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タイトル: Mechanical Characteristics of Geogrid-Reinforced Gravel in Large-Scale Triaxial Tests
その他のタイトル: 大型三軸試験によるジオグリッド補強礫の力学的特性
著者: Ho, Van Thang
著者(別言語): ホ, ヴァン タン
発行日: 2012年9月27日
抄録: Gravel materials are commonly used in the construction of civil engineering infrastructure ranging from pavements to foundations, embankments or dams. In their design life, these structures are subjected to both monotonic and cyclic loads. Geogrids have been used to improve the performance of these structures in many projects. The properties of geogrids and the interaction between geogrids and gravel materials often govern the extent of improvement. The aim of this study is to examine the effect of geogrid reinforcement on the peak strength and the stiffness of large prismatic gravel specimen. To implement objectives of this study, a series of large-scale triaxial tests were conducted on unreinforced and reinforced gravel specimens of 50 cm in height and 23 cm times 23 cm in cross-section, using an apparatus developed at the Institute of Industrial Science, University of Tokyo (Anh Dan et al. 2006). The material used was crushed sandstone originated from Tochigi prefecture in Japan. In addition to the variation of the cell pressure, the test series also includes the variation of geogrid types. As the specimens were in rectangular prismatic shape with relatively large dimensions as depicted above, placing LDTs in vertical as well as horizontal directions was possible to detect strains locally in those directions. All specimens were initially kept under isotropic consolidation and then sheared with triaxial compression (TC). The experimental study also includes the investigation of the stress distribution in the soil mass with and without reinforcement and the strain distribution along reinforcement. The vertical and horizontal local stress distribution in the soil were measured by placing earth pressure cells at pre-specified locations/depth within the specimen. The strain distribution along the geogrid was recorded using electrical resistance strain gauges that were instrumented at different locations along the geogrids. Test results show a significant increase of the peak strength and stiffness due to geogrids. The PP geogrids perform better than Combi-grid in combination with gravelly soil. The test results also show that the relative reinforcing effect is higher for small lateral confining pressures, as in case at small depths. In addition, geogrid reinforcement does not show any significant improvement in small strain stiffness of granular specimen, except for the case with Japanese geogrid. From these results, a simplied model is proposed to measure the confining effect of reinforcement.
内容記述: 報告番号: ; 学位授与年月日: 2012-09-27 ; 学位の種別: 修士 ; 学位の種類: 修士(工学) ; 学位記番号: ; 研究科・専攻: 工学系研究科社会基盤学専攻
URI: http://hdl.handle.net/2261/52579
出現カテゴリ:025 修士論文
1130225 修士論文(社会基盤学専攻)

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