The effect of on-site-cast C-RHA micropiles on slope stability by centrifuge modeling

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彭萬(Nurza Purwa Abiyoga) 查詢紙本館藏

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土木工程學系

論文名稱

(The effect of on-site-cast C-RHA micropiles on slope stability by centrifuge modeling)

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至系統瀏覽論文 (2026-8-15以後開放)

摘要(中)

稻殼灰 (Rice Husk Ash, RHA) 常用來替代水泥作為卜作嵐材料，以降低水泥需求量且減少製程中溫室氣體排放量。稻殼灰混凝土 (Concrete-Rice Husk Ash, C-RHA) 微型樁為一種具環保與高經濟效益之邊坡加勁工法，其增加邊坡穩定性原理與土釘相似。本研究以中央大學地工離心機進行七組靜態試驗，透過增加人造離心力場直至邊坡破壞，探討場鑄C-RHA微型樁的早期強度與樁身完整性對邊坡穩定適用性與影響。邊坡以石英砂與高嶺土混合並採濕搗法製作，模型高度為200 mm，坡度為70 度，黏土質砂單位重為17.81 kN/m3，含水量為13.3%。 C-RHA微型樁由50% 石英砂、30% 稻殼灰與20% 水泥均勻拌合製成，含水量為90%。C-RHA微型樁直徑為5% H，長度為50% H，其中H為邊坡高度。
離心模型試驗結果顯示: (1) 在C-RHA微型樁加勁區域面積與總坡面面積比為 2.95×10-2 條件下，場鑄C-RHA微型樁加勁工法可以有效提高邊坡穩定性，其中，下排微型樁距離坡趾高度為23.5% H； (2) 場鑄微型樁的早期強度較預鑄微型樁低，因此早期需架設臨時性側向支撐。然而，場鑄微型樁經過28天養護後，其加勁之邊坡穩定性較佳； (3) 場鑄微型樁身之蜂窩現象與澆置造成之土壤擾動會影響其邊坡穩定性，而場鑄微型樁之長度對邊坡穩定性影響不顯著。

摘要(英)

Rice Husk Ash (RHA) is a pozzolanic material commonly used for cement substitution. RHA utilization could reduce cement consumption and greenhouse gas emissions. Concrete-Rice Husk Ash (C-RHA) micropile is proposed as an eco-friendlier and cost-efficient slope reinforcement by utilizing RHA and working similarly with soil nails. Seven centrifuge models simulated slopes reinforced with on-site-cast C-RHA micropiles subjected to increased gravitational acceleration. This study investigates the serviceability of on-site-cast C-RHA micropiles in stabilizing slopes by considering the early strength and imperfection of micropiles. The compacted slopes are made from clayey sand with 17.81 kN/m3 dry density and 13.3% water content, with a 200 mm slope height and 70° inclination angle. The micropile is 5%H in diameter and 50%H in length (H = slope height). The micropiles made from 50% soil, 20% cement, and 30% RHA with a 90% water content.
The test results show that (1) C-RHA micropiles effectively improve the slope stability if implemented at a 2.95×10-2 reinforcement area to slope area ratio, with the lowest micropiles row located at 23.5%H from the slope toe; (2) Temporary lateral support is required due to the small contribution of the micropiles in the early period after the installation. However, after 28 days of curing, the on-site-cast method provides higher slope stability than the precast method; (3) Short micropiles experience pull-out failure and do not significantly increase shear strength. Shear strength decrement was observed on the model with alveolate micropiles. The shear strength loss, indicated by the decrement of the gravity level to make the slope fail, was due to soil structure disturbance and poor replacement-material strength.

關鍵字(中)

★ 離心模型試驗
★ 微型樁
★ 稻殼灰
★ 邊坡穩定

關鍵字(英)

★ Centrifuge modeling
★ Micropile
★ Rice husk ash
★ Slope stability

論文目次

ABSTRACT vii
摘要 viii
ACKNOWLEDGMENTS ix
TABLE OF CONTENT x
LIST OF FIGURES xiii
LIST OF TABLES xvii
NOMENCLATURE xviii
CHAPTER 1 INTRODUCTION 1
1.1 Background 1
1.2 Research Objectives 4
1.3 Research Concept and Method 4
1.4 Scope 5
CHAPTER 2 LITERATURE REVIEW 7
2.1 Landslide 7
2.2 Slope Stability Analysis 8
2.3 Micropiles and Soil Nails 9
2.4 On-Site-Cast and Precast Construction Method 11
2.5 Rice Husk Ash as Cement Substitutes 12
2.6 Depletion and Accumulation of Soil Mass 13
2.7 Angle of Reach 14
2.8 Geotechnical Centrifuge Modeling 15
2.9 Centrifuge Modeling of Micropiles and Soil Nails for Slope Reinforcement 17
CHAPTER 3 GEOTECHNICAL CENTRIFUGE MODELING 21
3.1 Material Properties 21
3.1.1 Soil Properties 21
3.1.2 Mortar Properties 22
3.2 Instrumentation 24
3.2.1 Mortar Injector 24
3.2.2 Geotechnical Centrifuge 25
3.2.3 Handheld Vane Shear Device 29
3.3 Centrifuge Test Procedure 30
3.3.1 Slope Model Preparation 32
3.3.2 Geotechnical Centrifuge Tests 34
3.3.3 Post-Test Evaluation 35
CHAPTER 4 TEST RESULTS AND DISCUSSION 37
4.1 Geotechnical Centrifuge Test Results 37
4.1.1 MP00_C00 37
4.1.2 MP04_C07_S 40
4.1.3 MP04_C07 43
4.1.4 MP09_C07_A 46
4.1.5 MP09_C07 49
4.1.6 MP16_C07 52
4.1.7 MP16_C28 55
4.1.8 Geotechnical Centrifuge Tests Resume 58
4.2 C-RHA Micropile Performance 61
4.2.1 Post-test Condition of Micropiles 61
4.2.2 Micropiles′ Contribution to Slope Stabilization 64
4.3 Effects of Micropiles-Slope Area Ratio on Slope Stability 66
4.4 Precast and On-site-cast C-RHA Micropiles Comparison 67
4.5 Correlation of Micropiles Curing Time and Slope Stabilization 69
4.6 Design and Construction 69
4.6.1 Information required for design 70
4.6.2 Reinforcement design based on test results 71
4.6.3 Construction process 72
CHAPTER 5 CONCLUSIONS AND RECOMMENDATIONS 78
5.1 Conclusion 78
5.2 Future Works and Recommendations 78
BIBLIOGRAPHY 80
APPENDIX

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指導教授

洪汶宜(Hung Wen-Yi)

審核日期

2022-8-24

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