Abstract: Traditional limit equilibrium methods consider a single failure mode when analyzing the stability of embankment reinforced with cement-soil mixing piles,and the calculation results may overestimate the overall stability of the embankment.The failure mode of soil mixing piles under embankment load was determined through centrifugal model testing.The subsoil is classified into compression-shear,direct-shear,and bending-shear zones based on the distinct failure characteristics of piles at different locations.A novel calculation method for the stability of cement-soil mixing pile reinforced embankments,accounting for multi-wedge failure,is proposed.The sliding failure surface of the embankment is conceptualized as three wedge-shaped bodies.This model simplifies multi-stage slopes using equivalent loads and bending moments.Individual force analyses are conducted on each wedge-shaped body to calculate the upper and lower limits of the overall safety factor.The average of these limit values is taken as the actual safety coefficient.The reliability and accuracy of this method are validated through relevant literature examples and actual engineering cases.Furthermore,the impact of soil and pile strength parameters on the safety coefficient is analyzed.The safety coefficient of the embankment exhibits a nonlinear increase with the strength of the soil and piles.Soil strength primarily affects the upper limit of the safety coefficient,whereas increased pile strength can reduce the accuracy of the calculation method.This study suggests that the proposed method is suitable for the stability analysis of embankments reinforced with cement-soil mixing piles (flexible piles) on soft soil.