| Project/Area Number |
17560439
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geotechnical engineering
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| Research Institution | Muroran Institute of Technology |
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Principal Investigator |
KOHATA Yukihiro Muroran Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (90215301)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 2006: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2005: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Liquefied Stabilized Soil / Fiber material / Seismic strengthening / Triaxial test / Toughness / Small strain / Excavated soil / Recycle / 補強効果 / 靭性 |
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| Research Abstract |
In Japan, recently, the Liquefied Stabilized Soils (LSS) has been used extensively as a back filling soil for cut and covered tunnels or invert part of shield tunnels from the viewpoint of recycling the excavated soil from under ground construction sites in Japanese urban area.
The objectives of this paper are to investigate deformation properties at small strain level of LSS mixed with fiber material to increase the aseismatic performance and to evaluate quantitatively about an effect of fiber material content on a toughness improvement of LSS. A series of undrained triaxial compression tests with a number of small unload / reload cycles during a monotonic loading was performed on the various type LSS and axial strains from less than 0.001 % to about 5 % were measured locally by using local gauges (LDT).
The following conclusions were derived from the results of triaxial compression tests on LSS and LSS mixed with fiber materials.
1) An elastic region increases with increasing a fiber material content and a nonlinearity of q-ea curve tends to reduce. A damage with shearing is prevented due to a mixing of fiber material and an effectiveness of reinforcement is produced.
2) The toughness is improved with increasing a fiber material content within the condition of this paper and it is considered that a fiber material content of 10〜15 kg/m3 is an upper limit to improve the toughness of LSS.
3) The toughness improvement of LSS with fiber material can be evaluated quantitatively by the proposed method in this paper.
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