权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Evaluation of three dimensional vertical and lateral bearing capacities of pile foundations using X-ray CT

X射线CT评价桩基三维竖向和横向承载力

基本信息

批准号：
15360256
负责人：
OTANI Jun
金额：
$ 8.32万
依托单位：
Kumamoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15360256/
关键词：
Pile Foundation Vertical bearing capacity Lateral bearing capacity X-ray CT scanner Model test Three dimensions Visualization Image processing analysis

项目摘要

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 capacityThere 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 capacityThe 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

本研究的目的是使用 X 射线 CT 扫描仪评估桩基的垂直和横向承载能力。这两个课题的内容分别总结如下：(1)竖向承载力破坏模式有多种类型，如Terzaghi、Meyerhof和Vesic提出的破坏模式。但这些都是出于设计计算的目的而提出的，并不是基于对真实行为的密切观察。本研究的目的是使用 X 射线 CT 扫描仪对垂直荷载桩基下的地面破坏模式进行可视化和表征。这里，进行了一系列不同条件下的模型加载试验，例如桩尖形状、加载过程的影响、土体密度和加载速度，并对每种情况下的模型地面进行扫描。最后，首次在没有任何破坏的情况下在三个维度上对垂直加载桩的承载力机制进行可视化和评估，并确信 X 射线 CT 是岩土工程中的有力工具之一。 (2)横向承载力本研究的目的是使用 X 射线 CT 研究砂中由于横向加载桩而产生的三维 (3-D) 破坏模式。研制了一种新型X射线CT模型加载试验装置，并利用该装置进行了一系列模型加载试验。然后，对模型地面进行 CT 扫描，并在桩头施加多个级别的载荷。不仅重建了地面的横截面图像，还重建了 3D 图像。在这里，进行适当的图像处理分析以获得有效的CT图像。而且，横向荷载桩下地面的破坏模式是可视化的，在三个维度上没有任何破坏。还审查了定量讨论。最后，我们确信首次使用 X 射线 CT 可视化由于侧向荷载桩而导致的地面三维破坏模式。较少的