Influence of Cell Shape on Restraint Effect of Geocell-reinforced Soils

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A geocell which is made of a three dimensional cell structure using geosynthetics materials to confine cohesionless soil particles in the plane direction is one of the reinforced earth construction methods. The geocell having a slab-shape mattress structure aims to provide a bending rigidity, to increase the strength and to spread the stresses downwards the subsoil ground. It is known that the slab effects of geocell depends on various factors of reinforcement materials and filling soils.In this study, three types of 5cm height cells having triangle, square and hexagonal cross sections are tested in order to investigate the fundamental properties of geocell. The geocells filled with air-dried Toyoura sand which is compacted in the specified density are compared with non-filled cells. Uni-axial compression tests in the cross-plane section are carried out to examine the influence of cross section size, number, tolal area of side wall, total area of cross section of cells.From the test results it was found that the reinforcement effects were increased with the number of cells because of increasing the restraint area of side walls, and increased with the numbers of corner which disperses the concentrated stress. Moreover it was confirmed that the total area of geocell distinctly influenced on reinforcement effects.
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