2007 Fiscal Year Final Research Report Summary
Establishment of shear-flow coupling test and GIS numerical model of rock joint
| Project/Area Number |
17360433
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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 | 一般 |
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| Research Field |
Earth system and resources enginnering
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| Research Institution | Kyushu University |
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Principal Investigator |
ESAKI Tetsuro Kyushu University, Faculty of Engineering, Professor (40038609)
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| Co-Investigator(Kenkyū-buntansha) |
JIANG Yujing Nagasaki University, Faculty of Engineering, Associate Professor (50253498)
MITANI Yasuhiro KYUSHU UNIVERSITY, Faculty of Engineering, Associate Professor (20301343)
IKEMI Hiroaki KYUSHU UNIVERSITY, Faculty of Engineering, Assistant Professor (90380576)
ZHANG Mei KYUSHU UNIVERSITY, Advanced Industrial Science and Technology, Chief Researcher (30357503)
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| Project Period (FY) |
2005 – 2007
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| Keywords | Rock Engineering / Shear-Flow Coupling / GIS Numerical Model / Discontinuity of Rock / Laboratory Shear Test |
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| Research Abstract |
1. Shear-flow testing apparatus of rock joint has been developed and accomplished for its procedure of operation. By controlling the two jacks, normal stress is applied under shearing despite the irregular rock joint shape. The coupling test is conducted by allowing water to flow through the injection hole of the lower specimen.
2. By using the apparatus developed, the normal stress control test and the normal displacement control test that is the keeping of parallel condition of discontinuities, has been successfully accomplished with permeability test simultaneously. The water is then allowed to flow out to the edge through an aperture. After flowing over the labyrinth gate, water flow rate is automatically measured. At a normal stress of 0.3MPa, the peak shear is clearly shown, but at other normal stress stages, it does not appear. It also shows that with increasing the normal stress, residual shear stress increases. The dilation occurred until 0.6MPa of normal stress. After that, the normal displacement is gradually decreasing. At a normal stress of 0.3MPa, the hydraulic conductivity rapidly increases to about 2 orders of magnitude with increasing shear displacement.
3. 3D asperities of discontinuities has been measured by laser profile apparatus and presented the 3D discontinuity distribution map during shear-flow coupling test. The simulation of shear-flow coupling process of rock joint is faithfully carried out and gotten the characteristics of the behavior of joint.
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[Journal Article] Proposal of testing method of shear-flow coupling of natural rock Joint2008
Author(s)
Y., Mitani, M., Shimoda, T., Esaki, H., Ikemi, Y., Yamagami
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Journal Title
Proceedings of the 37th Rock Mechanics Symposium, Japan
Pages: 385-390
Description
「研究成果報告書概要(欧文)」より
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