Effect of transverse isotropy on compressive strengths and elastic properties of bedded gypsum
Compression tests have been performed on cylindrical specimens of bedded gypsum under confining pressures up to 15 MPa. The specimens contain different bedding plane orientations. Results indicate that transverse isotropic effect occurs under all confinements where the strength is lowest when the...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Prince of Songkla University
2022-06-01
|
| Series: | Songklanakarin Journal of Science and Technology (SJST) |
| Subjects: | |
| Online Access: | https://sjst.psu.ac.th/journal/44-3/27.pdf |
| _version_ | 1797848970424221696 |
|---|---|
| author | Laksikar Sitthimongkhol Thanittha Thongprapha Kiattisak Artkhonghan Kittitep Fuenkajorn |
| author_facet | Laksikar Sitthimongkhol Thanittha Thongprapha Kiattisak Artkhonghan Kittitep Fuenkajorn |
| author_sort | Laksikar Sitthimongkhol |
| collection | DOAJ |
| description | Compression tests have been performed on cylindrical specimens of bedded gypsum under confining pressures up to 15
MPa. The specimens contain different bedding plane orientations. Results indicate that transverse isotropic effect occurs under
all confinements where the strength is lowest when the normal to bedding planes makes an angle () of 60 with the core axis.
The lowest modulus is obtained at = 0, and the highest is at = 90. Confining pressures rapidly increase the elastic and shear
moduli normal to bedding plane strike, toward those parallel to the beds. Loading gypsum under high confinement may induce
plastic deformation by dislocation climb mechanism, which gradually tightens the microcracks and pore spaces along bedding
planes. Coulomb criterion is capable of describing the rock compressive strengths where the cohesion is defined as a polynomial
function of . Distortional strain energy induced at failure coincides with the results obtained from Coulomb criterion.
|
| first_indexed | 2024-04-09T18:37:18Z |
| format | Article |
| id | doaj.art-58e76acf68b64eb9871970d0f92c9a06 |
| institution | Directory Open Access Journal |
| issn | 0125-3395 |
| language | English |
| last_indexed | 2024-04-09T18:37:18Z |
| publishDate | 2022-06-01 |
| publisher | Prince of Songkla University |
| record_format | Article |
| series | Songklanakarin Journal of Science and Technology (SJST) |
| spelling | doaj.art-58e76acf68b64eb9871970d0f92c9a062023-04-11T08:35:22ZengPrince of Songkla UniversitySongklanakarin Journal of Science and Technology (SJST)0125-33952022-06-0144380381010.14456/sjst-psu.2022.108Effect of transverse isotropy on compressive strengths and elastic properties of bedded gypsumLaksikar Sitthimongkhol0Thanittha Thongprapha1Kiattisak Artkhonghan2Kittitep Fuenkajorn3Geomechanics Research Unit, Institute of Engineering, Suranaree University of Technology, Mueang, Nakhon Ratchasima, 30000 ThailandGeomechanics Research Unit, Institute of Engineering, Suranaree University of Technology, Mueang, Nakhon Ratchasima, 30000 ThailandGeomechanics Research Unit, Institute of Engineering, Suranaree University of Technology, Mueang, Nakhon Ratchasima, 30000 ThailandGeomechanics Research Unit, Institute of Engineering, Suranaree University of Technology, Mueang, Nakhon Ratchasima, 30000 ThailandCompression tests have been performed on cylindrical specimens of bedded gypsum under confining pressures up to 15 MPa. The specimens contain different bedding plane orientations. Results indicate that transverse isotropic effect occurs under all confinements where the strength is lowest when the normal to bedding planes makes an angle () of 60 with the core axis. The lowest modulus is obtained at = 0, and the highest is at = 90. Confining pressures rapidly increase the elastic and shear moduli normal to bedding plane strike, toward those parallel to the beds. Loading gypsum under high confinement may induce plastic deformation by dislocation climb mechanism, which gradually tightens the microcracks and pore spaces along bedding planes. Coulomb criterion is capable of describing the rock compressive strengths where the cohesion is defined as a polynomial function of . Distortional strain energy induced at failure coincides with the results obtained from Coulomb criterion. https://sjst.psu.ac.th/journal/44-3/27.pdfconfining pressurebedding planecoulomb criterionstrain energy |
| spellingShingle | Laksikar Sitthimongkhol Thanittha Thongprapha Kiattisak Artkhonghan Kittitep Fuenkajorn Effect of transverse isotropy on compressive strengths and elastic properties of bedded gypsum Songklanakarin Journal of Science and Technology (SJST) confining pressure bedding plane coulomb criterion strain energy |
| title | Effect of transverse isotropy on compressive strengths and elastic properties of bedded gypsum |
| title_full | Effect of transverse isotropy on compressive strengths and elastic properties of bedded gypsum |
| title_fullStr | Effect of transverse isotropy on compressive strengths and elastic properties of bedded gypsum |
| title_full_unstemmed | Effect of transverse isotropy on compressive strengths and elastic properties of bedded gypsum |
| title_short | Effect of transverse isotropy on compressive strengths and elastic properties of bedded gypsum |
| title_sort | effect of transverse isotropy on compressive strengths and elastic properties of bedded gypsum |
| topic | confining pressure bedding plane coulomb criterion strain energy |
| url | https://sjst.psu.ac.th/journal/44-3/27.pdf |
| work_keys_str_mv | AT laksikarsitthimongkhol effectoftransverseisotropyoncompressivestrengthsandelasticpropertiesofbeddedgypsum AT thanitthathongprapha effectoftransverseisotropyoncompressivestrengthsandelasticpropertiesofbeddedgypsum AT kiattisakartkhonghan effectoftransverseisotropyoncompressivestrengthsandelasticpropertiesofbeddedgypsum AT kittitepfuenkajorn effectoftransverseisotropyoncompressivestrengthsandelasticpropertiesofbeddedgypsum |