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.

为了研究振动对路基反力的影响，在干砂堆积层中进行了埋地管道的横向拉拔试验。研究发现，只有当地面受到横向振动时，地基反力才会减小。这种力的减少程度强烈地依赖于震动的强度，而嵌入、砂子密度和频率的影响较小。对振动过程中土体发生液化的饱和水土层进行了进一步的研究。结果表明，动管周围的扩容增大了路基反力。然而，当振动仍在进行时，膨胀机理被破坏了。上述观察到的原因似乎是由于循环应力作用而造成的颗粒接触损失。

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。

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。

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,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。