Determination of 12 orthotropic elastic constants for rocks
Determination of 12 orthotropic elastic constants for rocks
复制标题
岩石 12 个正交各向异性弹性常数的测定
DOI：
10.1016/j.ijrmms.2021.104889
复制
发表时间：
2021
影响因子：
7.2
通讯作者：
K. Ogawa
中科院分区：
文献类型：
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作者：
Y. Togashi;M. Kikumoto;K. Tani;Koichi Hosoda;K. Ogawa
岩石的变形性质最终取决于矿物颗粒的取向和沉积构造的各向异性。变形各向异性的表征对于准确理解岩石内部构造（如岩石地基和隧道）的变形特征具有重要意义。横向各向同性弹性是最简单的各向异性弹性模型，近年来，人们提出了许多合理确定该弹性常数的方法。虽然描述变形各向异性的最一般的线性弹性模型是正交各向异性弹性模型，但由于模型描述所需的弹性常数数量非常大，目前尚无确定正交各向异性弹性常数的有效方法。考虑在施工现场的应用，并结合含水率差异等其他现象，需要合理的正交各向异性弹性确定方法。本文提出了一种新的方法，通过三次正交的单轴压缩试验，获得试件的全部12个正交各向异性弹性常数。对每个试件进行应变张量测量，并对弹性区的应变进行相加和分析，确定正交各向异性弹性的主取向。然后，利用每个试件的应力-应变关系确定了9个弹性常数。本文描述了方法。根据新近系软质沉积岩的验证实验结果，对该方法的有效性进行了评价。
The deformation properties of rocks ultimately become anisotropic depending on the orientations of mineral particles and sedimentary structures. Characterization of deformation anisotropy is important for accurate understanding of the deformation characteristics of structures constructed inside rocks (e.g., rock foundation and tunnel). The simplest anisotropic elastic model is transversely isotropic elasticity, and in recent years, many methods for rationally specifying this elastic constant have been proposed.Although the most general linear elastic model for describing deformation anisotropy is orthotropic elasticity, no efficient method currently exists for determining the orthotropic elastic constants because the number of elastic constants required for the model description is extremely large. A rational determination method for orthotropic elasticity is necessary when considering application at construction sites and coupling with other phenomena such as differences in water content. In this study, a new method was developed for obtaining all 12 constants of orthotropic elasticity by three uniaxial compression tests on specimens sampled in three directions orthogonal to each other. For each specimen, the strain tensor was measured, and the strains in the elastic region were added and analyzed to identify the principal orientation of orthotropic elasticity. Thereafter, nine elastic constants are specified using the stress–strain relationship of each specimen. The methodology is described herein. The validity of the proposed method was evaluated on the basis of results from verification experiments performed with Neogene soft sedimentary rocks.
含水量连续变化引起的各向异性凝灰岩的主应变旋转
DOI：
10.1016/j.ijrmms.2021.104646
发表时间：
2021
影响因子：
7.2
作者：
Togashi Yota;Imano Takanobu;Osada Masahiko;Hosoda Koichi;Ogawa Koji
通讯作者：
Ogawa Koji
润湿过程中含水率连续变化引起的沉积岩变形特征
DOI：
--
发表时间：
2021
期刊：
影响因子：
--
作者：
Togashi Y.;Imano T. & Osada M.
通讯作者：
Imano T. & Osada M.