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在粒状滤层和土工织物滤层的设计中,必须考虑透水性、保土性及防止淤堵三种基本性能。对于用土工织物作滤层还要考虑其它因素,如织物类型,织物结构,耐久性,也就是抗化学、生物、紫外线照射等的能力。根据过去25年的研究和试验已建立了确定土工织物反滤层设计的两个主要指标——织物的透水性和保土性的方法。土工织物的透水性可按照 ASTM 试验方法很容易测试;保土性判定标准根据表观孔径(简称 AOS)判定,表观孔径参数按照 ASTM 土工织物表观孔径测定方
In granular filter and geotextile filter design, we must consider the three basic properties of water permeability, soil conservation and prevent clogging. For geotextiles for filter layer also consider other factors, such as fabric type, fabric structure, durability, that is, anti-chemical, biological, ultraviolet radiation and other capabilities. Based on the past 25 years of research and experimentation, two key indicators have been established to determine the design of geotextile filters - the water-permeability and soil-preserving properties of fabrics. Permeability of geotextiles can be easily tested in accordance with ASTM test methods; Criteria for determination of soil conservation according to the apparent pore size (referred to as AOS) to determine the apparent pore size parameters in accordance with ASTM geotextile apparent pore size measurement side