<p>Over the past three to four decades, the Connected Pile Raft Foundation System (CPRF) has been increasingly utilized to support heavily loaded structures due to their economic and environmental sustainability. However, when piles and raft have rigid connections, considerable stress concentrations develop at the connections, potentially compromising structural integrity. To mitigate this issue, a novel foundation system known as the Disconnected Pile Raft Foundation System (DPRF) has been proposed, in which piles are separated from the raft by introducing an interposed layer between them. This study presents a series of numerical analyses performed using PLAXIS 3D software to evaluate the performance of both CPRF and DPRF in layered soil profiles under varying loading conditions. The constitutive behavior of the soil was modeled using the Hardening Soil Model with small-strain stiffness (HS-Small) to incorporate its nonlinear response. In contrast, the structural behavior of the piles and raft was represented using a linear elastic model. The results indicate that DPRF reduces structural forces in both the raft and piles compared to CPRF, although it leads to a marginal increase in overall foundation deformations. Furthermore, the impact of the interposed layer’s thickness and stiffness on the settlement of the foundation and structural forces in foundation elements was analyzed. Additionally, the effect of geogrid reinforcement within the interposed layer on the overall performance of the DPRF system was investigated. The findings contribute to a better understanding of DPRF behavior and its potential advantages over traditional CPRF systems in geotechnical engineering applications.</p>