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Effect of transverse isotropy on compressive strengthsand elastic properties of bedded gypsum |
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| รหัสดีโอไอ | |
| Creator | 1. Laksikar Sitthimongkhol 2. Thanittha Thongprapha 3. Kiattisak Artkhonghan 4. Kittitep Fuenkajorn |
| Title | Effect of transverse isotropy on compressive strengthsand elastic properties of bedded gypsum |
| Publisher | Research and Development Office, Prince of Songkla University |
| Publication Year | 2565 |
| Journal Title | Songklanakarin Journal of Science an Technology (SJST) |
| Journal Vol. | 44 |
| Journal No. | 3 |
| Page no. | 803-810 |
| Keyword | confining pressure, bedding plane, Coulomb criterion, strain energy |
| URL Website | https://rdo.psu.ac.th/sjst/index.php |
| ISSN | 0125-3395 |
| Abstract | Compression tests have been performed on cylindrical specimens of bedded gypsum under confining pressures up to 15MPa. The specimens contain different bedding plane orientations. Results indicate that transverse isotropic effect occurs underall confinements where the strength is lowest when the normal to bedding planes makes an angle (๏ข) of 60๏ฐ with the core axis.The lowest modulus is obtained at ๏ข = 0๏ฐ, and the highest is at ๏ข = 90๏ฐ. Confining pressures rapidly increase the elastic and shearmoduli normal to bedding plane strike, toward those parallel to the beds. Loading gypsum under high confinement may induceplastic deformation by dislocation climb mechanism, which gradually tightens the microcracks and pore spaces along beddingplanes. Coulomb criterion is capable of describing the rock compressive strengths where the cohesion is defined as a polynomialfunction of ๏ข. Distortional strain energy induced at failure coincides with the results obtained from Coulomb criterion. |
