1998 Fiscal Year Final Research Report Summary
Development of the borehole television system using the fluorescent technique
| Project/Area Number |
09555320
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
資源開発工学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
NISHIYAMA Takashi Faculty of Energy Science, Kyoto University, Professor, エネルギー科学研究科, 教授 (70026227)
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| Co-Investigator(Kenkyū-buntansha) |
CHEN Youqing Faculty of Energy Science, Kyoto University, Research Associate, エネルギー科学研究科, 助手 (80293926)
KUSUDA Hiromu Faculty of Energy Science, Kyoto University, Associate Professor, エネルギー科学研究科, 助教授 (90169988)
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| Project Period (FY) |
1997 – 1998
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| Keywords | fluorescent technique / borehole television system / image processing / microcrack / ultraviolet light / boring / grouting |
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| Research Abstract |
It is very difficult to identify microcracks using conventional borehole television systems, because there are no characteristic differences in microcracks from other materials of rocks. Therefore, we applied the fluorescent technique, which is widely used to examine microcracks and pore spaces under a microscope for the borehole television system.
A new circular ultraviolet lamp was designed to observe microcracks inside boreholes. Many hidden microcracks that were not recognized by a conventional borehole television were disclosed under ultraviolet light, in the laboratory setting. The fluorescent approach was performed for visualization of grouting processes. The distributions of various grout mixtures containing fluorescent substances were clearly visualized under ultraviolet light, using a borehole television system.
Two field tests, evaluation of a loosened zone in a rock mass caused by widening of the Maiko Tunnel in Hyogo prefecture and analysis of grouting mechanisms in the limb tunnel of Yokotake Dam in Kyushu, were carried out. Formation of new microcracks and/or progression of microcracks inside boreholes were observed after widening of the tunnels. Many microcracks filled with grout mixed with three different coloring substances were clearly visualized under ultraviolet light using this system.
It is concluded that the borehole television system combined with the fluorescent technique has been successfully developed and is very useful for identification of microcracks or grout containing fluorescent substances inside horeholes.
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