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Effect of stress path on shearing resistance of sandstone fractures |
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| รหัสดีโอไอ | |
| Creator | 1. Pakpoom Naphudsa 2. Thanittha Thongprapha 3. Kittitep Fuenkajorn |
| Title | Effect of stress path on shearing resistance of sandstone fractures |
| Publisher | Research and Development Office, Prince of Songkla University |
| Publication Year | 2563 |
| Journal Title | Songklanakarin Journal of Science and Technology |
| Journal Vol. | 42 |
| Journal No. | 2 |
| Page no. | 339-345 |
| Keyword | shear strength, strain energy density, Coulomb criterion, mean stress, triaxial test |
| URL Website | https://rdo.psu.ac.th/sjstweb/index.php |
| ISSN | 0125-3395 |
| Abstract | Triaxial and direct shear tests have been performed on rough (tension-induced) and smooth (saw-cut) fractures in PhraWihan sandstone specimens. Two stress paths are used for the triaxial shear testing: constant confining stress and constant meanstress. It is found that under low confinement both stress paths show similar shearing resistance for the rough fractures. Underhigh confinement, however, the strengths under constant mean stress are notably lower than those of constant confining stress.The shear strengths of smooth fractures are independent of the stress path. This is supported by the shear strength results obtainedfrom the direct shear testing, which suggests that under low normal stress and unconfined condition the stress path effect isinsignificant. It is postulated that fracture roughness and non-linear behavior of fracture wall rock under high confinements arethe main factors that cause stress path dependency of rock fractures. |
