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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/80325

    Title: Performance of encased granular columns considering shear-induced volumetric dilation of the fill material
    Other Titles: 考慮受剪引致體積膨脹之外包加勁礫石椿的性能研究
    Authors: Hong, Y. S.
    Contributors: 淡江大學土木工程學系
    Keywords: Geosynthetics;Sand column;Numerical analysis;Encased;Triaxial compression test;地工合成材;砂石椿;數值分析;外包;三軸壓縮試驗
    Date: 2012-12-01
    Issue Date: 2013-01-22 11:32:41 (UTC+8)
    Publisher: London: ICE Publishing
    Abstract: This numerical study investigates the behaviour of geosynthetic-encased sand columns. Based on an elastic-plastic constitutive model used with the non-associated flow rule, the prominent expansive behaviour of medium to dense sands is characterised. Numerical analysis results are verified via laboratory triaxial tests on encased sand columns, where the sand mechanical properties are extracted from simple experimental tests. The tested sand columns in the experiments consist of two sands, encased by sleeves fabricated from two geotextiles. This verification demonstrates that the sand volumetric strain profoundly affects the induced confining pressure of an encased column. Exactly how the encasement stiffness, strength and diameter of the granular column influence encased column response is also studied using numerical analyses. Numerical results indicate that the encasement induces additional confining pressure, subsequently preventing strength yield in the encased columns before the encasement reaches its yield strength. These results further demonstrate that the ratio of encasement stiffness to column diameter significantly affects the response of a granular column. Moreover, it may be unnecessary to encase a small-diameter column with a stiff encasement, whereas encasing a large diameter column with a low-stiffness encasement may produce a limited reinforcing effect.
    Relation: Geosynthetics International 19(6), pp.438 –452
    DOI: 10.1680/gein.12.00029
    Appears in Collections:[Graduate Institute & Department of Civil Engineering] Journal Article

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