Hdpe Geocell forms a new composite solid soil when filled with compacted soil, and the mechanical and geotechnical properties that can be enhanced by the hdpe geocell. When the soil in the geocell is under pressure, as in the case of a load support application, the hdpe geocell can create lateral stresses on the perimeter cell walls. The 3D confinement area reduces the lateral movement of the soil particles, while the vertical load on the included fill results in high lateral stresses and resistance at the cell soil interface. These increase the shear strength of the confined soil, creating a hard soil or slab to spread the load over a wider area. Hdpe Geocell reduces punching shear in soft soils, increases shear strength and load-bearing capacity, and reduces soil deformation. The restriction of the adjacent geocell provides additional resistance against the load hdpe geocell through passive resistance, while the lateral expansion of the infill is limited by the high hoop strength. Compaction is maintained by restraint for long-term reinforcement.