2004 Fiscal Year Final Research Report Summary
Investigation and modeling of mechanical characteristics of non-uniform and discontinuous rock mass in deep ground by in-situ triaxial tests
| Project/Area Number |
13355021
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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 |
Geotechnical engineering
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| Research Institution | National University Corporation Yokohama National University |
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Principal Investigator |
TANI Kazuo Yokohama National University, Faculty of Engineering, Professor, 大学院・工学研究院, 教授 (50313466)
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| Co-Investigator(Kenkyū-buntansha) |
OKADA Tetsuji CRIEPI, Earth Eng.Res.Center, Senior Principal Researcher, 地球工学研究所・バックエンド研究センター, 主任研究員
KANEKO Susumu Kiso-Jiban Consultant Ltd., Principal Research Engineer, 技術開発部, 主席調査技師
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| Project Period (FY) |
2001 – 2004
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| Keywords | Rock mass / In-situ test / Strength / Deformation / Investigation |
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| Research Abstract |
In-situ triaxial test method was invented in 1998 for the purpose to measure average stress and strain relationships of rock masses. Since the test specimens are prepared in the ground by rotary drilling, disturbance of the ground is expected to be as practically minimal.
In the fiscal year 2001,the advanced version of the test method was devised using CCD for deformation measuring system. This system was expected to allow measurement of strain distribution throughout the test specimen, thus believed to be useful for studying non-uniform or discontinuous rock mass behavior.
In the fiscal year 2002,uniaxial as well as triaxial compression devices were developed introducing this CCD measuring system. Furthermore, multi-step loading triaxial test method was investigated to reduce the number of test specimens and to avoid the difficulties of interpreting scattered data.
In the fiscal year 2003, a couple of triaxial tests were conducted with CCD measurement using artificial rock specimens. The results demonstrated that the deformation of specimens became progressively localized as the axial compression proceeded. Moreover, test equipment for the field test was improved. The accuracy and speed of deformation measurement were enhanced as ten-fold as the previous version. Selection of site was also made for the field tests and preliminary geological investigation was conducted
In the fiscal year 2004,a series of field tests were carried out at the site of tuff breccia. Average stress and strain relationships were measured for typically non-uniform rock masses. Some laboratory triaxial tests were also done to obtain the complimentary data to study scale effect and some other features of rock mass behavior.
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[Journal Article] Investigation of application of improved measuring system for in-situ triaxial tests2005
Author(s)
Sobukawa, S., Okada, T., Hosoda, T., Tachikawa, H., Tani, K.
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Journal Title
Proc.34^<th> Rock Mechanics Symposium, JSCE
Pages: 201-206
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Down-hole triaxial test to measure average stress-strain relationship of rock mass2003
Author(s)
Tani, K., Nozaki, T., Kaneko, S., Toyooka, Y., Tachikawa, H.
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Journal Title
Soils and Foundations Vol.43,No.5
Pages: 53-62
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Down-hole triaxial test to measure average stress-strain relationship of rock mass2003
Author(s)
Tani, K., Nozaki, T., Kaneko, S., Toyooka, Y., Tachikawa, H.
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Journal Title
Soils and Foundations Vol.43, No.5
Pages: 53-62
Description
「研究成果報告書概要(欧文)」より
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