Compacted granular columns are commonly used to support embankments over soft soils. Using a reinforcement layer under the embankment causes the total stress to be further transferred to the column rather than soft soil, thus reducing total deformations of the subsoil. In this paper two dimensional (2D) numerical analysis was used to study the influence of stone columns and basal geosynthetic on deformations and stability of an embankment over soft deposit by means of Plaxis 2D finite element code. Unit cell to plane strain conversion approach was applied to transform columns into equivalent walls thus allowing to simulate a full embankment over a group of columns. Comprehensive parametric analysis was then performed to investigate the role of different critical parameters on embankment behavior. Results showed that the use of stone columns yielded the total deformations of the subsoil to significantly reduce, while its influence was less remarkable as a high stiffness geogrid was placed under the embankment. It was also found that the stone column length was the most influential parameter on the embankment total deformations, so that increasing columns length from 0.25Hs to 0.75Hs reduced the vertical and horizontal deformations by about two and five times, respectively. In addition, the use of a high stiffness basal geogrid caused the stability of the embankment to remarkably improve as the value of safety factor at the end of construction increased from 1.25 to about 1.9.

压实的颗粒柱通常用于在软土上支撑路堤。在路堤下使用加固层会导致总应力进一步传递到柱上，而不是软土，从而减少了地基的总变形。本文采用二维（2D）数值分析方法，通过Plaxis 2D有限元编码研究了石柱和基础土工合成材料对路堤在软沉积上的变形和稳定性的影响。应用了晶胞到平面应变转换方法将立柱转换为等效墙，从而允许模拟一组立柱上的整个路堤。然后进行全面的参数分析，以调查不同关键参数对路堤行为的作用。结果表明，石柱的使用使底土的总变形显着减少，而当将高刚度土工格栅放置在路堤下方时，其影响较小。还发现，石柱长度是影响路堤总变形的最重要参数，因此，将柱长从0.25Hs增加到0.75Hs分别可减少垂直变形和水平变形的两倍和五倍。另外，随着施工结束时安全系数的值从1.25增加到约1.9，使用高刚度的基础土工格栅使路堤的稳定性显着提高。还发现，石柱长度是影响路堤总变形的最重要参数，因此，将柱长从0.25Hs增加到0.75Hs分别可减少垂直变形和水平变形的两倍和五倍。另外，随着施工结束时安全系数的值从1.25增加到约1.9，使用高刚度的基础土工格栅使路堤的稳定性显着提高。还发现，石柱长度是影响路堤总变形的最重要参数，因此，将柱长从0.25Hs增加到0.75Hs分别可减少垂直变形和水平变形的两倍和五倍。另外，随着施工结束时安全系数的值从1.25增加到约1.9，使用高刚度的基础土工格栅使路堤的稳定性显着提高。