Abstract The basic pore unit model is extended to predict the strained pore size characteristics of woven slit-film geotextiles subjected to unequal biaxial tensile strains. The strained per cent open area (POA) and analytical pore size are expressed as functions of the weft strain and the warp strain to weft strain ratio. The influence of the biaxial tensile strain on pore size characteristics is evaluated in three woven slit-film polypropylene geotextile samples using image analysis under the warp strain to weft strain ratios of 1, 2, 3 and 4. It is shown that the experimental POA and O95 increased significantly with increasing strain at different warp strain to weft strain ratios, and the PSD curves moved toward the direction of large open sizes. The analytical models of POA and pore size can accurately predict the increasing trend of POA and O95. Moreover, unequal biaxial tensile strains can significantly change the shape of the pores, which may influence the results of the pore size obtained by indirect methods. A larger warp strain to weft strain ratio can lead to a larger change in the pore shape when the length to width ratios of initial pores are close to 1.

中文翻译：

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不等双轴拉伸应变下编织缝膜土工布孔径特性的预测

摘要 将基本孔隙单元模型扩展到预测不等双轴拉伸应变作用下编织缝膜土工布的应变孔径特性。应变百分比开口面积 (POA) 和分析孔径表示为纬应变和经应变与纬应变比的函数。在经向应变与纬向应变比分别为 1、2、3 和 4 的情况下，使用图像分析评估了三个编织缝膜聚丙烯土工布样品中双轴拉伸应变对孔径特性的影响。 结果表明，实验 POA 和在不同的经向应变与纬向应变比下，O95随着应变的增加而显着增加，并且PSD曲线向大开口尺寸的方向移动。POA和孔径的分析模型可以准确预测POA和O95的增加趋势。此外，不等的双轴拉伸应变会显着改变孔的形状，这可能会影响间接方法获得的孔径结果。当初始孔隙的长宽比接近 1 时，较大的经向应变与纬向应变比会导致孔隙形状发生更大的变化。