Abstract: To study the influence of CementFly AshGravel (CFG) columns in minimizing the lateral squeezing force, excessive horizontal displacement and abutment tilting of the adjacent abutment piles induced by the soft soil lateral flow sue to the embankment construction, a series of numerical studies were performed with the sitespecific conditions. The analysis results show that, due to the shielding effect of the CFG columns on the lateral flow of the soft soil, the lateral squeezing force and excessive horizontal displacement of the abutment pile gradually decrease with the increased number of the CFG column replacement rate, and the horizontal displacement curve of the abutment pile rotates counterclockwise with the displacement neutral point. The abutment tilting is caused by the resultant moment of abutment lateral earth pressure and abutment pile lateral squeezing pressure. With the increase of the CFG replacement rate, the abutment tilt is gradually relieved, but there is still residual rotation.

Key words: CFG Columns, Soft Soils, Abutment Piles, Lateral Squeezing Force, Shielding Effect