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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/44512

    Title: 外包加勁砂柱之數值模擬
    Other Titles: Numerical modeling of geosynthetic-encapsulated sand columns
    Authors: 黃振業;Huang;Chen-yeh
    Contributors: 淡江大學土木工程學系碩士班
    洪勇善;Hong, Yung-shan
    Keywords: 地工合成材;外包加勁;數值模擬;柏松比
    Date: 2009
    Issue Date: 2010-03-16 10:33:24 (UTC+8)
    Abstract: 在基礎工程設計中,砂石樁改良法具有經濟、迅速及彈性大等優點。傳統砂石樁雖可承受軸力與剪力,但於樁體上部結構容易因束制力不足而產生破壞,一直以來工程師不斷的尋求對砂樁土體加勁的方式,以提高砂石樁之強度。其中,對砂石樁採用地工合成材外包加勁的方法,為目前可行的方法之一。



    The stone column technique is a low cost, time saving, and flexible construction method for ground improvement. When the stone columns are installed in soft clay soils, the lateral confinement offered by the surrounding soil may not adequate to form the stone column due to not be able to develop the required load-bearing capacity. In such soil, the required lateral confinement can be induced by encapsulating the column with tensile geotextile material.

    The purpose of this study is to investigate the mechanical behavior of geotextile encasement on the sand columns using the finite difference analysis. The results from the numerical analysis studies are presented to quantify the effect of confinement and mechanism for improvement in load capacity due to encasement. Based on the results obtained from this study, the following conclusions are made:

    1. The sand that would be used in the model was tested by triaxial tests to develop its stress-strain volume relationship, which provide the basis for numerical analysis. The strain hardening - softening volume dilation model of the sand in present study proved that it could suitable simulates the dilative behavior on pre-peak deviatoric stress.

    2. Volumetric strain reduction percentage increase with the increase in the geotextile stiffness after 10% axial strain. Due to the Poisson effect, the volumetric strain reduction tendency is not obvious before 10% axial strain.

    3. At a specific axial strain, the radial strain reduction effect is higher for stiffer geotextiles to specimen subjected to low chamber pressure. However the radial strain reduction effect degrades with higher chamber pressure.

    4. The confinement stress increment in the reinforcement obviously underestimates 35% ~ 50% against the theoretical solutions.
    Appears in Collections:[Graduate Institute & Department of Civil Engineering] Thesis

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