Department of experimental system for soil-water-structure coupled models by using a drum centrifuge

转鼓离心机土-水-结构耦合模型实验系统系

基本信息

批准号：
07455192
负责人：
KUSAKABE Osamu
金额：
$ 3.78万
依托单位：
Tokyo Institute of Technology (1996)Hiroshima University (1995)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

The main target in this research is to develop a system for simulating a wave phenomenon in a drum centrifuge, which enables us to perform physical modeling of coupled phenomena of soil-water-structure systems. A system was designed to be housed in the existing drum centrifuge of 0.8m in diameter. By consideration of proper similitude, the designed wave generator has a capacity of 15mm stroke and 5.7Hz by a variable motor. A CCD camera was also mounted on the system to trace visually wave actions under centrifugal field. It was proved that the system successfully functions under as much as 100G centrifugal acceleration. It was found that the shape of paddle plays an important role to determine the characteristics of wave generated and four paddles were made and tested to find the best shape. A series of productive tests was carried out to see the responses of pore water pressure in a sand layr due to wave action, revealing that excess pore water pressure of as much as 1.2 kPa was generated, leading a liquefaction phenomenon. The test system established in this study could be applied to examine the stability of structure constructed in or on a sandy layr during wave actions. The outcomes of this research are to appear in two papers, one is "Development of minidrum centrifuges and a few initial tests" in the Proceeding of Recent Development of Soil Mechanics and Pavement Mechanics" to be held in Rio de Janeiro, the other is a domestic meeting of Chugoku Region on Soil Mechanics and Foundation Engineering.

这项研究的主要目标是开发一个系统，用于模拟鼓离心机中的波浪现象，这使我们能够对土壤 - 水结构系统的耦合现象进行物理建模。设计系统的直径为80万的现有鼓离心机中。通过考虑适当的相似度，设计的波发电机的容量为15mm，可通过可变电动机进行5.7Hz。在系统上还安装了CCD摄像头，以跟踪离心场下的视觉波动。事实证明，该系统在多达100克离心加速度下成功发挥作用。发现桨的形状在确定产生的波和四个桨的特征方面起着重要作用，并进行了测试以找到最佳的形状。进行了一系列的生产测试，以查看由于波动作用而导致的砂层中孔隙水压的反应，发现产生了多达1.2 kPa的孔隙水压，导致液化现象。可以应用在这项研究中建立的测试系统来检查波动过程中在砂层中或在砂质上构建的结构的稳定性。这项研究的结果将出现在两篇论文中，其中一篇是“在最新的土壤力学和人行道机制发展中”在里约热内卢举行的“微小离心机的发展和一些初始测试”，另一个是Chugoku地区的家庭会议，在土壤机械和基础工程学上举行。