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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/101641

    Title: 軟弱黏土中層狀加勁砂柱試驗
    Other Titles: Model test for a laminated reinforced sand column embedded in soft clay
    Authors: 簡嘉緯;Chien, Chia-Wei
    Contributors: 淡江大學土木工程學系碩士班
    Keywords: 軟弱黏土;層狀加勁砂柱;地工合成材;模型試驗;承載力;側向腫脹;Soft clay;Laminated reinforced sand column;geosynthetic;Model test;Bearing capability;Lateral swelling
    Date: 2014
    Issue Date: 2015-05-01 16:12:58 (UTC+8)
    Abstract: 在基礎工程設計中,現地土壤過於軟弱無法提供足夠的承載力時,一般常使用砂柱工法進行土壤改良,砂石樁雖可承受軸力與剪力,但於近地表處由於側向圍束力不足,易造成砂樁頂層產生腫脹,進而限制砂土樁承載的能力。利用地工合成材加勁砂樁,防止砂柱頂端圍束力不足的現象,進而提升整體砂柱承載力,為近年發展的工法。


    Sand columns have been used in engineering practice to improve the bearing capacity of soft clay in recent years. Although the sand column can bear axial stress and shear stress from surface load, but due to the lack of lateral confining pressure in the near-surface that often caused bulging failure in the top portion of the column, reduce the carrying capacity of the sand column. Reinforce a sand column with laminated geosynthetics is feasible and effective solution to improve bearing capability of a sand column.
    In this study, model test on single geosynthetic-laminated sand columns installed in soft clay was conducted. Similarity analysis was executed first to determine suitable properties of the constituents used in the model tests to ensure comparable behavior between the prototype-scale and model-scale reinforced granular columns. Three types of geosynthetics was employed to reinforce the sand columns either with 5 or 10 layers of geosynthetic sheets horizontally placed in these model sand columns.
    Experimental results showed that horizontally inserted reinforcements improve the bearing capability of the model sand columns; marked improvement was achieved for sand columns reinforced with geotextile of relatively medium to high stiffness. Horizontal reinforcement also restrained radial strain of the columns significantly. Additionally, horizontal reinforcements affected stress transmission character along the length of the sand column and thus the bearing capability of the column.
    Appears in Collections:[土木工程學系暨研究所] 學位論文

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