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An Experimental Study of Horizontal Behavior of Group Suction Piles in Sand : 사질토 지반에 근입된 그룹형 석션파일의 수평방향 거동에 대한 실험적 고찰

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dc.contributor.advisor김명모-
dc.contributor.author이주형-
dc.date.accessioned2017-07-13T06:38:30Z-
dc.date.available2017-07-13T06:38:30Z-
dc.date.issued2014-08-
dc.identifier.other000000021578-
dc.identifier.urihttps://hdl.handle.net/10371/118704-
dc.description학위논문 (박사)-- 서울대학교 대학원 : 건설환경공학부, 2014. 8. 김명모.-
dc.description.abstractIn this study, a new type of group suction pile as foundations of recently-developed massive and hybrid types of floating structures was proposed to improve the shortcomings of conventional single suction piles. Small-scale model tests were performed to investigate the better performance of the newly developed group suction pile and to estimate its horizontal behavior. To minimize the inherent limitation of small-scale model tests, the model suction piles were manufactured considering the similarity in their geometries, equivalent flexural and axial rigidities, and interface problems (in terms of relative roughness between model pile and sands). Furthermore, for more accurate component behavior analysis (in terms of vertical and horizontal movement as well as rotation) of large-displacement suction pile behavior, Particle Image Velocimetry (PIV) analysis is implemented.
To secure repeatability of the experimental method and to verify the efficiency of the group suction pile, preliminary single suction pile tests were performed under various loading conditions. For the single suction pile, the effect of suction installation method on its ultimate horizontal capacity was evaluated from the model tests and the change of its ultimate horizontal capacity under various combinations of loading location and load inclination was analyzed. The test results of single suction piles were compared with the estimations based on the typically-used equations proposed by other researcher.
From the group suction pile model tests, their horizontal behavior was examined for various loading locations, load inclinations, and component pile spacings. In addition, the effect of cyclic loading on the ultimate and residual horizontal resistances was analyzed. The group effect of group suction piles was assessed by measuring load distribution ratios of component piles.
Strong linear relationship between ultimate horizontal capacity and pile rotation was identified for both single and group suction piles. The rotations of suction piles against horizontal loads were much smaller for group type than for single type. The horizontal resistances of single suction piles rapidly decrease and converge to zero after their ultimate capacities, while considerable residual horizontal resistances were identified for the group suction piles. The residual resistances of group suction piles range from 40% ~ 75% of their ultimate capacities. From the results of the load distributions of component piles, the horizontal resistance for a group suction pile increased with an increasing component pile spacing. Moreover, it is expected the group effect on the ultimate horizontal resistance is not significant for the group suction piles with pile spacing larger than 4 times their pile diameters.
As results, the newly proposed group suction pile in this study effectively resists against horizontal loading regardless of loading location and load inclination (0 and 20 degrees with respect to the horizontal direction) without significant rotation, compared to the case of a single suction pile. Therefore, under horizontal loading conditions, the group suction piles can be considered a more favorable foundation type as a foundation of floating structures compared to the conventional single suction piles.
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dc.description.tableofcontentsABSTRACT ⅰ
TABLE OF CONTENTS ⅳ
LIST OF TABLES ⅷ
LIST OF FIGURES ⅹ
LIST OF SYMBOLS ⅹⅴ


Chapter 1 Introduction 1
1.1 Overview 1
1.2 Suction pile 4
1.2.1 Definition 4
1.2.2 Installation mechanism 6
1.3 Group suction piles 10
1.3.1 Definition 10
1.3.2 Installation method 12
1.3.3 Weakness and limitation of group suction piles 13
1.4 Objectives 15
1.5 Organization of dissertation 17

Chapter 2 Literature review 19
2.1 History of field applications 19
2.2 History of research studies 21
2.3 Recent research on horizontally loaded single suction pile 24
2.4 Recent research on horizontally loaded group pile 34

Chapter 3 Experimental setup 41
3.1 Introduction 41
3.2 Test equipment 42
3.2.1 Soil chamber 42
3.2.2 Horizontal loading system 45
3.2.3 Vibrating compaction system 47
3.2.4 Micro-cone penetration test 49
3.2.5 PIV method 54
3.3 Model pile on the test 57
3.3.1 Design and instrumentation 57
3.3.2 Surface roughness of model pile 69
3.4 Soil conditions 72
3.4.1 Engineering properties of the test sand 72
3.4.2 Size effect 75
3.4.3 Internal scale effect 80
3.4.4 Target relative density 81

Chapter 4 Model tests on single suction pile 83
4.1 Introduction 83
4.2 Test program 86
4.3 Test results and discussion 88
4.3.1 Reliability of the test results 88
4.3.2 Effect of installation method 92
4.3.3 Effect of loading conditions 95
4.4 Summary 104

Chapter 5 Model tests on group suction piles 105
5.1 Introduction 105
5.2 Test program 105
5.3 Test results and discussion 107
5.3.1 Effect of loading conditions 107
5.3.2 Effect of pile spacing 128
5.3.3 Group effect 131
5.4 Summary 133

Chapter 6 Interpretation of model test results 135
6.1 Introduction 135
6.2 Ultimate horizontal resistance 136
6.2.1 Ultimate horizontal bearing capacity of rigid pile 136
6.2.2 Single suction pile 144
6.2.3 Group suction piles 147
6.2.4 Group effect 150
6.3 Comparison of single and group pile 152
6.3.1 Effect of loading conditions 152
6.3.2 Effect of pile spacing 156
6.4 Cost analysis 158
6.5 Summary 164

Chapter 7 Summary and conclusions 167
7.1 Summary 167
7.2 Conclusions and recommendations 171
7.2.1 Conclusions 171
7.2.2 Recommendations 174

References 177
초 록 195
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dc.formatapplication/pdf-
dc.format.extent6440918 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectsuction pile-
dc.subjectgroup suction pile-
dc.subjecthorizontal behavior-
dc.subjectmodel test-
dc.subjectPIV analysis-
dc.subjectgroup effect-
dc.subject.ddc624-
dc.titleAn Experimental Study of Horizontal Behavior of Group Suction Piles in Sand-
dc.title.alternative사질토 지반에 근입된 그룹형 석션파일의 수평방향 거동에 대한 실험적 고찰-
dc.typeThesis-
dc.contributor.AlternativeAuthorLee, Ju Hyung-
dc.description.degreeDoctor-
dc.citation.pagesxviii, 196-
dc.contributor.affiliation공과대학 건설환경공학부-
dc.date.awarded2014-08-
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