<p>The present research investigates the effectiveness of floating encased stone column in improving collapsible soil. Laboratory experiments were conducted to examine their ability to reduce collapse settlement. Different parameters were studied to assess their effects on the behavior of these columns, including the use of recycled aggregates as filling material, the relative density of the filling material, vertical and horizontal reinforcement, the inclusion of geogrid-reinforced sand bed, column geometry, and applied stress. The results indicate that using recycled aggregates in stone column construction offers an economical and sustainable approach to reducing collapse settlement and addressing environmental issues. Constructing encased columns with recycled crushed concrete and recycled crushed bricks achieved collapse settlement reductions of 77.8% and 62.6%, respectively. Additionally, the results demonstrate that collapse settlement decreased as the number of horizontal reinforcement layers increased and spaces between them decreased. The optimal spacing for these reinforcement layers was 0.25 times the column diameter. Furthermore, incorporating a reinforced sand bed above encased stone column considerably decreased both collapse settlement and bulging. Encasing half the length of the columns was the optimal solution; this might be significant regarding the efficiency and economics of using encased stone column technique to improve the behavior of collapsible soil in terms of collapse settlement reduction.</p>