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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/34503

    Title: 地工合成物水平加勁砂柱試體之力學行為探討
    Other Titles: Mechanical behavior of geosynthetic-laminated sand columns
    Authors: 蔡伊雯;Tsai, I-wen
    Contributors: 淡江大學土木工程學系碩士班
    吳朝賢;Wu, Cho-sen
    Keywords: 砂柱;加勁;地工合成材;三軸試驗;granular column;reinforced;geosynthetic;triaxial test
    Date: 2007
    Issue Date: 2010-01-11 05:19:42 (UTC+8)
    Abstract: 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發生破壞,對砂石樁加勁可增加側向束縛應力並減少其破壞。本研究進行實驗室靜態三軸試驗以求得水平加勁砂石樁之應力-應變行為,且透過改變圍壓、加勁材種類、加勁材層數及試體尺寸等參數來分析此複合材料之力學行為。
    試驗結果顯示:加勁試體之三軸試驗進行至軸向應變32%時,軸差應力仍持續上昇且未達尖峰值。加勁試體之視凝聚力與 角均隨著所施加之軸差應力而上升,加勁材勁度越高,加勁後試體所發揮之視凝聚力亦越高,加勁材勁度對試體 角並無明顯影響。
    Most granular columns that fail from bulging near the top are due to insufficient lateral support. Laboratory triaxial compression tests were carried out in order to determine the stress-strain relation of sand columns. The mechanical behavior of the composite material was investigated through varying the number of geosynthetic layers, types of geosynthetic, different diameters of sample, and confining pressure.
    Transferred the radial strain rate of sand column to the tensile rate of geosynthetic. A linear relation was used between the tensile strain and tensile force of the geosynthetic.
    As observed from the the test result , the deviatoric stress varied for different types of geosynthetics used in different layers. The different in friction angle is marginal. But the c value is observed to be quite sensitive to the reinforcement types and layers of geosynthetic.
    Increase in stress for reinforced cand is more pronounced for greater number of geosynthetic layers. Nevertheness, the stress ratio decreases with an increase in confining pressure. The small-size samples show significantly higher stress ratio. The size effect clearly increase with higher number of geosynthetic layers and lower confining pressure.
    A numerical procedure to investigate the stress-strain relation of sand column. The theoretical analysis was validated through laboratory triaxial compression tests. The average error of deviatoric stress is less than 13.5%, for volumetric strain the average error is around 29.2%.
    Appears in Collections:[土木工程學系暨研究所] 學位論文

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