Evaluation of the State of Rocks in Load Steps by Low-frequency Ultrasonic Flaw Detection
dc.contributor.author | Kang, S | |
dc.contributor.author | Kim, J | |
dc.contributor.author | Noh, J | |
dc.contributor.author | Na, T | |
dc.contributor.author | Jang, Hyong Doo | |
dc.contributor.author | Ko, C | |
dc.date.accessioned | 2017-04-28T13:59:57Z | |
dc.date.available | 2017-04-28T13:59:57Z | |
dc.date.created | 2017-04-28T09:06:08Z | |
dc.date.issued | 2017 | |
dc.identifier.citation | Kang, S and Kim, J and Noh, J and Na, T and Jang, H.D. and Ko, C 2017. Evaluation of the State of Rocks in Load Steps by Low-frequency Ultrasonic Flaw Detection. The Journal of Engineering Geology. 27 (1): pp. 51-58. | |
dc.identifier.uri | http://hdl.handle.net/20.500.11937/52813 | |
dc.identifier.doi | 10.9720/kseg.2017.1.51 | |
dc.description.abstract |
The purpose of this study was to quantitatively evaluate the state of rocks in load steps by using the low-frequency ultrasonic flaw detection method. The initial Vp-velocities measured with a CND tester were in the order of Z-axis < X-axis < Y-axis, with 1687.5 m/s along the X-axis, 1690.7 m/s along the Y-axis, 1548.3 m/s along the Z-axis, and an average of 1642.2 m/s. The overall average of the Q vlaues, measured with a Silver Schmidt hammer, was 62.6, which corresponds to a uniaxial compressive strength of ~105 MPa. The Vp-velocity, measured with a low-frequency ultrasonic flaw detector at load steps of 50%, 60%, 70%, and 80%, typically decreases in the order of X-axis < Y-axis < Z-axis with increasing load steps. This order contrasts with that of the initial Vp-velocities. As the load step increases the factors that reduce the Vp-velocity in the X-axis direction are more influential than those in the Y-axis or Z-axis directions. This indicates that the initial state of rocks can vary and is dependent on the stress state. | |
dc.publisher | The Korean Society of Engineering Geology | |
dc.title | Evaluation of the State of Rocks in Load Steps by Low-frequency Ultrasonic Flaw Detection | |
dc.type | Journal Article | |
dcterms.source.volume | 27 | |
dcterms.source.number | 1 | |
dcterms.source.startPage | 51 | |
dcterms.source.endPage | 58 | |
dcterms.source.issn | 1226-5268 | |
dcterms.source.title | The Journal of Engineering Geology | |
curtin.department | Dept of Mining Eng & Metallurgical Eng | |
curtin.accessStatus | Open access via publisher | |
curtin.contributor.orcid | Jang, Hyong Doo [0000-0002-3978-5840] |