EVALUATION OF VARIOUS FACTORS TO PULL-OUT RESISTANCE OF VARIOUS TYPES OF REINFORCEMENT EMBEDDED IN SAND
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- NISHIKIORI Hiroki
- 東京理科大学大学院 理工学研究科 土木工学専攻，地盤工学研究室
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- SOMA Ryouichi
- 東京理科大学大学院 理工学研究科 土木工学専攻，地盤工学研究室
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- AIZAWA Hiroyuki
- ( 独 ) 鉄道・運輸機構 北陸新幹線建設局
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- HIRAKAWA Daiki
- 防衛大学校 システム工学群 建設環境工学科
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- TATSUOKA Fumio
- 東京理科大学 理工学部 土木工学科
Bibliographic Information
- Other Title
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- 補強材の砂地盤からの引抜け抵抗に与える各種要因の評価
- ホキョウザイ ノ スナジバン カラ ノ ヒキヌケ テイコウ ニ アタエル カクシュ ヨウイン ノ ヒョウカ
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Description
To achieve a high seismic stability of a newly proposed bridge type, called the GRS integral bridge, a high tensile resistance of reinforcement layers at the back of the facing is crucial. This resistance is the minimum of the connection strength between the reinforcement and the facing, the tensile rupture strength of reinforcement and the pull-out resistance of reinforcement. To evaluate the pull-out resistance of a rough phosphor bronze grid used in the model shaking table tests performed to evaluate the seismic stability of GRS bridge in comparison with those of other types of grid reinforcements including polymer grids, a series of pull-out tests were performed on these various types of reinforcement embedded in Toyoura sand under different vertical confining pressures. The pull-out resistance increases with an increase in: 1) the covering ratio and surface roughness of the longitudinal members of grid; and 2) the thickness of transversal members of grid. The peak resistance by the surface friction (factor 1) tends to be mobilized earlier than the passive pressure resistance (factor 2). For this examination, we considered a reciprocal effect of this both and made an expression to express influence to give the drawing resistance of the reinforcing structure. According to this expression, the frictional resistance of the reinforcing structure surface and the passive pressure resistance of the cross piece front were added to a certain constant value linearly, but it did not almost increase after it.
Journal
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- Geosynthetics Engineering Journal
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Geosynthetics Engineering Journal 23 23-30, 2008
Japan Chapter of International Geosynthetics Society
