液状化と流体移動：その多様性を実験と無次元数を用いて理解する

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Author: 隅田, 育郎ほか

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Publication date: 2016-05-13

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Note (General)：: 金沢大学理工研究域地球社会基盤学系液状化が起きるための振動条件は何が決めているのだろうか。この問いに答えるために浅部に低浸透率層を持つ液体に浸された粒子層を鉛直に振動させる実験を(a) 加速度と周波数、(b) 液体の粘性率を変えて行なった。その結果(i) 低浸透率層の下に液体が貯留されて重力不安定が...

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Material Type: 文書・図像類
Title: 液状化と流体移動：その多様性を実験と無次元数を用いて理解する
Author/Editor: 隅田, 育郎
Sumita, Ikuro
Author Heading: 隅田, 育郎
Sumita, Ikuro
Publication Date: 2016-05-13
Publication Date (W3CDTF): 2016-05-13
Alternative Title: Understanding the diversity of Liquefaction and fluid transport using dimensionless numbers
Periodical title: 平成27(2015)年度科学研究費補助金基盤研究(C) 研究成果報告書 = 2015 Fiscal Year Final Research Report
No. or year of volume/issue: 2012-04-01 - 2016-03-31
Volume: 2012-04-01 - 2016-03-31
Pages: 5p.-
Text Language Code: jpn
Subject Heading: 液状化
低浸透率層
地震
振動実験
噴砂
粉粒体
加速度
周波数
Target Audience: 一般
Note (General): 金沢大学理工研究域地球社会基盤学系
液状化が起きるための振動条件は何が決めているのだろうか。この問いに答えるために浅部に低浸透率層を持つ液体に浸された粒子層を鉛直に振動させる実験を(a) 加速度と周波数、(b) 液体の粘性率を変えて行なった。その結果(i) 低浸透率層の下に液体が貯留されて重力不安定が起きること、(ii) (i)が起きるための臨界加速度が存在しその値が最小となる周波数があること、(iii) 粘性率が高くなると臨界加速度が小さくなること、が分かりその物理を説明した。本結果は振動の加速度と速度の両方が液状化のために重要であり、高粘性率液体中では粒子間の潤滑の効果により液状化しやすくなる場合があることを示している。
We conducted a series of laboratory experiments in which a liquid-immersed granular medium with a less permeable upper layer is shaken vertically. We varied (a) the acceleration and frequency of shaking, and (b) the liquid viscosity. The experiments were conducted to understand the diversity and scaling relation of the phenomena associated with liquefaction. From the experiments we found that (i) a gravitational instability occurs as a consequence of accumulation of the liquid beneath the less permeable upper layer, (ii) there is a critical acceleration for the instability to occur, (iii) the critical acceleration decreases when the liquid has a higher viscosity. We formulated scaling laws to explain these results. Our results indicate that both shaking acceleration and velocity are important for liquefaction. Furthermore they show that when the liquid is more viscous, a granular medium can become more susceptible to liquefaction due to the enhanced interparticle lubrication.
研究課題/領域番号: 24510246, 研究期間(年度):2012-04-01 - 2016-03-31
DOI: 10.24517/00051901
Access Restrictions: 限定公開
Related Material: https://kaken.nii.ac.jp/search/?qm=90334747
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24510246/
https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-24510246/24510246seika/
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 金沢大学 : 金沢大学学術情報リポジトリKURA