<p>The study investigates the variation of pressure in dry sandy soil resulting from applied seismic loading on single connected and disconnected piled raft foundations. Using of geosynthetic-reinforced cushion layers modifies the dynamic structural characteristics and load transfer mechanisms. The research examines the behavior of connected single pile raft and single disconnected pile raft foundation with a cushion layer incorporates layers of geosynthetic materials in dry sand soil under seismic loading. The effect of cushion layer thickness reinforced with geosynthetic materials also had been investigated. However, the seismic behavior of the geosynthetic-reinforced cushion between disconnected piles and the raft foundation system remains under investigation. Experimental tests conducted using shaking table to evaluate the variation of pressure in the soil column using pressures cell, both on top of and between the disconnected or connected piles during seismic events. Time history of El-Centro earthquake applied to the base of the shaking table. The findings of study proved that disconnected piles can provide vertical support through the geosynthetic layer’s membrane effect, enhancing the soil’s load-bearing capacity. In most experimental tests, connected piles demonstrate greater stability in the variation of soil pressure cell beneath the raft foundations. The geosynthetic layers have a limited impact on mitigating pressure in soil column, mainly within the cushion layer, without significant effects along the soil depth.</p>