This paper presents the results of recent experimental investigation of load incremental effect on the deformation of clay under axially loaded modeled wooden circular piles in clay. The modeled piles consist of 20 mm diameter, 200 mm length, made up of single pile, 4 No pile group of 2x2 with centre to centre a = 4d, and 9 No pile group of 3x3 with centre to centre a = 3d, were ...