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Abstract
It seems that performance of geotextiles is directly related to their survivability, which affects design economy. This paper aims to present design graphs in order to estimate the tensile strength reduction factors of nonwoven geotextiles due to the installation process in the soil embankment. The design graphs have been established based on a series of full-scale field tests and analytical procedures. The variables include medium grain size of backfill materials, subgrade CBR, relative density of backfills, as-received geotextile tensile strength and the transferred stress over the geotextiles level, during installation. It is concluded that tensile strengths of the geotextile got decreased in the aftermath of compaction process under higher relative density, larger particle size of the backfill, lower as-received grab tensile strength (decreasing the AASHTO’s geotextiles class from 1 to 3) and finally, being in the neighbourhood of weaker subgrades. These intensifying conditions necessitate designers using high-survivability geotextiles.