Transversely isotropic stiffness parameters and their measurement in Colorado shale
Drained stress path triaxial tests and confined torsion tests were conducted on Colorado shale core samples to investigate transversely isotropic stiffness parameters at small strain deformation. Nonlinear plastic behaviour occurred along the primary loading path even at strains less than 0.01%. Non...
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| Veröffentlicht in: | Canadian geotechnical journal 2006-12, Vol.43 (12), p.1290-1305 |
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| container_title | Canadian geotechnical journal |
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| creator | Gautam, Rajeeb Wong, Ron CK |
| description | Drained stress path triaxial tests and confined torsion tests were conducted on Colorado shale core samples to investigate transversely isotropic stiffness parameters at small strain deformation. Nonlinear plastic behaviour occurred along the primary loading path even at strains less than 0.01%. Nonlinear, hysteric behaviour was only observed during the loading-unloading path. However, the shale material displayed transverse isotropy in deformation, and very small or nondetectable Poisson's ratios in vertical and horizontal directions. This special response alludes to the postulate that the Colorado shale could be approximated by a transversely isotropic elasticity model at small strain levels with negligible yielding.Key words: anisotropy, elasticity, stiffness, triaxial test, torsion test, shale. |
| doi_str_mv | 10.1139/t06-083 |
| format | Article |
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Nonlinear plastic behaviour occurred along the primary loading path even at strains less than 0.01%. Nonlinear, hysteric behaviour was only observed during the loading-unloading path. However, the shale material displayed transverse isotropy in deformation, and very small or nondetectable Poisson's ratios in vertical and horizontal directions. This special response alludes to the postulate that the Colorado shale could be approximated by a transversely isotropic elasticity model at small strain levels with negligible yielding.Key words: anisotropy, elasticity, stiffness, triaxial test, torsion test, shale.</description><identifier>ISSN: 0008-3674</identifier><identifier>EISSN: 1208-6010</identifier><identifier>DOI: 10.1139/t06-083</identifier><identifier>CODEN: CGJOAH</identifier><language>eng</language><publisher>Ottawa, Canada: NRC Research Press</publisher><subject>Analysis ; Anisotropy ; Deformation ; Earth sciences ; Earth, ocean, space ; Elasticity ; Engineering and environment geology. 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Nonlinear plastic behaviour occurred along the primary loading path even at strains less than 0.01%. Nonlinear, hysteric behaviour was only observed during the loading-unloading path. However, the shale material displayed transverse isotropy in deformation, and very small or nondetectable Poisson's ratios in vertical and horizontal directions. This special response alludes to the postulate that the Colorado shale could be approximated by a transversely isotropic elasticity model at small strain levels with negligible yielding.Key words: anisotropy, elasticity, stiffness, triaxial test, torsion test, shale.</description><subject>Analysis</subject><subject>Anisotropy</subject><subject>Deformation</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Elasticity</subject><subject>Engineering and environment geology. Geothermics</subject><subject>Engineering geology</subject><subject>Exact sciences and technology</subject><subject>Isotropy</subject><subject>Materials elasticity</subject><subject>Mechanical properties</subject><subject>Plasticity</subject><subject>Poisson's ratio</subject><subject>Rocks</subject><subject>Shale</subject><subject>Shales</subject><subject>Strain</subject><subject>Stress state</subject><subject>Testing</subject><subject>Torsion</subject><issn>0008-3674</issn><issn>1208-6010</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNqV0m9r1TAUBvAiCl6n-BWK4EShM_-ati_HRedgKLj5OqTJyb0ZbdLltMN9ezPuhXllCtIXKeGXh-TwFMVrSk4o5d3HmciKtPxJsaKMtJUklDwtVoTkfy4b8bx4gXhNCBWCsVVxeZV0wFtICMNd6THOKU7elDh75wIglpNOeoQ5i1IHW85b8KkcQeOSYIQwlz6U6zjEpG0scasHeFk8c3pAeLVfj4ofnz9drb9UF9_OztenF5WuGzFXteHONbTn3PHeEEmdqYkmtGOdtVK0Te1Ebw30hlvJeguCQNPWVAJj3GrBj4rjXe6U4s0COKvRo4Fh0AHigop1XS0plRm--QNexyWFfDfFKOd1yzuSUbVDm_wE5YPLo9BmAwGSHmIA5_P2KZWkbQRn_CH0wJvJ36jf0ckjKH8WRm8eTX1_cCCbGX7OG70gqvPL7_9hvx7adztrUkRM4NSU_KjTnaJE3fdG5d6o3Jss3-6HpdHoweV-GI8PvM0jFV2b3YedC8kkQNDJbP8Revx3vEdqso7_Anjn2mE</recordid><startdate>20061201</startdate><enddate>20061201</enddate><creator>Gautam, Rajeeb</creator><creator>Wong, Ron CK</creator><general>NRC Research Press</general><general>National Research Council of Canada</general><general>Canadian Science Publishing NRC Research Press</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>ISN</scope><scope>ISR</scope><scope>3V.</scope><scope>7TG</scope><scope>7UA</scope><scope>7XB</scope><scope>88I</scope><scope>8AF</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>8FQ</scope><scope>8FV</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>FR3</scope><scope>GNUQQ</scope><scope>H96</scope><scope>HCIFZ</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L6V</scope><scope>M2P</scope><scope>M3G</scope><scope>M7S</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope><scope>Q9U</scope></search><sort><creationdate>20061201</creationdate><title>Transversely isotropic stiffness parameters and their measurement in Colorado shale</title><author>Gautam, Rajeeb ; Wong, Ron CK</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a574t-5c3ff71b33f3bc061fc50a01929dd64875f4bdcebc3d62bde40e78516e223da43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2006</creationdate><topic>Analysis</topic><topic>Anisotropy</topic><topic>Deformation</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Elasticity</topic><topic>Engineering and environment geology. 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Nonlinear plastic behaviour occurred along the primary loading path even at strains less than 0.01%. Nonlinear, hysteric behaviour was only observed during the loading-unloading path. However, the shale material displayed transverse isotropy in deformation, and very small or nondetectable Poisson's ratios in vertical and horizontal directions. This special response alludes to the postulate that the Colorado shale could be approximated by a transversely isotropic elasticity model at small strain levels with negligible yielding.Key words: anisotropy, elasticity, stiffness, triaxial test, torsion test, shale.</abstract><cop>Ottawa, Canada</cop><pub>NRC Research Press</pub><doi>10.1139/t06-083</doi><tpages>16</tpages></addata></record> |
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| source | NRC Research Press; Alma/SFX Local Collection |
| subjects | Analysis Anisotropy Deformation Earth sciences Earth, ocean, space Elasticity Engineering and environment geology. Geothermics Engineering geology Exact sciences and technology Isotropy Materials elasticity Mechanical properties Plasticity Poisson's ratio Rocks Shale Shales Strain Stress state Testing Torsion |
| title | Transversely isotropic stiffness parameters and their measurement in Colorado shale |
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