Geotextile degradation modes

The impact of geotextile degradation may be realized immediately, gradually, or suddenly after an extended period of time. These modes of degradation are depicted in Fig. 9.1 and the subsequent discussion. 

Requirement Geosynthetic characteristic Test/ measurement procedure Function  

Retention Opening size ASTM D6767 ASTM D4751 ISO 12956 X X X X X 

Permeability /flow rate Permeability normal to the plane ASTM D4491 ASTM D5493 ASTM D7701 ASTM D7880 ISO 11058 ISO 10776 X X X X X 

Flow capacity Flow capacity In the plane/ transmissivity ASTM D4716 ASTM D6574 ASTM D6918 ASTM D498 ISO 12958 ISO 18325 - X  

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Depending on the prevailing wave loads and degradation mechanisms, GSCs may experience different types of failure modes (i) hydraulic failure modes, (ii) geotechnical failure modes, and (iii) failure modes related to the geotextile itself (Fig. 21.14). In the following, only the first type which is related to hydraulic stabihty imder wave loads will be addressed. 

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