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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/44513

    Title: 地工合成物包裹砂柱試體之尺寸效應探討
    Other Titles: The size effect on Geosynthetic-Encapsulated Sand Column Specimens
    Authors: 魏照榮;Wei, Chao-jung
    Contributors: 淡江大學土木工程學系碩士班
    吳朝賢;Wu, Cho-sen
    Date: 2009
    Issue Date: 2010-03-16 10:33:31 (UTC+8)
    Abstract: 眾多土壤改良工法中,砂石樁改良法施工迅速,除了可傳遞荷重外,並能加速地盤排水及減少土壤沈陷,因此對砂石樁力學性質之研究為一重要且富價值之課題。打設於軟弱土層中之砂石樁,樁體上部結構易因側向束縛力不足而產生破壞,對砂石樁加勁可增加側向束縛應力並減少其破壞。由於試驗試體與現地砂石樁存在著尺寸效應,而尺寸效應對加勁效果有顯著之影響,故本研究主旨為探討其尺寸效應與加勁效果之關係。
    Granular columns were introduced into engineering practice to improve bearing capacity and reduce settlement in a weak or soft soil. This method is considered one of the most versatile and cost effective techniques for improving in-situ ground conditions.
    Most granular columns that fail from bulging near the top are due to insufficient lateral support.Skirting the granular column by wrapping a geosynthetic liner around the top section of the column and enveloping the granular column in a membrane were proposed to strengthen the column. When vertical and coincident lateral deformations of the granular column occur under a vertical load, the encapsulating geosynthetic generates additional confining stress to the column.
    Because the mechanical behavior of the granular material is usually controlled by the lateral confining pressure, the improvement in bearing capability from the geosynthetic-encapsulated granular column depends upon the mobilization of lateral or confining stresses exerted by the geosynthetic. The reinforcing effect of the granular column thus depends on the size of the specimen and the filled granular material.
    Transferred the radial strain rate of sand column to the tensile rate of geosynthetic.Hyperbolic model was used to simulate tensile stress-strain relation of the geosynthetics.
    Results from three geotextiles encapsulating sand specimen of three diameter size show: (1) Geotextile encapsulating sand column enhances the axial strength; the reinforced specimen exhibited significant apparent cohesive strength. (2)The size effect clearly increase with lower confining pressure; The small-size samples show significantly higher stress ratio.
    Appears in Collections:[土木工程學系暨研究所] 學位論文

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