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Size Effects in a Transversely Isotropic Rock Under Brazilian Tests: Laboratory Testing
Rock Mechanics and Rock Engineering ( IF 5.5 ) Pub Date : 2020-02-13 , DOI: 10.1007/s00603-020-02058-7
Kaihui Li , Yungming Cheng , Zhen-Yu Yin , Dongya Han , Jingjing Meng

A transversely isotropic rock, slate, was utilized to investigate the size effect and anisotropy on its deformation, tensile strength, and failure mechanism. A series of Brazilian tests were conducted on slate samples of six different sizes from 25 to 100 mm in diameter at seven different loading-foliation angles from 0° to 90°. The results indicate that the Young’s modulus in the plane of transverse isotropy increases, while the Young’s modulus and shear modulus perpendicular to the plane of transverse isotropy decrease with specimen size. The tensile strength of the slate increases with increasing loading-foliation angle, the variation of which is well captured by the Nova–Zaninetti criterion. Furthermore, the tensile strength of the slate increases with specimen size at loading-foliation angles from 0° to 45°, while it increases first and then decreases with specimen size at loading-foliation angles from 60° to 90°. A unified size-effect relation including two equations is proposed and verified against the experimental data on slate. The size-effect relation reveals the relationship among the tensile strength, specimen size, and loading-foliation angle for the transversely isotropic rock. Finally, the slate samples exhibit an increased brittle failure with specimen size, which is consistent with the observations in various isotropic rocks. It is also found that the specimen size, loading-foliation angle, and loading configuration together control the failure mechanism of transversely isotropic rocks in the Brazilian test.

中文翻译:

巴西测试下横向各向同性岩石的尺寸效应:实验室测试

横向各向同性岩石板岩被用来研究尺寸效应和各向异性对其变形、抗拉强度和破坏机制的影响。在 0° 至 90° 的七个不同加载叶理角下,对直径为 25 至 100 毫米的六种不同尺寸的板岩样品进行了一系列巴西测试。结果表明,随着试样尺寸的增加,横向各向同性平面内的杨氏模量增加,而垂直于横向各向同性平面的杨氏模量和剪切模量减小。板岩的抗拉强度随着加载-叶理角的增加而增加,Nova-Zaninetti 准则很好地捕捉到了其变化。此外,板岩的抗拉强度在加载-叶理角从 0° 到 45° 时随着试样尺寸的增加而增加,而在加载叶理角从 60° 到 90° 时,它随着试样尺寸的增加先增加后减小。提出了一个包括两个方程的统一尺寸效应关系,并根据板岩上的实验数据进行了验证。尺寸效应关系揭示了横向各向同性岩石的抗拉强度、试样尺寸和加载-叶理角之间的关系。最后,板岩样品的脆性破坏随试样尺寸的增加而增加,这与在各种各向同性岩石中的观察结果一致。还发现试样尺寸、加载叶理角和加载配置共同控制了巴西试验中横向各向同性岩石的破坏机制。提出了一个包括两个方程的统一尺寸效应关系,并根据板岩上的实验数据进行了验证。尺寸效应关系揭示了横向各向同性岩石的抗拉强度、试样尺寸和加载-叶理角之间的关系。最后,板岩样品的脆性破坏随试样尺寸的增加而增加,这与在各种各向同性岩石中的观察结果一致。还发现试样尺寸、加载叶理角和加载配置共同控制了巴西试验中横向各向同性岩石的破坏机制。提出了一个包括两个方程的统一尺寸效应关系,并根据板岩上的实验数据进行了验证。尺寸效应关系揭示了横向各向同性岩石的抗拉强度、试样尺寸和加载-叶理角之间的关系。最后,板岩样品的脆性破坏随试样尺寸的增加而增加,这与在各种各向同性岩石中的观察结果一致。还发现试样尺寸、加载叶理角和加载配置共同控制了巴西试验中横向各向同性岩石的破坏机制。板岩样品的脆性破坏随样品尺寸的增加而增加,这与在各种各向同性岩石中的观察结果一致。还发现试样尺寸、加载叶理角和加载配置共同控制了巴西试验中横向各向同性岩石的破坏机制。板岩样品的脆性破坏随样品尺寸的增加而增加,这与在各种各向同性岩石中的观察结果一致。还发现试样尺寸、加载叶理角和加载配置共同控制了巴西试验中横向各向同性岩石的破坏机制。
更新日期:2020-02-13
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