| A modi?ed failure criterion for transversely isotropic rocks |
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| 摘 要： | A modified failure criterion is proposed to determine the strength of transversely isotropic rocks. Me-chanical properties of some metamorphic and sedimentary rocks including gneiss, slate, marble, schist, shale, sandstone and limestone, which show transversely isotropic behavior, were taken into consider-ation. Afterward, introduced triaxial rock strength criterion was modified for transversely isotropic rocks. Through modification process an index was obtained that can be considered as a strength reduction parameter due to rock strength anisotropy. Comparison of the parameter with previous anisotropy in-dexes in literature showed reasonable results for the studied rock samples. The modified criterion was compared to modified Hoek-Brown and Ramamurthy criteria for different transversely isotropic rocks. It can be concluded that the modified failure criterion proposed in this study can be used for predicting the strength of transversely isotropic rocks.
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| 关 键 词： | 岩石强度准则 横观各向同性 破坏准则 强度各向异性 机械性能 强度降低 岩石样本 修改 |
| 收稿时间： | 17 January 2013 |
http://www.sciencedirect.com/science/article/pii/S1674987113000819 |
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| Authors: | Omid Saeidi Vamegh Rasouli Rashid Geranmayeh Vaneghi Raoof Gholami Seyed Rahman Torabi |
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| Affiliation: | [1] Faculty of Mining, Petroleum and Geophysics, Shahrood University of Technology, Shahrood, Iran [2] Department of Petroleum Engineering, Curtin University, Perth, Australia [3] Rock Mechanics Division, Tarbiat Modares University, Tehran, Iran [4] Department of Chemical and Petroleum Engineering, Curtin University of Technology, Sarawak, Malaysia |
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| Abstract: | A modified failure criterion is proposed to determine the strength of transversely isotropic rocks. Mechanical properties of some metamorphic and sedimentary rocks including gneiss, slate, marble, schist, shale, sandstone and limestone, which show transversely isotropic behavior, were taken into consideration. Afterward, introduced triaxial rock strength criterion was modified for transversely isotropic rocks. Through modification process an index was obtained that can be considered as a strength reduction parameter due to rock strength anisotropy. Comparison of the parameter with previous anisotropy indexes in literature showed reasonable results for the studied rock samples. The modified criterion was compared to modified Hoek-Brown and Ramamurthy criteria for different transversely isotropic rocks. It can be concluded that the modified failure criterion proposed in this study can be used for predicting the strength of transversely isotropic rocks. |
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| Keywords: | Transversely isotropic rock Strength anisotropy Failure criterion Triaxial test |
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