2004 Fiscal Year Final Research Report Summary
Stability of Suction Foundation against Eccentric Loading
| Project/Area Number |
15360254
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geotechnical engineering
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
ZEN Kouki Kyushu University, Faculty of Engineering, Professor, 大学院・工学研究院, 教授 (50304754)
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| Co-Investigator(Kenkyū-buntansha) |
OCHIAI Hidetoshi Kyushu University, Faculty of Engineering, Professor, 大学院・工学研究院, 教授 (00039679)
CHEN Guangqi Kyushu University, Faculty of Engineering, Associate Professor, 大学院・工学研究院, 助教授 (50293882)
YASUFUKU Noriyuki Kyushu University, Faculty of Engineering, Associate Professor, 大学院・工学研究院, 助教授 (20166523)
HIRAMATSU Kouzo Kyushu University, Faculty of Engineering, Research Associate, 大学院・工学研究院, 助手 (70380582)
TAKAHASHI Shigeo Kyushu University, The Port and Airport Research Institute, Chief Researcher, 部長 (研究職) (70371747)
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| Project Period (FY) |
2003 – 2004
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| Keywords | Suction foundation / bearing capacity |
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| Research Abstract |
In this study, model test and finite element analysis were performed to clarify the mechanism of bearing capacity of suction foundation against inclined loading. The main findings for the bearing capacity against inclined loading condition are followed ;
1)Horizontal bearing capacity of suction foundation increases with decreasing ratio of inner diameter and outer diameter. In case of D/B=1.1 and vertical bearing capacity=44.1N, the horizontal bearing capacity decreases about 40 and 50% compared to a standard foundation.
2)Horizontal bearing capacity increases as D/B increases and relative density increases.
3)Wedge of strain field is generated around and below a suction foundation. Especially, strain is concentrated adjacent to a foundation.
4)Sliding failure is shown in ground under the foundation if D/B is small. However, wedge failure is shown as D/B and inclined angle increase. The pull out failure is shown between sliding failure and wedge failure.
5)In same loading condition, displacement of foundation increases with increasing D/B and decreasing ration of inner and outer diameter.
In addition, the model test is performed to evaluate the bearing capacity mechanism against eccentric loading. the main findings of suction foundation against eccentric loading are followed ;
1) Vertical bearing capacity decreases with increasing eccentric distance of loading.
2) Bearing capacity decreases as the ratio of inner and outer diameter increases.
3) The shearing ratio of resistance for suction foundation is determined by the sharp of foundation.
4) Tip resistance is developed at beginning of loading. After that, suction foundation lactates around the tip of foundation and lateral resistance are gradually developed.
5) In the case of small eccentric distance, large strain field are shown adjacent to foundation compared to large eccentric distance.
Finally, the pull out test using clayey ground is performed to clarify the mechanism of generating suction and failure mode.
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