The researchers studied how geotextiles behave over time in reinforced soil walls. They tested woven and nonwoven geotextiles in both the lab and the field. The walls held up well over 4 years, but nonwoven geotextiles deformed more under pressure. Strain rates increased when the soil was stressed. Lab tests underestimated time-dependent behavior, but in-isolation tests were more accurate. Installation damage and wetting-drying processes affected strain predictions.