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Herbert H. Einstein and Andrew Whittle. Pei, Jianyong, 1975- Massachusetts Institute of Technology. Dept. of Civil and Environmental Engineering. Massachusetts Institute of Technology. Department of Civil and Environmental Engineering 2008-12-11T18:50:12Z 2008-12-11T18:50:12Z 2008 2008 http://hdl.handle.net/1721.1/43910 263936647 Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2008. Includes bibliographical references (p. 253-259). This thesis proposes a new Anisotropic Matsuoka-Nakai (AMN) criterion to characterize the failure of transversely isotropic rocks under true triaxial stress states. One major obstacle in formulating an anisotropic criterion is that it usually involves six stress components, instead of three principal stresses. As such, anisotropic criteria usually lead to complicated mathematical expressions, and cannot be directly visualized in three-dimensional space. This problem is solved by introducing the Material Normal Stress System (MNSS), which is the space formed by the three normal stress components reflecting the material anisotropy. Within this system, the failure behavior of transversely isotropic rocks in conventional triaxial tests can be represented with geometrical features in the MNSS. These features are then incorporated into the failure surface of the original Matsuoka-Nakai criterion in the Material Normal Stress System, resulting in the Anisotropic Matsuoka-Nakai criterion. This criterion, combined with the Coulomb criterion, is validated against both conventional and true triaxial test data, that are collected from an extensive literature review. The combination of the AMN criterion and the Coulomb criterion satisfactorily characterizes the measured strength from an extensive program of true triaxial tests on a schist, which confirms the ability of the proposed criterion. Finally, this combination of criteria is applied to the borehole stability problem. The necessary mud pressure against borehole collapse and the onset of borehole failure are examined. by Jianyong Pei. Ph.D. 339 p. eng Massachusetts Institute of Technology M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Civil and Environmental Engineering. Strength of transversely isotropic rocks Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="efcc32a1-d7b9-4704-b0ac-51759bba6d6a"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Strength of transversely isotropic rocks</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2008</PublicationDate> <Authors> <Author> <DisplayName>Pei, Jianyong, 1975-</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Civil and Environmental Engineering.</Keyword> <Abstract>This thesis proposes a new Anisotropic Matsuoka-Nakai (AMN) criterion to characterize the failure of transversely isotropic rocks under true triaxial stress states. One major obstacle in formulating an anisotropic criterion is that it usually involves six stress components, instead of three principal stresses. As such, anisotropic criteria usually lead to complicated mathematical expressions, and cannot be directly visualized in three-dimensional space. This problem is solved by introducing the Material Normal Stress System (MNSS), which is the space formed by the three normal stress components reflecting the material anisotropy. Within this system, the failure behavior of transversely isotropic rocks in conventional triaxial tests can be represented with geometrical features in the MNSS. These features are then incorporated into the failure surface of the original Matsuoka-Nakai criterion in the Material Normal Stress System, resulting in the Anisotropic Matsuoka-Nakai criterion. This criterion, combined with the Coulomb criterion, is validated against both conventional and true triaxial test data, that are collected from an extensive literature review. The combination of the AMN criterion and the Coulomb criterion satisfactorily characterizes the measured strength from an extensive program of true triaxial tests on a schist, which confirms the ability of the proposed criterion. Finally, this combination of criteria is applied to the borehole stability problem. The necessary mud pressure against borehole collapse and the onset of borehole failure are examined.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>