STUDY ON THE METHOD FOR APPARENT OPENING SIZE TESTS OF GEOTEXTILE

The apparent opening size (O95) of geotextile is a physical parameter closely related to the permeability property and/or amount of clogging of geotextile. In this paper, the various methods for apparent opening size of geotextile are discussed. The apparent opening size tests of geotextile on the wet and hydrodynamic method were performed, and the apparent opening size of each test method was evaluated. Based on test results, an improvement of each test method was proposed. It was found that the value of apparent opening size of geotextile obtained from wet and hydrodynamic methods were near to a theory value proposed by J.P. Giroud.