Research on the collapse prediction of unsaturated Shirasu slopes in earthquake

非饱和Shirasu边坡地震崩塌预测研究

• 批准号: 08650587
• 负责人: OKABAYASHI Takumi
• 金额: $ 1.15万
• 依托单位: KAGOSHIMA NATIONAL COLLEGE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 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-08650587/
• 关键词: Shirasu; Earthquake; Collapse; Stress path; Cyclic triaxial test; Liquefaction; Volcanic soil; Shear stress ratio; 斜面崩壊; 不飽和; 三軸試験; 半別分類

Shirasu has large pumice stone. Undisturbed Shirasu is seemed such brittle material as soft rock, but disturbed Shirasu is known as a granula soils. Aseries of undrained monotonic triaxial tests has been performed on a volcanic soil Shirasu which has crushable particles. As a result, the undrained cyclic and monotonic shear behavior of Shirasu is found to greatly dependent on the confining pressure and its density. Testing was performed on disturbed spcimens.(1) The monotonic and cyclic undrained shear behavior of Shirasu shows a strong dependence on confining pressure, Toyoura sand does not.(2) In the deviator stress ratio and axial strain for loose Shirasu the deviator stress ratio increased with increasing initial effective confining pressur. The deviator stress ratio for dense Shirasu had the opposite trend of decreasing with increasing initial confining pressure.(3) The shear behavior of loose Shirasu showed increasing dilative characteristics with increasing initial effective confining pressur. That for dense Shirasu, on the other hand, showed increasingly contractile behavior with increasing initial confining pressur as is generally found for sandy.

白松有大块浮石。未受扰动的白松似乎是软岩这样的脆性物质，但扰动白松被称为颗粒状土壤。对具有破碎颗粒的白松火山土进行了一系列不排水单调三轴试验。结果表明，白松的不排水循环单调剪切行为与围压及其密度有很大关系。试验在扰动试样上进行。(1)白苏砂的单调循环不排水剪切特性对围压有较强的依赖性，而东优拉砂则没有。(2)在偏应力比和轴向应变方面，随初始有效围压的增大，偏应力比增大。致密白松的偏应力比随初始围压的增加呈相反的减小趋势。(3)随着初始有效围压的增大，松散白松的剪切特性呈现出增大的扩张特征。另一方面，致密的白松则表现出随着初始围压的增加而增大的收缩行为，这与砂质一般的收缩行为一致。

项目成果

村田 聡子, 岡林 巧 他6名: "「入来」しらすの非排水繰返しせん断特性" 平成9年度土木学会西部支部研究発表会講演概要集. 其の1. 398-399 (1998)

Satoko Murata、Takumi Okabayashi 等 6 人：“‘Iriki’银鱼的不排水循环剪切特性”1997 年日本土木工程师学会西部分会研究报告摘要第 1 部分。398-399 (1998)。

Tetsro YAMAMOTO,Takumi OKABAYASHI,Keisaku KUBO,Nao MATSUMOTO,Kenichi GOU and Tomoyuki MIYABE: "The Disasters Induced by the 1997 Kagoshimaken-hokuseibu and Daini-hokuseibu Earthquakes" Ground Engineering. Vol.15, No.1. 57-73 (1997)

Tetsro YAMAMOTO、Takumi OKABAYASHI、Keisaku KUBO、Nao MATSUMOTO、Kenichi GOU 和 Tomoyuki MIYABE：“1997 年鹿儿岛县北西武地震和第二北西武地震引发的灾害”地面工程。

岡林 巧 他5名: "桜島降下火山灰の三軸せん断特性" 平成8年度土木学会西部支部研究発表会講演概要集. 376-377 (1997)

Takumi Okabayashi 等 5 人：“樱岛火山灰落下的三轴剪切特性”1996 年日本土木工程师学会西部分会研究报告摘要 376-377（1997 年）。

R.SAITO, T.OKABAYASHI, T.OHTAKE, M.MIHARA: "Removal of Manganese and Ironions from The Aqueous Solution by using Shirasu and Volcanic Ash" Proceedings of The Second Kyushu-Taipei International Cangress on Chemical Fngineering. 49-52 (1997)

R.SAITO、T.OKABAYASHI、T.OHTAKE、M.MIHARA：“使用 Shirasu 和火山灰从水溶液中去除锰和铁离子”第二届九州-台北国际化学工程大会论文集。

野元 剛, 岡林 巧 他6名: "「入来」しらすの非排水単調せん断特性" 平成9年度土木学会西部支部研究発表会講演概要集. 其の1. 396-397 (1998)

Tsuyoshi Nomoto、Takumi Okabayashi 等 6 人：“‘Iriki’银鱼的不排水单调剪切特性”1997 年日本土木工程师学会西部分会研究报告摘要第 1 部分。396-397 (1998)。