Pullout behavior of geocell in granular soil


Işık A., Gürbüz A.

13th International Congress on Advances in Civil Engineering,, İzmir, Turkey, 12 - 14 September 2018, pp.1-8

  • Publication Type: Conference Paper / Full Text
  • City: İzmir
  • Country: Turkey
  • Page Numbers: pp.1-8
  • Erzincan Binali Yildirim University Affiliated: No

Abstract

In this study, soil-geocell interface behavior was investigated by laboratory pullout test. The behavior of pullout resistances acting along the geocells was determined under different vertical loads. A large scale pullout test box (1500 mm long, 1000 mm wide and 700 mm high) was designed and built at geotechnical laboratory of Gazi University to investigate the pullout behavior of geocell in granular soils. A total of twelve pullout tests were conducted under 10, 25 and 50 kPa uniform surcharge loads. The soil used in this study was sand with specific gravity (Gs) of 2.67, the average particle size (D50) of 1.6 mm, maximum and minimum void ratios were 0.79 and 0.43, correspondingly. The maximum and minimum dry unit weights of the sand were found to be 18.10 and 14.52 kN/m3. The model pullout tests were performed at relative densities of 73 %. The internal friction angle of the sand at relative density of 50 % was 41˚ which was determined from direct shear tests. The distribution of pullout resistance along the length of geocell specimens was evaluated by strain gauges and LVDT’s (Linear Variable Differential Transformers). Experimental results showed that mobilized pullout force increased with increasing normal stresses. In addition, as the SxL (cell number x length) parameter representing dimension effect of geocell elements on the pullout force increases, the pullout forces increase as well.