Determination methods for effective opening size of geotextiles

The determination methods for the effective opening size of geotextiles and geotextile-related products are discussed. They include wet sieving method and dry sieving method. Through comparison and analysis of the test data, the dry sieving method, is applicable to woven geotextiles, and the wet sieving method can be used for all the geotextiles in duding non woven geofabrics.