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Progress and distribution of lateral displacement of rock specimen undre the triaxial compression test

三轴压缩试验中岩石试件侧向位移的进展及分布

基本信息

批准号：
08455485
负责人：
SATO Toshiaki
金额：
$ 4.54万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

Triaxial compression tests were conducted for Akiyoshi marble, Shirahama sandstone and Berea sandstone to discuss about the progress and the distribution of lateral displacement of the specimens. The measurements were conducted at the center of the specimens by using twelve displacement meters of cantilever type mounted around the specimen in every 30 degrees. First, the measured lateral displacement date were approximated by Fourier series and the lateral displacement was decomposed into four types of component. The were isotropoic displacement, anisotropic displacement, parallel movement and the displacement by the shearing along the generated fracture. From this analysis, it was cleared that the isotropic component was dominant until the apparent stress drop was observed and after that , the displacement according to the shearing was dominant when the specimen was brittle. On the other hand, when the specimen was plastic, the isotropic component was dominant all through the test. Mo … More reover, it was cleared that the component of parallel movement was sppeared from the start of the test and the anisotropic component started to appear just before or after the peak strength. Second, the maximun lateral displacement was calculated for all the rock types. From this analysis, it was cleared that in the case of Akiyioshi marble, the displacement generated by the isotropic component was larger than that by the shearing along generated fracture. In the case of Shirahama sandstone, it was cleared that the magnitude of the maximum lateral displacement genreated by the isotropic component was almost the same to that by the shearing. Furthermore, in the case of Berea sandstone, it was cleared that the maximum displacement was caused by the shearing. Last, the progress of inner failure of Akiyoshi marble was detected by using X-ray CT scanner and the relation between the lateral displacement and the inner failure of the specimen. From this analysis, it was detected that the inner failure became large according to the progress of axial strain and the direction of apparent fracture was perpendicular to the diectiron of dominant inner failure. Less

对Akiyoshi大理岩、Shirahama砂岩和Berea砂岩进行了三轴压缩试验，讨论了试件的侧向位移的进展和分布。在试件的中心用12个悬臂式位移计每30度安装在试件周围进行测量。首先，用傅里叶级数逼近实测的侧向位移数据，将侧向位移分解为四种分量。各向同性位移、各向异性位移、平行运动和沿生成裂缝的剪切位移。从这一分析中可以清楚地看出，在观察到表观应力降之前，各向同性分量占主导地位，之后，当试件脆性时，由剪切引起的位移占主导地位。另一方面，当试件为塑性试件时，各向同性成分在整个试验过程中占主导地位。Mo…此外，可以清楚地看到，平行运动的分量从测试开始就开始减少，而各向异性分量正好在峰值强度之前或之后开始出现。其次，计算了所有岩石类型的最大侧向位移。分析表明，在Akiyoshi大理岩的情况下，各向同性分量产生的位移大于沿产生的裂缝剪切产生的位移。以白滨砂岩为例，各向同性分量产生的最大侧向位移的大小与剪切作用产生的最大横向位移大小基本相同。此外，在贝里亚砂岩的情况下，清楚地表明最大位移是由剪切引起的。最后，利用X射线CT扫描仪检测了Akiyoshi大理岩的内部破坏过程以及试件的侧向位移与内部破坏的关系。分析发现，随着轴向应变的发展，内部破坏逐渐变大，且视断裂方向垂直于主要内部破坏方向。较少