特殊土の何が地盤災害を引き起こすのか～破砕性土地域の災害脆弱性の克服

特殊土壤发生地面灾害的原因是什么？ - 克服脆性土壤地区的灾害脆弱性

• 批准号: 21H01423
• 负责人: 海野 寿康
• 金额: $ 10.32万
• 依托单位: Utsunomiya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2021
• 资助国家: 日本
• 起止时间: 2021-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21H01423/
• 关键词: 軽石; 粒子破砕; 降雨浸透; 液状化; 崩壊; 単粒子破砕試験; 繰返しせん断; 中空ねじりせん断試験; 降雨模型盛土実験; 破砕モデル; 強風化土; 斜面崩壊; 3次元個別要素法; 数値モデル; 特殊土; 不飽和土; 地盤災害

本研究では，粒子破砕性や軽い土粒子密度，非塑性細粒分に代表される特殊な性質を有する破砕性土の災害脆弱性メカニズムの把握を行う．2022年度は，研究2年度であり，破砕性土の代表的な土である火山灰質粗粒土のうち，昨年度同様に軽石に着目した要素力学試験を分担研究機関（宇都宮大）にて実施，粒子破砕とせん断変形挙動の関係性の把握を行った．なお，昨年度の赤玉土（栃木県鹿沼市産）の他，小笠原諸島近海の海底火山によって発生し海洋を漂流した軽石を入手し，その試料も用いて検討を行っている．なお，2022年度は，特殊土用のせん断試験装置として，2021年度に改良した中空ねじりせん断試験や三軸試験の他，土粒子単体の破砕挙動を観察するための特殊載荷装置として，単粒子破砕試験装置が必要になるか，こちらも2021年度から整備を進め，2022年度に載荷装置，計測装置，観察用機材が揃い本格的に運用を開始した．2022年度は，これら機材を用いて2021年度から継続して，土粒子単体および集合体である土のせん断強度，せん断変形特性の把握を行った．試験対象土は，2021年度同様に研究担当機関が所在する地域に分布する火山灰質土を使用した他，2018年北海道胆振東部地震時の崩壊土砂や，笠原諸島・北硫黄島付近にある海底火山起源の軽石など，全国各地の軽石混じり土を用いて試験を行った．得られた室内試験結果を基に，数値解析モデルの構築を分担する研究分担者（横浜国大 他）はそれぞれモデルの開発を進めているとともに，数値実験担当者（東北大）が3次元個別要素法を用いて，単粒子破砕試験による粒子単体の破砕挙動の再現，ならびに土単粒子の集合体である土のせん断試験挙動再現を進めた．以上より得られた成果は，2021年度同様に，研究担当者が所属する地盤工学会や土木学会などの研究発表会やシンポジウム等で発表した．

In this study, particle fragmentation, soil particle density, non-plastic fine particles, representative of special properties, and disaster vulnerability of destructive soil were determined. In 2022, the study was conducted in 2nd year, and the representative of destructive soil, volcanic ash coarse particles, was determined in 2022. In 2022, the same study was conducted in the same year. The relationship between particle size and particle size is controlled. In the past year, Akamatsu (Tochigi, Kanuma City) and others, Ogasawara Islands offshore submarine volcanoes have developed and the ocean has drifted to the rock, and the sample is used in the middle of the discussion. In 2022, special soil test equipment and equipment, in 2021, improved hollow test equipment and three-axis test equipment, special load equipment and equipment for particle particle breakage test equipment are required, in 2021, equipment and equipment are advanced, in 2022, load equipment and measuring equipment are installed. In 2022, the use of inspection machinery materials began. In 2021, the use of inspection machinery materials began. In 2022, the use of inspection machinery materials began. In 2021, the use of inspection machinery materials began. In 2022, the use of inspection machinery materials began. In 2021, the use of inspection machinery materials began. In 2022, the use of inspection machinery materials began. In 2021, the use of inspection machinery materials began. In 2021, the use of inspection machinery materials began. In 2022, the use of inspection machinery materials began. In 2021, the use of inspection machinery materials began. In 2022, the use of inspection machinery materials began. In 2021, the use of inspection machinery materials began. In 2022, the use of inspection machinery materials began. In 2021, the use of inspection machinery materials began. In 2022, the use of inspection machinery materials began. In 2021, the use of inspection machinery materials began. In 2021, the use of inspection machinery materials In 2021, the same research was conducted on the distribution of volcanic ash soil in the region where the responsible organization was located. In 2018, the collapse of volcanic ash soil during the earthquake in the eastern part of Hokkaido was carried out. In the vicinity of Kasahara Islands and North Iwo Island, the origin of submarine volcanoes was studied. The results of indoor tests are based on the analysis of numerical values, the construction of numerical values, and the development of numerical values. In addition, the analysis of numerical values is based on the use of three-dimensional individual element methods, and the reproduction of individual particle dynamics in individual particle dynamics is based on the aggregation of individual particle dynamics. The above achievements were made in the same year of 2021, and the research leaders were affiliated with the Institute of Construction Engineering and the Institute of Civil Engineering.

项目成果

Development of constitutive model describing unsaturated liquefaction characteristics of volcanic ash soil

描述火山灰土不饱和液化特性的本构模型的建立

• 发表时间: 2022
• 作者: Takaki Matsumaru;Toshiyasu UNNO
• 通讯作者: Toshiyasu UNNO

VARIATION OF HYDRAULIC CONDUCTIVITY IN SANDY SOIL DUE TO UNDRAINED CYCLIC SHEAR LOADING

不排水循环剪切荷载引起的砂土水导率变化

• DOI: 10.2208/jscejge.77.4_386
• 发表时间: 2021
• 期刊: Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)
• 作者: 渡邊 唯;海野 寿康;加村 晃良
• 通讯作者: 加村 晃良

Weathering of mudstone and its effect on the long-term stability of a cut slope

泥岩风化及其对路堑边坡长期稳定性的影响

• 发表时间: 2022
• 作者: Bhowmik;S.;Kikumoto;M. and Nagata;M.
• 通讯作者: M.

埋立処分場内土砂の強制減容化工法と減容化土の液状化抵抗

垃圾填埋场土体强制减容法及减容土抗液化性能

• 发表时间: 2021
• 作者: 渡邊唯;海野寿康
• 通讯作者: 海野寿康

University of Dundee(英国)

邓迪大学（英国）