In this study, soil-geocell interface behavior was investigated from the laboratory pullout test. The pullout resistances acting along wall surfaces of geocells were determined under the different vertical loads. A large scale pullout test box (1500 mm long, 1000 mm wide and 700 mm high) were de-signed and built at geotechnical laboratory of Gazi University in order to determine interaction between cohesionless soil and the geocell. A total of twelve pullout tests were conducted under 10, 25 and 50 kPa of uniform loads. The soil used in this study was sand with specific gravity (Gs) of 2.74, the average parti-cle size (D50) of 1.6 mm, maximum and minimum void ratios were 0.87 and 0.60, correspondingly. The maximum and minimum dry unit weights of the sand were found to be 16.52 and 15.00 kN/m3. The mod-el pullout tests were performed at relative densities of 73 %. The internal friction angle of the sand at rela-tive density of 73 % determined from direct shear tests was 43°. The distribution of pullout resistance along the length of geocells was determined from strain gauges placed on the wall surfaces of geocell. The experimental results showed that the mobilized pullout force increased with increasing normal stresses.
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