Abstract The effect of unequal biaxial tensile strains on the filtration behaviour of continuous filament needle-punched nonwoven geotextiles was investigated via gradient ratio tests. The filtration behaviour of four groups of unequal biaxial tensile strains were examined, including the gradient ratio (GR), permeability of the soil-geotextile system, mass of soil loss, and permittivity of pure geotextiles. The strains in the machine direction of a geotextile in the four groups were the same, ranging from 10% to 30%, with the ratios of the strain in the machine direction to that in the cross-machine direction set to 1, 2, 3, and 4, respectively. It is shown that for the same strain ratio, the GR value at the time of test termination ( G R t ) increases with increasing strain, and the permeability of the soil-geotextile system, permittivity of pure geotextiles, and the soil loss decrease with increasing strain. For the same strain in the machine direction, there are general decreasing trends for the G R t value and soil loss with increasing strain ratio, and the permeability of the soil-geotextile system and permittivity of pure geotextiles under equal biaxial tensile strains are higher than those under unequal biaxial tensile strains.

中文翻译：

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不等双轴拉伸应变对长丝针刺非织造土工布过滤性能的影响

摘要 通过梯度比试验研究了不等双轴拉伸应变对连续长丝针刺非织造土工布过滤性能的影响。研究了四组不等双轴拉伸应变的过滤行为，包括梯度比 (GR)、土壤-土工织物系统的渗透性、土壤流失质量和纯土工织物的介电常数。四组土工布的纵向应变相同，范围为10%～30%，纵向应变与横向应变之比设为1、2、3 , 和 4，分别。结果表明，对于相同的应变比，试验终止时的 GR 值（ GR t ）随着应变的增加而增加，土 - 土工织物系统的渗透性增加，纯土工布的介电常数，土壤流失量随着应变的增加而减少。对于相同的纵向应变，随着应变比的增加，GR t 值和土壤流失量总体呈下降趋势，并且在等双轴拉伸应变下，土壤-土工织物系统的渗透率和纯土工织物的介电常数均高于这些值。在不等的双轴拉伸应变下。