Effect of Sand Placement Method on the Interface Friction of Sand and Geotextile

Abstract

The influence of the sand placement method above geotextile layer on interface shear strength behavior was investigated. Seven different types of woven and non-woven geotextiles were used with only poorly graded sand. The investigation involved placement of sand layer through inclined horizontal plane with different angles. This step constitutes a fundamental step for assessing soil to be deposited in different plane and, therefore, with different internal soil fabric. The interface shear strength was evaluated using direct shear test. Although the investigated soil is uniform poorly graded sand, the influence of the deposit plane was significant especially for non-woven geotextile. Differences in soil interface shear strength associated with the tested geotextile samples show that samples with higher mass per unit area and same opening sizes had the higher interface friction angle regardless the bedding plane.