| Project/Area Number |
07555330
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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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 | YAMAGUCHI UNIVERSITY |
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Principal Investigator |
ISHIDA Tsuyoshi Yamaguchi University, Center for Collaborative Research, Associate Professor, 地域共同研究開発センター, 助教授 (10232307)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Masahiro Nihon Public Co., Inc., Engineering Development, Senior Engineer, 技術開発部, 主任
MIZUTA Yoshiaki Yamaguchi University, Civil Engineering, Professor, 工学部, 教授 (20107733)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥10,700,000 (Direct Cost: ¥10,700,000)
Fiscal Year 1997: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1996: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1995: ¥8,000,000 (Direct Cost: ¥8,000,000)
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| Keywords | AE (Acoustic Emission) / Source Location / Hydraulic Fracturing / Stress Measurement / Borehole Sonde / Rock Mechanics |
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| Research Abstract |
In hydraulic fracturing for stress measurement, the direction of cracks due to fracturing follows the direction of the maximum compressive stress. To identify the direction, the sonde is usually removed after hydraulic fracturing, and then the other sonde is inserted into the borehole and traces of the cracks are obtained. Thus, this method takes a lot of time when a borehole becomes deep. To solve the problem, we get an idea to measure AE (Acoustic Emission) events accompanied with hydraulic fracturing and determine the crack direction. We developed a test sonde mounting four AE sensors in a cross section normal to the axis of the sonde. Using the sonde, the feasibility in determination of the crack direction is investigated. It is found that the sonde could be used practically with some improvements clarified from this investigation.
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