ONE PROPOSAL ON THE DESIGN OF NONWOVEN GEOTEXTILE FILTER LAYER CONSIDERING PERMEABILITY DUE TO CLOGGING

Abstract

Recently, geotextile filter materials are often used to from drainage layers within earthfill embankments and at earthfill-foundation. This is because scarcity of traditional river- bed materials and concern over the environmental impact of using remaining resouces.
The geotextile filter material will become clogged soil particle over time, thus reducing its permeability. However, this drawback has not been considered in design up to this time.
We proposed an alternative method which carefully considers this reduction in permeability so its indispensable items, and incorporated the results of thorough field testing.