Numerical Analysis of Reinforced Embankments over Soft Foundations Using Stone Columns

The improvement of soft soil foundations is essential in geotechnical engineering, particularly for infrastructure projects, such as highways, railways, and embankments. The soft soil formations pose significant challenges, including excessive settlement, low shear strength, and insufficient load-bearing capacity, which often render the traditional foundation methods inadequate. Stone columns are a widely adopted ground improvement technique due to their ability to enhance the soil stability, bearing capacity, and drainage efficiency. Advanced reinforcement techniques, such as stone columns, provide an effective solution, yet an understanding of the coupled soil-fluid interactions remains limited. This study employs a numerical approach to evaluate the stone column performance using a finite element model developed in FORTRAN 90. The model examines the embankment response under three conditions: without stone columns, with stone columns in a free-field scenario, and with stone columns under a surface foundation surcharge of 0.5 kN/m². The key parameters analyzed include Excess Pore Pressure (EPP) dissipation, deformation characteristics, and site stiffening effects. The numerical simulations indicate that the stone columns significantly reduce the settlement, accelerate the pore pressure dissipation, and improve the embankment stability by redistributing the stresses within the soil matrix. The findings confirm that the stone columns are a viable solution for soft soil reinforcement. The developed numerical model provides valuable insights into the effectiveness of the stone columns in embankment stabilization. Future research should focus on optimizing the stone column configurations, integrating real-time field monitoring, and exploring hybrid reinforcement techniques to further enhance the soil stabilization strategies.