Study and prediction method development of the progressive failure of embankment and gentle slope caused by excess pore water pressure propagation

超孔隙水压力传播引起的路堤及缓坡渐进破坏研究及预测方法开发

• 批准号: 16206048
• 负责人: KAZAMA Motoki
• 金额: $ 17.56万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16206048/
• 关键词: geotechnical engineering; soil disaster; phenomenon of geo-sphere; geology; earthquake engineering; liquefaction; 間隙水圧; 進行性破壊; 不飽和土; 火山灰質砂質土; サクション; 斜面崩壊; 水分特性; 盛土地盤

Progressive delay failure, in which fill and gentle slope fails after main earthquake motion, is being paid attention. For example, during the 2003 Sanriku-Minami earthquake and the 2003 Miyagi-ken Hokubu earthquake, sandy fill slopes failed like a mud flow. It was clear that pore water played important role in the failure, because failed soils contained much water and behaved like a mud. In this study, we have tried to make clear the failure mechanism of such a failure and to develop the prediction method. It was thought that excess pore water pressure generated by the vibration play an important role and the propagation of the excess pore water pressure is the cause of delayed failure. The results of this study are summarized as follows;1. We proposed a new idea to evaluate the liquefaction potential of unsaturated sandy soils based on the undrained cyclic shear test and it was confirmed experimentally. From the results, the liquefaction mechanism of unsaturated soils is clarified.2. Based on the residual deformation after undrained cyclic shear test, it was found that the shear deformation was related to the dilatancy characteristics of soil. These results are applicable to the evaluation of residual deformation of liquefied soil.3. Field investigation method called Geoslicer was used to find the trace of liquefaction induced flow failure during the 1964 Niigata earthquake.4. Change of the suction and water content of earth embankment were monitored for two years. From the data, the evaporation and the water retention characteristics were studied.5. Case study was conducted using the dynamic response analysis code developed.

填土和缓坡在主地震作用后发生的渐进延迟破坏正受到人们的关注。例如，在2003年三陆南地震和2003年宫城县北部地震期间，桑迪填土边坡像泥石流一样崩塌。孔隙水在破坏过程中起着重要作用，因为破坏土中含有大量的水，表现为泥状。本研究试图弄清这种失效的机理，并发展预测方法。认为振动产生的超静孔隙水压力起着重要的作用，超静孔隙水压力的传播是引起延迟破坏的原因。本研究的结果总结如下：1.提出了一种基于不排水循环剪切试验评价非饱和桑迪液化势的新思路，并得到了试验的证实。研究结果进一步阐明了非饱和土的液化机理.通过对循环不排水剪切试验后残余变形的分析，发现剪切变形与土的水粘性有关。这些结果适用于液化土残余变形的评价.利用Geoslicer方法对1964年新泻大地震中的液化流动破坏痕迹进行了现场调查.对土堤吸力和含水量的变化进行了两年的监测。根据实验数据，研究了蒸发和持水特性.使用开发的动力响应分析程序进行了算例分析。

项目成果

Hollow cylinder torsional tests on dilatancy characteristics of a sandy soil during seepage-induced shear failure

渗流剪切破坏过程中砂土剪胀特性的空心圆柱扭转试验

• 发表时间: 2004
• 作者: Kazama;M.
• 通讯作者: M.

Soil-water characteristic curve of volcanic sandy soil which caused mudflow tyre failure during the 2003 Sanriku-minami earthquake

2003年三陆南地震导致泥石流轮胎失效的火山砂土的土水特征曲线

• 发表时间: 2004
• 作者: Kazama;M.
• 通讯作者: M.

間隙水をゼリー状物質で置換された改良砂の液状化抵抗

胶状材料替代孔隙水改良砂的抗液化性能

• 发表时间: 2004
• 作者: T.Aoki;M.Kondo;K.Kurihara;N.Kamehara;M.Kuwabara;風間基樹
• 通讯作者: 風間基樹

Suction change of volcanic sandy soils with pumice due to vibration disturbance

振动扰动下浮石火山砂土吸力变化

• 发表时间: 2005
• 作者: Kazama;M.
• 通讯作者: M.

過去に盛土崩壊を起こした火山灰質砂質土の降雨時浸透特性

以往造成路堤塌陷的火山灰砂土降雨过程中渗流特征

• 发表时间: 2004
• 作者: 藤本健太郎;瀬川紘史;演田直之;平島岳夫;上杉英樹;祢津 紘司;風間基樹
• 通讯作者: 風間基樹