Examining the ground’s deformation characteristics is valuable in assessing the impact of horizontal resistance of piles. In this study, horizontal pile loading experiments in a centrifugal 50G field and PIV were conducted for dense and loose sandy ground. Two types of experiments were conducted: one to observe the ground surface and another to observe the ground section. The size of the three-dimensional deformation area of ground in front of a pile at each loading stage was analyzed, and the results indicated that the horizontal resistance of a pile is related to the size of the deformation area of the ground.
