressure development, factor of safety (FS), and required reinforcement strength (Treq) are evaluated and compared. The numerical results reveal that under the combined effects of plume rainfall and 7-day extremely heavy rainfall the GRS slopes with high backfill fine contents (≥ 19%) could develop high porewater pressure which consequently leads to the slope failure. To satisfy FS ≥ 1.1 under the prescribed rainfall conditions, the Treq values in the GRS slopes with backfill fine contents of 30% and 60% should be increased by 2.65 and 2.06 times, respectively, of the original design values in which the effect of rainfall is not included: the corresponding FS values are 1.48 and 1.64, respectively, when the increased Treq values are used in the original design. The rainfall thresholds for the GRS slopes with various backfill fine contents and antecedent rainfall conditions were established. The calculated rainfall thresholds as well as those determined from failure cases of GRS structures were compared with the regional rainfall I-D-F curves to facilitate the assessment of selecting backfill type for the GRS structure in the region of interest.

    A series of numerical analyses based on the framework of transient seepage and unsaturated soil mechanics was performed to investigate the impact of rainfall on the design of geosynthetic-reinforced soil (GRS) slopes. To consider the regional hydrology, the antecedent and major rainfall were input using the rainfall intensity-duration-frequency (I-D-F) curves from Taipei as an example. The numerical simulations consider backfill fine contents (i.e., 0, 6, 19, 30 and 60%), soil initial matric suctions (i.e., as compacted, after plum rain, and after typhoon), and major rainfall conditions (i.e., 7-day extremely heavy rainfall and 1-day torrential rainfall). The hydraulic responses and stability of the GRS slopes including porewater pressure development, factor of safety (FS), and required reinforcement strength (Treq) are evaluated and compared. The numerical results reveal that under the combined effects of plume rainfall and 7-day extremely heavy rainfall the GRS slopes with high backfill fine contents (≥ 19%) could develop high porewater pressure which consequently leads to the slope failure. To satisfy FS ≥ 1.1 under the prescribed rainfall conditions, the Treq values in the GRS slopes with backfill fine contents of 30% and 60% should be increased by 2.65 and 2.06 times, respectively, of the original design values in which the effect of rainfall is not included: the corresponding FS values are 1.48 and 1.64, respectively, when the increased Treq values are used in the original design. The rainfall thresholds for the GRS slopes with various backfill fine contents and antecedent rainfall conditions were established. The calculated rainfall thresholds as well as those determined from failure cases of GRS structures were compared with the regional rainfall I-D-F curves to facilitate the assessment of selecting backfill type for the GRS structure in the region of interest.

    Abstract I Acknowledgement II Table of Contents III List of Figures VI List of Tables IX Chapter 1 Introduction 1 1.1 Research background and motivation 1 1.2 Research objectives 4 1.3 Research organization 4 Chapter 2 Literature Review 7 2.1 Basic theory in unsaturated soils 7 2.1.1 State of unsaturated soil 7 2.1.2 Hydraulic properties 8 2.1.3 Unsaturated soil shear strength 11 2.2 Slope stability against rainfall 12 2.2.1 Backfill soil 12 2.2.2 Infiltration process 13 2.2.3 Geosynthetic interface shear strength 15 2.2.4 Rainfall threshold and I-D-F curve 16 Chapter 3 Model Validation 19 3.1 Validation case history 19 3.2 Validation of numerical analysis 19 3.2.1 Transient seepage analysis 20 3.2.2 Limit equilibrium analysis 23 3.3 Comparison of the result 24 Chapter 4 Numerical Program 27 4.1 Slope configuration 27 4.2 Backfill materials 28 4.3 Reinforcement tensile loads 32 4.3 Antecedent rainfall for initial conditions 34 4.4 Major rainfall 37 4.5 Boundary condition 39 4.6 Simulation procedure 41 Chapter 5 Results and Discussion 42 5.1 Simulation results 43 5.1.1 Slope stability 43 5.1.2 Porewater pressure response 48 5.1.3 Summary 54 5.2 Failure cases 57 5.3 Numerical scheme of rainfall threshold curve 60 5.4 Result of rainfall threshold curve 61 5.5 Parametric study 65 5.6 Case history validation 67 Chapter 6 Conclusion and Recommendation 69 6.1 Conclusion 69 6.2 Suggestion for engineering application 70 6.3 Recommendation for future research 70 Notations 71 Abbreviations 72 References 73

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