Non-axisymmetric and/or non-elementary response of anisotropic tuff in axisymmetric, elementary triaxial test
Non-axisymmetric and/or non-elementary response of anisotropic tuff in axisymmetric, elementary triaxial test
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轴对称基本三轴试验中各向异性凝灰岩的非轴对称和/或非基本响应
DOI：
10.1051/e3sconf/20199202008
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发表时间：
2019
影响因子：
--
通讯作者：
K. Ogawa
中科院分区：
文献类型：
--
作者：
Y. Togashi;M. Kikumoto;K. Tani;Koichi Hosoda;K. Ogawa
三轴试验的试件通常在轴对称条件下作为单元响应，这在理论上是正确的假设。然而，对于各向异性岩石，并不总是满足轴对称条件，因为应力和应变之间的增量关系不是同轴的。此外，此类岩石样本经常因端部摩擦而表现出不均匀的变形行为。因此，端部约束对各向异性岩石三轴压缩变形行为的影响远大于各向同性岩石。在这项研究中，研究了由于端部约束条件引起的各向异性凝灰岩应力-应变关系的变化。四次应变张量固结排水三轴试验结果表明，试件端部是否安装滑动机构和聚四氟乙烯片对轴向应变和体积应变没有影响；同时，由于端部约束，应变张量的剪切分量和主应变方向的倾角变化很大。
Specimens of triaxial tests ordinarily response as element in the axisymmetric condition, and it is theoretically correct assumption. However, for anisotropic rocks, the axisymmetric condition is not always satisfied because incremental relationships between stresses and strains are not coaxial. In addition, such rock specimen often shows non-uniform deformation behaviors due to end frictions. As the reason, the influence of end restraints on deformation behaviors of anisotropic rocks during triaxial compression is much greater than that of isotropic one. In this study, the variations in the stress-strain relationships of anisotropic tuff due to the condition of end restraints are investigated. The results of four consolidated drained triaxial tests with measuring the strain tensor demonstrated that the axial and volumetric strains were not influenced by whether sliding mechanism and Teflon sheets are installed at the end of specimens or not; meanwhile, the shear components of the strain tensor and the inclinations of principal strain orientations are widely varied owing to the end restraints.