what is the purpose of geotextile on gabion walls.?
Geotextiles are fabrics associated with soil, earth or rocks. Gabions were earth filled barricades meant to halt enemy fire during battle. I'm guessing geotextiles on gabion walls more effectively hold back the earth or filler. They might have well suited permeability or retentive qualities for gabions. There are a few other definitions for gabions. But this is the militaristic definition. Gabions are also used in dams and such. In this case, geotxtiles might have good properties for being submerged in water and still retaining whats inside the gabions.