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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 郭安妮(On-Lei Annie Kwok) | |
| dc.contributor.author | Jia-Ren Liu | en |
| dc.contributor.author | 劉家任 | zh_TW |
| dc.date.accessioned | 2021-06-15T13:52:49Z | - |
| dc.date.available | 2020-08-20 | |
| dc.date.copyright | 2020-08-20 | |
| dc.date.issued | 2020 | |
| dc.date.submitted | 2020-08-14 | |
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Znidarcic, D., Illangasekare, T. and Manna, M. (1991). Laboratory testing and parameter estimation for two-phase flow problems. Proceedings of the Geotechnical Engineering Congress, Boulder, Colorado, McLean, Campbell and Harris, Eds., ASCE, New York, 1078-1089. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/51842 | - |
| dc.description.abstract | 不飽和土壤的課題存在於許多大地工程相關案例中，尤其是當案例場址發生在地下水位面附近時，不飽和土壤的問題應該被納入工程設計參考中。前人透過進行許多不飽和土壤試驗後發現，土壤在不飽和條件下有提升剪力強度及抗液化能力的效果，而隨著土壤飽和度下降，土壤強度逐漸提升。本研究以實驗方法進行土壤試體在不飽和狀態下受靜態及反覆循環載重後呈現的土壤行為。為了在實驗室中進行試驗，本研究發展了以三軸方法進行不飽和土壤試驗的實驗流程，而實驗流程可分為五個項目，其中包括了以濕霣降法進行土壤試體重模，及使用定流量泵以飽和度控制方法降低土壤試體飽和度；三軸底座經過改良可將高進氣陶板嵌入其中，以進行使用了軸平移技術的不飽和土壤三軸試驗。實驗結果顯示，土壤試體進行不排水靜態加載過程中，當剪切至大應變時，土壤試體表現出剪脹性；而從不排水的不飽和動態三軸試驗中發現，降低飽和度引致土壤試體抗液化潛能提升的效果並不明顯，此項發現與前人進行的研究比較後，歸結出以下幾兩點可能因素，其一為土壤顆粒大小的不同及試體到達目標飽和度階段採用的流程不同所致，研究成果在進行討論後統整出結論及研究建議，本研究的成果可成為後人進行不飽和土壤三軸試驗的參考。 | zh_TW |
| dc.description.abstract | Dynamic properties are often determined for sand at completely dry or completely saturated condition. Available correlation relationships for dynamic parameters and liquefaction potential are mainly applicable for saturated soils. The objective of this research is to perform extensive laboratory study (in terms of static triaxial tests, cyclic triaxial tests and flow pump tests) to determine the static and dynamic properties of unsaturated sand. The modified procedures for unsaturated sample preparation and conducting triaxial tests are developed, including the usage of wet pluviation for preparing remold specimens, usage of flow pump device for controlling the degree of saturation, modification of the pedestal in the triaxial apparatus for the fulfillment of the axis translation technique. The test results show that the unsaturated soil specimens exhibit dilative behavior under static loading with undrained condition at large axial strain. On the other hand, unlike the trend observed by other researchers, lowering the degree of saturation do not significantly increase the liquefaction resistance. This inconsistence may be due to the difference in the grain size of the specimens and the method to achieve the unsaturated state. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T13:52:49Z (GMT). No. of bitstreams: 1 U0001-0808202017061500.pdf: 13050064 bytes, checksum: 4035a1f775d6b041d48191566ee4e677 (MD5) Previous issue date: 2020 | en |
| dc.description.tableofcontents | 謝辭 I 摘要 III ABSTRACT IV TABLE OF CONTENTS V LIST OF FIGURES VIII LIST OF TABLE XIII SYMBOLS XIV CHAPTER 1 INTRODUCTION 1 1.1 Introduction 1 1.2 Research Method 2 1.3 Thesis Organization 3 CHAPTER 2 LITERATURE REVIEW 4 2.1 Fundamental of Unsaturated Soil Behavior 4 2.1.1 Composition of Unsaturated Soil 5 2.1.2 Definition of Unsaturated Soil Strength 7 2.1.3 Axis-Translation Technique 10 2.1.4 Soil-Water Characteristic Curve (SWCC) 11 2.1.5 Measurements of Matric Suction 14 2.2 Unsaturated Static Triaxial Test 18 2.2.1 