A Study on Liquefaction-Induced Ground Large Displacement

液化引起的地面大位移研究

• 批准号: 08455213
• 负责人: HAMADA Masanori
• 金额: $ 3.78万
• 依托单位: Waseda University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455213/
• 关键词: Liquefaction; Lateral Spread; Foundation Pile; Hyogoken-nanbu Earthquake; Niigata Earthquake; Viscous Flow; Buried Pipes; 基礎; 地盤変位; 地盤ひずみ; 埋設管

The authors' investigation into the mechanisms of liquefaction-induced ground displacements of sloped ground is based on case studies of specific occurrence due to past earthquakes, tests on the characteristics of liquefied soil, model ground experiments by shaking tables. The following were obtained as the main conclusions of the present paper :(1) Liquefied soil behaves as a pseudoplastic liquid during ground flow, but after the earthquake motion cases, the stiffness of the liquefied soil rapidly recovers and it returns to behaving as a solid body ;(2) A similitude law determined by the Reynolds number can be applied between model ground and actual ground, and that the velocity of ground flow and coefficient of viscosity of liquefied soil are proportional to the square root of the liquefied layr thickness, and the square root of the thickness cubed, respectively.Finally, the authors propose a semi-empirical and semi-theoretical formula for estimating the horizontal displacement of sloped ground, where surface gradient, liquefied soil thickness, and mean modified N-values are taken into consideration.

作者通过对历次地震具体发生情况的实例研究、液化土特性试验、振动台模型地面试验等，对坡地液化引起的地面位移机理进行了研究。本文的主要结论如下：(1)液化土在地流过程中表现为假塑性液体，但在地震作用后，液化土的刚度迅速恢复，恢复到固体状态。 (2) 模型地面与实际地面之间可以应用由雷诺数确定的相似定律，地面流速和液化土的粘性系数与雷诺数的平方根成正比。最后，作者提出了一个用于估计斜坡地面水平位移的半经验半理论公式，其中表面坡度、液化土厚度和平均修正N - 值被考虑在内。

项目成果

M.Hamada, K.Wakamatsu, T.Ando: "Liquefaction-Induced Ground Deformation and Its Caused Damage During the 1995 Hyogoken-Nanbu Earthquake" Proceedings from the Sixth Japan-U.S.Workshop on Earthquake Resistant Design of Lifeline Facilities and Countermeasure

M.Hamada、K.Wakamatsu、T.Ando：“1995年兵库县南部地震中液化引起的地面变形及其造成的损害”第六届日美生命线设施抗震设计及对策研讨会论文集

M.Hamada, K Wakamatsu, T.Ando,: "Liquefaction-Lnduced Ground Deformation snd Caused Damage During the 1995 Hyogoken-Nanbu Earthquake," Proceedings from the Sixth Japan-U.S. Workshop on Earthquake Resistant Design of Lifeline Facilities and Countermeasures

M.Hamada、K Wakamatsu、T.Ando，“1995 年兵库县南部地震期间液化引起的地面变形和造成的损害”，第六届日美生命线设施抗震设计及对策研讨会论文集

M. Hamada, K. Wakamatsu, T. Ando: "Liquefaction-Induced Cround Deformation and Its Caused Demage During the 1995 Hyogoken-Nanbu Earthquake" Proceedings from the Sixth Japan-U.S. Workshop on Earthquake Resistant Design of Lifeline Facilities and Countermea

M. Hamada、K. Wakamatsu、T. Ando：《1995 年兵库县南部地震中液化引起的地基变形及其造成的破坏》第六届日美生命线设施抗震设计及对策研讨会论文集

M.Hamada,R.Isoyama,K.Wakamatsu: "Liquefaction-Induced Ground Displacement and Its Related Damage to Lifeline Facilities" Soil and Foundations. 特集号. 81-98 (1996)

M. Hamada、R. Isoyama、K. Wakamatsu：“液化引起的地面位移及其对生命线设施的相关损害”土壤和地基特刊 81-98（1996 年）。

若松 加寿江、濱田 政則、川上 哲太朗: "液状化による地盤の側方流動のメカニズム(その1)-事例分析と液状化土の特性-" 第2回都市直下地震災害総合シンポジウム論文集. 257-260 (1997)

若松一惠、滨田正则、川上哲太郎：“液化引起的地面横向流动的机理（第1部分）——液化土的案例分析和特性——”第二届城市内陆地震灾害综合研讨会论文集257-260（1997）。