| Project/Area Number |
06555144
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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 | 試験 |
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| Research Field |
Geotechnical engineering
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| Research Institution | TOTTORI UNIVERSITY |
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Principal Investigator |
KIYAMA Hideo TOTTORI UNIVERSITY,FACULTY OF ENGINEERING,PROFESSOR, 工学部, 教授 (30026067)
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| Co-Investigator(Kenkyū-buntansha) |
FUJIMURA Hisashi TOTTORI UNIVERSITY,FACULTY OF ENGINEERING,ASSOCIATE PROFESSOR, 工学部, 助教授 (30032030)
NISHIMURA Tsuyoshi TOTTORI UNIVERSITY,FACULTY OF ENGINEERING,RESEARCH ASSOCIATE, 工学部, 助手 (90189308)
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| Project Period (FY) |
1994 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1995: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1994: ¥4,400,000 (Direct Cost: ¥4,400,000)
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| Keywords | Tunnel / NATM / Support-stiffness / Initial stresses condition / Elastic solution / DEM / Characteristic curve |
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| Research Abstract |
Active mobilization of bearing capacity of surrounding rock mass characterizes the NATM concept of supporting. However, any quantitative expressions of this bearing capacity have not been recognized commonly. In the present investigation, "a support load of surrounding rock mass", "a support load of lining" and "the total support load of a tunnel" for a two-dimensional elastic circular tunnel are distinctly evaluated by using a common index, support-stiffness, which is defined by a relative stiffness of each support to the original stiffness of the rock removed from within the opening. The theoretical construction of bearing characteristic curves of elastic rock masses in tunnelling is rationally achieved with these three support-stiffnesses.
Granular assembly simulations were executed to illustrate characteristic curvea for tunnelling. The aim of this analysis is to get characteristic curves which may be varied depending on the stress-strain property of the rock mass and the initial ea
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rth pressure level. The most important result is that there appear to be three typical characteristic curves : elastic type to elasto-plastic type, Fenner-Pacher type, or catastrophic type. The discussion of these curves based on the principles of theoretical procedure gives us advantages to quantitative evaluation of the bearing capacity of rock mass.
The behavior of a tunnel lining is a ground-lining interaction problem which depends on the relative stiffnesses of lining and the ground as well as the initial stress conditions. The common index "support-stiffness" must be useful to evaluate such problems. Finally, a strict solution of the relative stiffness is derived for both full slip and no-slip conditions at the ground-lining interface, moreover, the solution is modified for the interaction to be not affected directly by the ground movements due to the initial stresses before tunnelling. The analytical results evaluated with the common index can be used for practical purpose and the further development of tunnel support design. Less
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