Mechanism of seepage failure of ground with air bubbles in multi-scale and proposal of counter-measure

含气泡地基多尺度渗流破坏机理及对策建议

• 批准号: 20360210
• 负责人: MAEDA Kenichi
• 金额: $ 11.9万
• 依托单位: Nagoya Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20360210/
• 关键词: 地盤防災; 浸透破壊; 気泡; 過飽和水; 進行性破壊; PIV; SPH; 連成解析; 不飽和

Based upon numerical analysis developed by the representative researcher, the damage of a river dike caused by a localized torrential downpour is presumed to be related to the saturation of the dike, due to seepage water from the dike surface and blow off of pore air (air blow) following a rise in the seepage line in the dike. Since a river dike located at the downstream, where urbanization has been in progress, is composed of sandy soil consisting mainly of soft and fine particles, the river dike is considered to be easily damaged by pore air that has been enclosed within the dike body. In this study, by performing experiments using a dike model equipped with a rainfall generation apparatus, the behavior of a pore air mass captured by rainfall seepage and a rise in the river water level was investigated. When seepage prevention measures using a breathable-waterproof sheet had been taken, the effect of preventing rainfall seepage and that of reducing the pore air pressure were revealed. Development of this soil-water coupled continuum analysis using SPH was also succeeded with account for the process of erosion in which fine particles were flowed.

基于代表性研究者开发的数值分析，由局部暴雨引起的河堤损坏被假定为与堤防的饱和度有关，这是由于堤防表面的渗透水和堤防中浸润线上升后孔隙空气的吹出（空气吹出）。由于位于下游的河堤是由主要由软质和细颗粒组成的桑迪构成的，在城市化进程中，河堤被认为很容易被堤身内封闭的孔隙空气破坏。在这项研究中，通过使用配备有降雨发生装置的堤坝模型进行实验，降雨渗流和河流水位上升捕获的孔隙空气质量的行为进行了研究。当采取透气防水板防渗措施时，显示出防止降雨渗漏和降低孔隙空气压力的效果。发展这种土壤-水耦合的连续分析，使用SPH也成功地考虑到细颗粒的流动的侵蚀过程。

项目成果

粒子回転に着目したファイバー混合土の強度発現メカニズム

以颗粒旋转为核心的纤维混合土强度发展机制

• 发表时间: 2010
• 期刊: 土木学会応用力学論文集 Vol. 13(掲載予定)
• 作者: Ishikawa T.;Hosoda M.;Miura S.;Sekine E.;山口・近藤・前田・Erdin Ibrain
• 通讯作者: 山口・近藤・前田・Erdin Ibrain

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Modelling mechanical consequences of erosion

• DOI: 10.1680/geot.2010.60.6.447
• 发表时间: 2010-06
• 期刊: Geotechnique
• 影响因子: 5.8
• 作者: D. Wood;K. Maeda;E. Nukudani

個別要素法を用いた水平堆積層における落石による衝撃力の伝達挙動解析

水平沉积层落石冲击力传递行为离散元分析

• 发表时间: 2010
• 期刊: 構造物の衝撃問題に関するシンポジウム論文集
• 作者: Ohata Y;ら;(9番目);高村ゆかり;Watanabe A;Ken J.Ishii;亀井淳志・堀江憲路・大和田正明・柚原雅樹・中野伸彦・小山内康人・足立達郎・原有希・寺尾まどか・手打晋二郎・志村俊昭・束田和弘・外田智千・岩田智加・白石和行・石塚英男・高橋裕平;伊藤詔子;西部忠;國弘暁子;高村ゆかり;Nariko Arimura;刈田圭一・前田健一・羽柴寛文・牛渡裕二・川瀬良司
• 通讯作者: 刈田圭一・前田健一・羽柴寛文・牛渡裕二・川瀬良司

粒子構造に着目した粒状体の斜面上の流れ挙動

关注颗粒结构的颗粒材料斜率流动行为

• 发表时间: 2008
• 期刊: 応用力学論文集 11
• 作者: 平林大輝;福間雅俊;前田健一
• 通讯作者: 前田健一