Woven slit-film geotextiles are often subjected to in-plane tensile loads in engineering applications, which may alter relevant permeability properties. The fractal model of the permeability coefficient in woven geotextiles is extended to predict the permeability coefficient of geotextiles subjected to uniaxial and laterally constrained uniaxial tensile strains. Based on the observation and summary of the variation of the pore size distribution pattern with tensile strain, the pore unit model is introduced. The model is expressed as the functions of the fractal dimension, pore size characteristics, physical parameters and weft strain. A clamping device capable of applying uniaxial tension and laterally constrained uniaxial tension to geotextiles is invented. The validation of the model is verified using the vertical permeability coefficient test and the digital image analysis method on two selected woven geotextile samples. It is shown that the permeability coefficient increased with increasing uniaxial tensile strain. Furthermore, the experimental values tended to change more significantly under laterally constrained uniaxial strain conditions for thinner geotextiles approaching breaking strain and thicker geotextiles. The improved model can accurately predict the values and increasing rate of the permeability coefficient of woven geotextiles subjected to uniaxial and laterally constrained uniaxial tensile strains.

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机织土工布在单轴和横向约束条件下的渗透性

机织切膜土工布在工程应用中经常受到面内拉伸载荷，这可能会改变相关的渗透性能。机织土工织物渗透系数的分形模型被扩展以预测土工织物在单轴和横向约束单轴拉伸应变下的渗透系数。在观察和总结孔径分布模式随拉伸应变变化的基础上，引入孔单元模型。该模型表示为分形维数、孔径特征、物理参数和纬向应变的函数。发明了一种可对土工布施加单轴拉力和横向约束单轴拉力的夹紧装置。使用垂直渗透系数测试和数字图像分析方法对两个选定的机织土工织物样品进行了模型验证。结果表明，渗透系数随着单轴拉伸应变的增加而增加。此外，对于接近断裂应变的较薄土工布和较厚的土工布，在横向约束单轴应变条件下，实验值往往会发生更显着的变化。改进后的模型可以准确预测机织土工布在单轴和横向约束单轴拉伸应变下的渗透系数值和增长率。对于接近断裂应变的较薄土工布和较厚的土工布，在横向约束单轴应变条件下，实验值往往会发生更显着的变化。改进后的模型可以准确预测机织土工布在单轴和横向约束单轴拉伸应变下的渗透系数值和增长率。对于接近断裂应变的较薄土工布和较厚的土工布，在横向约束单轴应变条件下，实验值往往会发生更显着的变化。改进后的模型可以准确预测机织土工布在单轴和横向约束单轴拉伸应变下的渗透系数值和增长率。