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Visualization and sequence photo of tertiary creep under confining pressure

围压下三次蠕变的可视化和序列照片

基本信息

批准号：
15360473
负责人：
OKUBO Seisuke
金额：
$ 4.42万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15360473/
关键词：
Visualization Sequence Photo Rock Creep Tri-Axial Compression Test Confining Pressure Visco-Elasticity Constitutive Equation

项目摘要

It is essential for underground development to understand the failure process of rock subjected to tri-axial compression. Therefore, we developed a transparent tri-axial vessel made of an acrylic acid resin, and succeeded in observing the failure process of rock specimens in tri-axial compression test. In this study, tri-axial creep tests of Tage tuff were also conducted within the transparent vessel.A creep test usually requires longer time than a compression test and it is not feasible to take a photograph continuously at every predetermined time interval. Therefore, in this study, the photographing system was developed which cooperated with the existing loading and measuring apparatuses. This system made it possible to take a series of photographs of a specimen in the tertiary creep region. Photographs taken in a tri-axial test were processed to obtain axial and lateral deformations by the computer program developed in this study.After careful examination of axial and lateral deformations, it was found that the creep strain (axial strain) just before failure was nearly equal to the cross sectional width of the stress-strain curve at the creep stress level, and that not only axial but also lateral strain-rates in the tertiary creep region were inversely proportional to the residual time up to the failure. And it was also found that ratio of the lateral and axial strain increases in the tertiary creep region were similar to those of the tri-axial compression test just after the strength failure point.

了解岩石在三轴压缩作用下的破坏过程对地下开发具有重要意义。因此，我们研制了一种丙烯酸树脂制成的透明三轴容器，并成功地观察了岩石试件在三轴压缩试验中的破坏过程。本研究还在透明容器内进行了Tage凝灰岩的三轴蠕变试验。蠕变试验通常需要比压缩试验更长的时间，并且在每个预定的时间间隔连续拍摄照片是不可行的。因此，在本研究中，开发了与现有加载和测量设备相配合的拍摄系统。该系统使在第三系蠕变区拍摄标本的一系列照片成为可能。在三轴试验中拍摄的照片通过本研究中开发的计算机程序进行处理以获得轴向和横向变形。通过对轴向和侧向变形的仔细检查，发现破坏前的蠕变应变（轴向应变）几乎等于蠕变应力水平下应力-应变曲线的横截面宽度，并且三级蠕变区域的轴向应变率和侧向应变率与破坏前的残余时间成反比。三级蠕变区侧向应变与轴向应变的增量比与三轴压缩试验的强度破坏点后的增量比相似。