<p>In terms of the cooperative bearing of superstructure loads by pile‒soil interactions, the method of changing the geometric dimensions or arrangement of piles has remained challenging for precise adjustment in practical engineering. Based on the developed deformation adjustors at the pile top, model tests were conducted to investigate the adjustment mechanism of the deformation adjustors with respect to the bearing behaviors of both the hybrid and end-bearing pile groups. The results demonstrate that in hybrid pile groups, the installation of deformation adjustors significantly reduces differential settlement, which is only approximately 25.1% of that in conventional cases. The major adjustment occurs in the load partition between friction piles and end-bearing piles. For end-bearing pile groups, the adjustors optimize the distribution of applied loads with a load-sharing ratio of 35% by soils, which is significantly greater than that in conventional cases. The major adjustment occurs in the load partition between soils and end-bearing piles. Furthermore, the installation of deformation adjustors fundamentally alters the conventional load-transfer mechanism of piled raft foundations by prioritizing the mobilization of soil-bearing capacity during initial loading and subsequently transferring incremental loads to the pile components as the soil capacity is fully mobilized. During this process, this adjustment influences the surrounding soil within a radial distance of approximately 6 times the pile diameter. Notably, negative side frictions appear within 6–7 times the pile diameter beneath the pile top during its initial adjustment process, necessitating attention in the engineering practice of piled-raft foundations with deformation adjustors.</p>