Selection of Strain Rate 19 2.2.2 Large Deformation State and Corresponding Critical State 21 2.3 Soil Liquefaction 27 2.3.1 Liquefaction Failure Criteria 28 2.3.2 Types of Liquefaction Failure 28 2.3.3 Liquefaction Resistance 31 2.4 Unsaturated Soil Liquefaction 36 2.4.1 Unsaturated Cyclic Test without Applying Axis Translation Technique 38 2.4.2 Research on Unsaturated Soil Liquefaction (Okamura and Soga, 2006) 39 2.4.3 Research on Unsaturated Soil Liquefaction (Okamura and Noguchi, 2009) 41 2.4.4 Research on Unsaturated Soil Liquefaction (Unno et al., 2008) 44 2.5 Soil Specimen Remold Methods 47 2.6 Summary 49 CHAPTER 3 EXPERIMENTAL PROGRAM 51 3.1 Objectives 51 3.2 Materials and Physical Properties 51 3.3 Preparation of The Experimental Specimen 55 3.4 Apparatus 56 3.4.1 GDS Instrument System 56 3.4.2 High Air Entry Ceramic 63 3.4.3 Modified Pedestal 65 3.4.4 Flow pump 67 3.5 Saturation of HAE ceramic 69 3.6 Modified Consolidated Isotropic Undrained Triaxial Compression (CIUC) test 71 3.6.1 Remold Stage 71 3.6.2 Saturation Stage 76 3.6.3 Consolidation Stage 77 3.6.4 Water Exiting Stage 79 3.6.5 Loading Stage 81 3.7 Modified Consolidated Isotropic Undrained Cyclic Triaxial (CIUCyc) test 82 3.8 Flow Pump Test 85 CHAPTER 4 EXPERIMENTAL RESULTS AND DISCUSSIONS 86 4.1 Results and Discussions of Flow Pump Test 87 4.2 Results of the Modified CIUC tests 90 4.2.1 Advantage of Using Modified Pedestal 93 4.2.2 Effect of Degree of Saturation on Soil Behavior under Static Triaxial Test 95 4.2.3 Failure Mode After CIUC Test 100 4.3 Results and Discussions of Modified CIUCyc tests 101 4.3.1 Saturated Specimen 105 4.3.2 Unsaturated Specimen 111 4.3.3 Liquefaction Failure Mode 119 4.4 Results and Discussion of Effect of Degree of Saturation on Liquefaction Resistance 120 4.4.1 Effect of Degree of Saturation on CSR-N Curves 120 4.4.2 Liquefaction Resistance Ratio 121 CHAPTER 5 CONCLUSIONS AND RECOMMENDATIONS 126 5.1 Conclusions 126 5.2 Recommendations for Future Researches 129 REFERENCES 130 APPENDIX A 140 APPENDIX B 172 | |
| dc.language.iso | en | |
| dc.subject | 土壤液化 | zh_TW |
| dc.subject | 三軸試驗 | zh_TW |
| dc.subject | 土壤剪脹性 | zh_TW |
| dc.subject | 濕霣降法 | zh_TW |
| dc.subject | 定流量泵 | zh_TW |
| dc.subject | 軸平移技術 | zh_TW |
| dc.subject | 不飽和土壤 | zh_TW |
| dc.subject | triaxial test | en |
| dc.subject | dilation | en |
| dc.subject | soil liquefaction | en |
| dc.subject | axis translation technique | en |
| dc.subject | flow pump device | en |
| dc.subject | wet pluviation method | en |
| dc.subject | unsaturated soil | en |
| dc.title | 以實驗方法探討不飽和砂質土壤之液化行為研究 | zh_TW |
| dc.title | Experimental Investigation of the Liquefaction Behavior of Unsaturated Sandy Soil under Cyclic Loading | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 108-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 楊國鑫(Kuo-Hsin Yang),鄧福宸(Fuchen Teng) | |
| dc.subject.keyword | 不飽和土壤,軸平移技術,定流量泵,濕霣降法,土壤剪脹性,三軸試驗,土壤液化, | zh_TW |
| dc.subject.keyword | unsaturated soil,axis translation technique,flow pump device,wet pluviation method,dilation,triaxial test,soil liquefaction, | en |
| dc.relation.page | 175 | |
| dc.identifier.doi | 10.6342/NTU202002685 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2020-08-14 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 土木工程學研究所 | zh_TW |
| 顯示於系所單位： | 土木工程學系 | |
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