Evaluation of three dimensional vertical and lateral bearing capacities of pile foundations using X-ray CT
| Project/Area Number |
15360256
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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 | Kumamoto University |
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Principal Investigator |
OTANI Jun Kumamoto University, Faculty of Engineering, Professor, 工学部, 教授 (30203821)
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| Co-Investigator(Kenkyū-buntansha) |
OBARA Yuzo Kumamoto University, Faculty of Engineering, Professor, 工学部, 教授 (50135315)
EIKUCHI Yoshiaki Port and Airport Research Institute, Head, 地盤構造部, 室長
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥13,000,000 (Direct Cost: ¥13,000,000)
Fiscal Year 2004: ¥5,400,000 (Direct Cost: ¥5,400,000)
Fiscal Year 2003: ¥7,600,000 (Direct Cost: ¥7,600,000)
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| Keywords | Pile Foundation / Vertical bearing capacity / Lateral bearing capacity / X-ray CT scanner / Model test / Three dimensions / Visualization / Image processing analysis |
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| Research Abstract |
The objective of this research is to evaluate both vertical and lateral bearing capacities of pile foundations using X-ray CT scanner. The contents of these two topics are summarized separately as follows :
(1)Vertical bearing capacity
There are several types of failure patterns such as those proposed by Terzaghi, Meyerhof and Vesic. But those have been proposed for the purpose of design calculation and are not based on close observation of real behavior. The objective of this research is to visualize and to characterize the failure patterns of the ground under vertically loaded pile foundation using X-ray CT scanner. Here, a series of model loading tests with different conditions such as shape of pile tip, effect of loading process, soil density and loading speed were conducted and the model ground was scanned in each case. Finally, the bearing capacity mechanism due to vertically loaded pile was visualized and evaluated in three dimensions without any destruction for the first time and
… More
it is convinced that X-ray CT is one of powerful tool in geotechnical engineering.
(2)Lateral bearing capacity
The objective of this research is to investigate three dimensional(3-D) failure patterns in sand due to laterally loaded pile using X-ray CT. Here, a new apparatus of model loading test especially for X-ray CT was developed and a series of model loading tests were conducted using this apparatus. Then, CT scanning was done for the model ground at several levels of loadings which were applied at the pile head. Not only cross sectional images for the ground but also those in 3-D were reconstructed. Here, a proper image processing analysis was conducted in order to obtain effective CT images. And, the failure patterns of the ground under laterally loaded pile were visualized without any destruction in three dimensions. Quantitative discussion was also examined. Finally, it is convinced that three dimensional failure patterns of the ground due to laterally loaded pile were visualized for the first time using X-ray CT. Less
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Report
(3 results)
Research Products
(24 results)
