Effects of inertia force on the dynamic behavior of Sand

惯性力对砂动态行为的影响

• 批准号: 05452239
• 负责人: TOWHATA Ikuo
• 金额: $ 4.67万
• 依托单位: UNIVERSITY OF TOKYO
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452239/
• 关键词: Sand; Shear Strength; wodel test; Subgrade reaction; Shaking table; 慣性力; 埋設管; 砂のせん断強度; 粒子接点力; 地盤反力

A buried pipe was pulled laterally in a dry sand deposit in order to study the effects of shaking on the subgrade reaction force. It was found that the subgrade reaction decreases when and only when the ground was shaken laterally. The extent of this force reduction was strongly dependent on the intensity of shaking, whilst minor effects of embedment, sand density, and frequency were detected. Further studies were made by using water-saturated ground in which soil liquefaction occurred during shaking. It was found that dilatancy around the moving pipe increased the subgrade reaction. However, the mechanism of dilatancy was destroyed when shaking was still on-going. The cause of the observation stated above seems to be the loss of grain contact due to the cyclic stress application.

将埋入的管道横向拉动在干砂沉积物中，以研究摇动对亚级反应力的影响。发现仅当地面横向摇动时，子级反应会减少。这种力减少的程度很大程度上取决于摇动的强度，同时检测到嵌入，沙密度和频率的较小影响。通过使用水饱和地面进行进一步的研究，在摇动过程中发生土壤液化。发现在移动管道周围的膨胀增加增加了子级反应。但是，摇动仍在继续进行时，膨胀机制被破坏了。上述观察的原因似乎是由于循环应力施加而导致的谷物接触丧失。

项目成果

I.TOWHATA,H.TOYOTA: "Dynamic Analysis of Lateral Flow of Liquefied Ground" Japan-US Workshop on Liquefaction Contermesures and Earthquake Resistant Design of Lifeline. Proc.5.

I.TOWHATA,H.TOYOTA：“液化地面侧流动力学分析”日美液化测量与生命线抗震设计研讨会。

I.Towhata: ""Study on Earthquake Response Analysis of Ground"" Proc.Symposium on Amplification of Earthquake Motion, JSSMFE. 2-13 (1994)

I.Towhata：“地面地震反应分析研究”Proc.Symposium on Amplification of Earthquake Motion，JSSMFE。

W.VARGAS-MONGE,M.YAO,I.TOWHATA: "Laboratory Experiments on the Effect of Strong Motion Upon the Shear Strength of a Dry Sand Mass" 土質工学研究発表会論文集. (予定).

W.VARGAS-MONGE、M.YAO、I.TOWHATA：“强运动对干砂体剪切强度影响的实验室实验”土壤工程研究会议论文集（计划）。

I.TOWHATA: "Study on Earthquake Response Analysis of Ground" Proc.Symposium on Amplification of Earthquake Motion in Soft Alluvium22GD03:JSSMFE. 2-13 (1994)

I.TOWHATA：“地面地震响应分析研究”Proc.Symposium on Amplification of Earthquake Motion in Soft Alluvium22GD03：JSSMFE。

I.TOWHATA,H.TOYOTA: "Dynamic Analysis of Lateral Flow of Liguefied Ground" Japan-US Workshop on Liguefaction and Earthguake Resistant Design of Lifeline. Proc.5. (1994)

I.TOWHATA，H.TOYOTA：“液化地面横向流动的动态分析”日美生命线液化与抗震设计研讨会。