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.

Shirasu有大型浮石石。不受干扰的Shirasu似乎像软岩石一样脆弱，但干扰的Shirasu被称为颗粒土壤。不排水的单调三轴测试的侵蚀性已经在具有可碎颗粒的火山土shirasu上进行。结果，发现Shirasu的未排水循环和单调剪切行为在很大程度上取决于限制压力及其密度。 （1）Shirasu的单调和环状剪切行为对局限性的单调和环状剪切行为表现出强烈的依赖，而散布的shirasu偏离压力比和轴向应变却没有。密集的Shirasu的偏离应力比的趋势相反，该趋势随着初始限制压力的增加而减小。（3）松散的Shirasu的剪切行为随着初始有效的限制性压力的增加而显示出越来越大的扩张特性。另一方面，对于密集的Shirasu而言，它显示出越来越多的收缩性行为，而桑迪通常发现的初始限制压力增加。

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。

村岡史基, 岡林巧, 他4名: "「入来」しらす地盤のスウェーデン式サウンディング試験" 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. 476-477 (1998)

Fumiki Muraoka、Takumi Okabayashi 等 4 人：““Iriki”银鱼地面的瑞典测深测试”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。476-477 (1998)。