| Theoretical Permeability of Two-layered Nonwoven Geotextiles |
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| 作者姓名： | 刘丽芳 储才元 |
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| 作者单位： | College of Textiles,Donghua University,Shanghai 201620 |
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| 摘 要： | The two-layered nonwoven geotextile, which consists of a layer constructed with fine fibers for providing optimal filtration characteristics and another layer constructed with coarse fibers for providing the required mechanical properties, is desirable for drainage and filtration system. Based on Darcy＇s law and drag force theory, a mathematical model on vertical permeability coefficient of two-layered nonwoven geotextile is estabilished. Comparison with experimental results shows that the present model possesses 83.6% accuracy for needle-punched two-layered nonwoven geotextiles. And experimental results also show that with the increasing of needle density the vertical permeability coefficient of two-layered nonwoven geotextiless firstly decreases and then increases, reaching the smallest value at 470 p/cm^2.
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| 关 键 词： | 渗透性 垂直渗透系数 土工布 非织造布 |
| 收稿时间： | 2005-10-20 |
Theoretical Permeability of Two-layered Nonwoven Geotextiles |
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| LIU Li-fang,CHU Cai-yuan.Theoretical Permeability of Two-layered Nonwoven Geotextiles[J].Journal of Donghua University,2006,23(3):71-73. |
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| Authors: | LIU Li-fang CHU Cai-yuan |
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| Abstract: | The two-layered nonwoven geotextile, which consists of a layer constructed with fine fibers for providing optimal filtration characteristics and another layer constructed with coarse fibers for providing the required mechanical properties, is desirable for drainage and filtration system. Based on Darcy's law and drag force theory, a mathematical model on vertical permeability coefficient of two-layered nonwoven geotextile is estabilished. Comparison with experimental results shows that the present model possesses 83.6% accuracy for needle-punched two-layered nonwoven geotextiles. And experimental results also show that with the increasing of needle density the vertical permeability coefficient of two-layered nonwoven geotextiless firstly decreases and then increases, reaching the smallest value at 470 p/cm2. |
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| Keywords: | permeability property vertical permeability coefficient drag-force model two-layered nonwoven geotextiles |
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