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Influence of Stress Larger than Preload but Acted for Shorter Duration in Tangent Modulus Method : A New Method to Measure In-situ Rock Stress
| Title: | Influence of Stress Larger than Preload but Acted for Shorter Duration in Tangent Modulus Method : A New Method to Measure In-situ Rock Stress |
| Authors: | Fujii, Y. Browse this author →KAKEN DB | | Kondo, K. Browse this author |
| Issue Date: | Oct-2010 |
| Publisher: | International Society for Rock Mechanics |
| Citation: | Advances in Rock Engineering, Proceedings. ISRM International Symposium 2010 and 6th Asian Rock Mechanics Symposium, Paper 35, 23-27 October, 2010, New Delhi, India |
| Abstract: | Influence of stress concentration at rock sampling on the in-situ rock stress value estimated by tangent modulus method, which is one of the oriented core methods for in-situ rock stress measurement, was experimentally investigated. Cylindrical specimens of Kimachi sandstone were preloaded at 30% UCS for 24 hour simulating in-situ stress and then a triangular shape-loading up to 40% UCS simulating stress concentration which took approx. 1 min. were carried out. Loading up to 50% UCS was applied to the specimen twice after certain delay time. Bending points were observed at 40% UCS for 0 to 1 hour delay time, at 30% UCS and 40% UCS for the 3 hour delay time, and at 30% UCS for 1 and 3 day delay time. The bending point was not observed for 1 week delay time. It is considered that the memory of concentrated stress acted at rock sampling for a short time can be lost and in-situ rock stress which acted for geological long-term can be accurately estimated if the test is carried out after an appropriate delay time. |
| Conference Name: | ISRM International Symposium 2010 and 6th Asian Rock Mechanics Symposium |
| Conference Place: | New Delhi |
| Rights: | Indian National Group of ISRM |
| Type: | proceedings (author version) |
| URI: | http://hdl.handle.net/2115/44221 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 藤井 義明
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