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

DEVELOPMENT CENTRIFUGAL FLUID-WAVE GENERATING SYSTEMS

开发离心流体波发生系统

基本信息

批准号：
06555141
负责人：
SEKIGUCHI Hideo
金额：
$ 2.5万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555141/
关键词：
Centrifuge testing Liquefaction Seabed Repeated load Stormy wave Pore pressure 塑性

项目摘要

A fluid-wave generating system for use in geotechnical centrifuges has been developed, with the aim of providing a new research tool for investigating into wave-seabed interaction. The wave generating system developed in this research included a servo-motor driven flap-type wave generator, a wave tank, a wave absorber of vertical slotted wall construction, and a sediment trench. With this system it has proven possible to generate a range of nearly progressive waves in a wave tank, and to look at the response of sediments to passage of wave trains, under a prescribed steady-state centrifugal acceleration.One of the important considerations was to select a fluid so as to facilitate the control of dynamic viscosity of the fluid, according to the level of the centrifugal acceleration imposed. This particular procedure was effective to meet simultaneously the requirements of similitude as to wave propagation as well as consolidation processes. The experimental program in this research consisted of two series of wave tests. The first series of experiments was concerned with wave tests over a "non-deforming" base and aim to assess the performance of the wave-absorbers with a range of structural parameters, such as the slotted area ratio and the length of a reservoir behind the wave absorber. It was found that under most favorable test conditions, the reflection coefficient of the wave absorbers was as low as 15%. The second series of experiments was concerned with nearly progressive wave tests with sandy sediments. The accumulation of excess pore pressures in the sediments due to wave action has clearly been observed, indicating the capability of this experimental system for investigating into wave-induced liquefaction or such other important physical processes.

开发了一种用于土工离心机的流体-波浪发生系统，旨在为波浪-海床相互作用的研究提供一种新的研究工具。本研究开发的造波系统包括伺服电机驱动的拍板式造波机、波浪水池、垂直开槽墙体结构的消波体和泥沙沟。有了这个系统，就可以在波浪池中产生一系列近乎行进的波，并在规定的稳态离心力加速下观察沉积物对波列通过的响应。其中一个重要的考虑因素是根据施加的离心力的水平来选择一种流体，以便于控制流体的动态粘度。这一特殊程序有效地同时满足了波传播和固结过程的相似性要求。本研究的实验方案包括两个系列的波浪测试。第一系列实验是在“不变形”的基础上进行波浪测试，目的是评估具有一系列结构参数的吸波体的性能，例如缝隙面积比和吸波体后面的水库长度。结果表明，在最有利的试验条件下，吸波材料的反射系数最低可达15%。第二个系列的实验是关于沙质沉积物的近行波测试。已清楚地观察到由于波浪作用在沉积物中积累的超孔压，这表明该实验系统有能力研究波浪诱导的液化或其他重要的物理过程。