| Project/Area Number |
03660252
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
農業土木
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| Research Institution | Miji University |
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Principal Investigator |
TANAKA Tadatsugu Faculty of Agriculture, Department of Agriculture, Professor, 農学部, 教授 (70167500)
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| Project Period (FY) |
1991 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1993: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1992: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1991: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | Model Test / Underground Structures / Collapse / Finite Deformation Analysis / Scale Effect / Progressive Failure / Shear Band / Anisotoropic Hardening / 砂地盤 / アーチ型構造物 / 崩壊荷重 / 有限要素解析 / 非線形性 / 地盤 / 弾塑性 / 有限要素法 / 適応的メッシュ分割 / ひずみ軟化 / 支持力 |
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| Research Abstract |
1. Models of arch-type underground structures are prepared using a thin plastic film and the air-pluviated Toyoura sand. The pressure is applied on the sand layr by an air-bag and collapse loads of the underground arches are obtained. The finite element analyzes of the model underground structures are carried out. In the analyzes, a constitutive equation including shear band effects for the sand layr is used and finite deformation analysis is applied. The comparable results are obtained but in the analyzes the collapse loads are very sensitive to the conditions of end portion of the arches i.e., completely fixed or partially fixed.
2. Scale effects of the soil structures such as bearing capacity of footings and pullout resistance of anchors, are currently investigate using centrifuge model tests. The scale effects are considered to be due to the reduction of the internal friction and progressive failure accompanying the shear banding. The effect of the progressive failure is not properly taken into account only using centrifuge model tests. In this study, we clarified that the sacle effects are depend on particle size of the sand both by the experimental observations under normal gravity conditions and the finite element analysis with the constitutive equation including the shear band effect.
3. The earthquake-resistant design of the soil structures needs dynamic response analysis which take into account the failures. The fill-type model is prepared using the Toyoura sand and dynamic load is applied by earthquake simulator. The finite element analysis is carried out and compared to the model experimental results. The consistent results are obtained by the constitutive equation with a anisotropic hardening and the shear banding.
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