Study of shear bands and prediction of compaction and failure in the strain localization behavior of geomaterials

岩土材料应变局部化行为中的剪切带研究及压实和破坏预测

基本信息

  • 批准号:
    16360238
  • 负责人:
  • 金额:
    $ 9.47万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    2004
  • 资助国家:
    日本
  • 起止时间:
    2004 至 2006
  • 项目状态:
    已结题

项目摘要

ABSTRACT: Strain localization problems such as shear bands and slip surfaces are very important because those are precursor of failure. Hence many researchers have been studying for the last 30 years. On the other hand, compaction bands have been studied in recent years for the analysis of large settlement of off shore structures. In fact, experimental work on porous geomaterials has been done from 90s. A series of triaxial compression tests under the drained conditions was performed on diatomaceous porous rocks. A rectangular-shaped prismatic specimen was used to easily measure the strain distributions on the specimen surface. The distributions of local strain, i.e., shear strain, axial strain, and volumetric strain, were measured on the surface of the specimen by using an image analysis technique newly developed for this experiment. After the shear testing, the changes in density of the specimen were measured by an X-ray CT scanner. Some high density regions were found to correspond to the compaction bands observed in the image analysis in the cases of relatively high confining pressure levels. Then, we have carried out a numerical simulation of sensitive clay using an elasto-viscoplastic model with structural degradation based on the finite deformation theory, and we have found the compressive strain localization during the consolidation process. In addition, using the same model, numerical simulations of consolidation of soft clay and drained triaxial tests of diatomaceous mud stone have been carried out to study the compressive localization, namely, compaction bands and strain localization of geomaterials was discussed.
摘要:应变局部化问题,如剪切带和滑移面是破坏的前兆,非常重要。因此,许多研究人员在过去的30年里一直在研究。另一方面,近年来对压实带进行了研究,用于分析近海结构的大沉降。事实上,关于多孔岩土材料的实验工作从上世纪90年代就开始了。对硅藻质多孔岩石进行了排水条件下的三轴压缩试验。采用矩形柱形试样,方便地测量试样表面的应变分布。采用本实验新开发的图像分析技术,测量了试件表面的局部应变分布,即剪切应变、轴向应变和体积应变。剪切试验结束后,用x射线CT扫描仪测量试样的密度变化。在相对较高围压水平下,发现一些高密度区域与图像分析中观察到的压实带相对应。基于有限变形理论,采用考虑结构退化的弹粘塑性模型对敏感粘土进行了数值模拟,发现了其固结过程中的压应变局部化现象。此外,采用相同的模型,进行了软粘土固结数值模拟和硅藻质泥石排水三轴试验,研究了岩土材料的压缩局部化,即压实带和应变局部化。

项目成果

期刊论文数量(44)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Experimental study of compaction bands in diatomaceous porous rock
硅藻土多孔岩压实带实验研究
X線CTを用いた砂質土における圧縮帯の可視化
使用 X 射线 CT 可视化沙土中的压缩区域
Observation of strain localization of Noto diatomaceous mudstone by an image analysis and X ray
图像分析和X射线观察能登硅藻泥岩应变局部化
Three-dimensional Numerical Simulation of Strain Localization in Saturated Sand
饱和砂土中应变局域化的三维数值模拟
An elasto-visoplastic model for clay considering destructuralization and prediction of compaction bands
考虑解构和压实带预测的粘土弹粘塑性模型
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OKA Fusao其他文献

OKA Fusao的其他文献

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{{ truncateString('OKA Fusao', 18)}}的其他基金

Deformation and failure mechanism of levee on the soft clay deposit during great earthquakes and reinforcement method
软粘土沉积物堤坝大震变形破坏机理及加固方法
  • 批准号:
    24560605
  • 财政年份:
    2012
  • 资助金额:
    $ 9.47万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
3-D LIQUEFACTION ANALYSIS CONSIDERING A LARGE DEFORMATION
考虑大变形的 3-D 液化分析
  • 批准号:
    11694147
  • 财政年份:
    1999
  • 资助金额:
    $ 9.47万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Cyclic behavior of clay during great earthquake and its consititutive model
大震过程中粘土的循环行为及其本构模型
  • 批准号:
    09650545
  • 财政年份:
    1997
  • 资助金额:
    $ 9.47万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
PROGRESSIVE FAILURE OF GEO-STRUCTURE AND STRAIN LOCALIZATION
地质结构和应变定位的逐渐失效
  • 批准号:
    07305018
  • 财政年份:
    1995
  • 资助金额:
    $ 9.47万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Study on the Strain localization behavior of water-saturated clay and the method of prediction
饱和水粘土应变局部化行为及预测方法研究
  • 批准号:
    07650568
  • 财政年份:
    1995
  • 资助金额:
    $ 9.47万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Cyclic and anisotropic elasto-viscoplastic behavior of clay and constitutive model
粘土的循环和各向异性弹粘塑性行为及本构模型
  • 批准号:
    04650434
  • 财政年份:
    1992
  • 资助金额:
    $ 9.47万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
Elasto-Viscoplastic constitutive model for natural clay and its application
天然粘土弹粘塑性本构模型及其应用
  • 批准号:
    01550382
  • 财政年份:
    1989
  • 资助金额:
    $ 9.47万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)

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脆韧转变时的应变局部化过程:中上地壳的研究
  • 批准号:
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Strain Localization in Composite Inks and its Effect on Electrical Behavior under Monotonic and Cyclic Stretching
复合油墨中的应变局域化及其对单调和循环拉伸下电行为的影响
  • 批准号:
    2026936
  • 财政年份:
    2020
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    $ 9.47万
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Strain localization processes at the brittle-ductile transition: an investigation of the mid-to-upper crust
脆韧转变时的应变局部化过程:中上地壳的研究
  • 批准号:
    535263-2019
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strain localization promoted by dynamic recrystallization of orthopyroxene studied by high-pressure deformation experiments
高压变形实验研究斜方辉石动态再结晶促进的应变局部化
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RUI:Collaborative Research: Fluid flow metamorphism and strain localization in mid-crustal shear zones
RUI:合作研究:中地壳剪切带的流体流动变质作用和应变局部化
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评估裂谷演化过程中应变局部化与岩浆作用之间的关系
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IRES Track I:南伊比利亚剪切带变沉积岩应变局部化的岩性控制
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应变局部化过程、纹理发展和自然变形下地壳流变学的现场和微观结构研究
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