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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/34510

    Title: 張力作用對織物開孔徑之變化及其過濾特性之探討
    Other Titles: The influences of tensile stress on pore size distribution and filtration characteristics of geotextiles
    Authors: 王瑞鴻;Wang, Ruei-hung
    Contributors: 淡江大學土木工程學系碩士班
    吳朝賢;Wu, Cho-sen
    Keywords: 坡降比試驗;地工織物;張應變;有效開孔徑;透水速率;Gradient ratio test;Geotextiles;Tensile strain;Apparent opening size;Flow velocity
    Date: 2006
    Issue Date: 2010-01-11 05:20:03 (UTC+8)
    Abstract: 本研究使用兩種織布及兩種不織布於未伸張及張應變為5%、10%、20%時,進行變水頭透水速率量測、濕篩法開孔徑量測、及改良ASTM D5101之GR試驗儀;以連續變換水力坡降進行土壤-地工織物系統坡降比試驗,以探討織物於未伸張及張應變下之坡降比值及滲流量變化。試驗結果以織物有效開孔徑、透水速率變化、GR值、系統滲流量及土層滲透係數進行比較與討論。
    坡降比試驗結果顯示,相同的水力坡降下,隨張應變的增加GR值上升幅度有隨之降低的趨勢,系統滲流量及土層滲透係數k13 及k35有隨之增加的趨勢。相同張應變下,GR值、土層滲透係數k13 及k35隨試驗延時增加有逐漸上升的現象,系統滲流量隨水力坡降增加有逐漸增加的現象,土層滲透係數k13 及k35隨試驗延時增加有逐漸降低的現象。
    The influences of unidirectional tensile stain on pore size distribution and filtration characteristics of geotextiles were investigated in this study. Apparatus have been designed and built for determining pore size distribution, measuring flow rate through plain geotextile, and conducting a gradient ratio test. A unidirectional strained geotextile specimen was secured by clamping a pair of steel rings on the specimen; three experiments were carried out collaborated with the clamped specimen. Four geotextiles, two nonwoven and two woven, were employed in this study. The geotextiles were stretched to 5%, 10% and 20% strains prior to installation in apparatus. The experimental results show: (1) For all tested geotextiles, linear function appears to be appropriately in describing relationship between the AOS and the tensile strain. The pore size distribution curves corresponding to 20% strain for both woven geotextiles are distant from the other three curves corresponding to lower strains. (2) There is a growth in the flow rate through the plain geotextile, which is proportional to the magnitude of the tensile strain as the strain is lower than one corresponding to the peak tensile strength. A remarkable increase in flow rate for both woven geotextiles strained at 20% strain is noted, which can be associated to the distinctive pore size distribution. Tensile strains corresponding to peak strength are 11.8% and 14.3% for woven geotextiles W1 and W2. Significantly different behavior of W1 and W2 geotextiles at 20% strain from that of the lower strains may be contributed to the over-straining of woven geotextiles. (3) Under a specific hydraulic gradient, increase of the tensile strain reduces the gradient ratio; the effect is more pronounced for nonwoven geotextiles. The stable flow rate for the system collaborated with stretched geotextile relative to the un-stretched geotextule increase with the increase of the tensile strain except for NW1 geotextile at 5% strain and i=5 condition.
    Appears in Collections:[Graduate Institute & Department of Civil Engineering] Thesis

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