The current work comprises of a variety of experiments conducted on single piles and pile groups exposed to static lateral stress. The studies were carried out on single, (2x1), and (2x3) pile groups with pile spacing three times the diameter of each pile (S=3D). The model piles analyzed are concrete piles with a 10-m length and a 25-cm diameter that are anchored in loose sand (Dr=25%). The numerical model was created to investigate the influence of pile group size on group lateral capability on flat ground and near to an incline (3H:2V). The behavior of the piles was analyzed using 3-D elasto-plastic finite element method (FEM) software to simulate the problem. A comparison was made between the behavior of the group of heaps and the behavior of the single pile. The behavior of laterally loaded pile groups was shown to be strongly reliant on the orientation of the piles within the group with regards to the applied load direction. The behavior of pile groups in the presence of a slope was revealed to be dependent on the distance of the lead row of pile groups from the slope crest (B/D) and the positioning of piles in groups corresponding to the load direction