防淤堵滤层新材料的开发与性能

为了满足实际使用过程中对过滤性能和机械性能两方面的要求，设计开发了一种防淤堵滤层新材料，它是具有双层结构的针刺非织造土工织物。其中一层由较细的纤维组成，使土工织物具有优良的过滤性能；另一层由较粗纤维组成，提供土工织物的机械性能。通过实际测试并与常规土工织物进行对比得出，该防淤堵滤层材料具有较大的特征孔径和垂直渗透系数，能够满足防淤堵要求，而且在生产工艺相同的条件下，其机械强度也优于常规土工织物，是一种很有发展前景的新型土工材料。同时，还探讨了针刺密度对土工织物各项性能的影响。

Development and Properties of Anti-clogging Filtration Geotextile

An ariti-clogging filtration geotextile was designed and developed. This geotextile consists of two layers: one layer constructed with fine fiber and having a thickness selected to provide optimal filtration characteristics; and the other constructed with coarse fiber providing the required mechanical properties. Comparing with conventional geotextiles, the two-layer geotextile was proved that, it has more bigger characteristic pore size and vertical permeability coefficient, and can reach the requirement of anti-clogging. Furthermore, its mechanical strength is higher than dial of conventional geotextile with the same processing parameters. So this is a type of very prospective geotextile. At the same time, the relation between needle-punched density and properties of nonwoven geotextile are also studied.