Abstract:When surcharge loads are larger than the allowable bearing capacity or displacement at the top of piles is beyond the control criterion of displacement,reinforcement of soil should be implemented to enhance the stability and control the lateral displacement of piles. Deep mixing soil is one of the available and common reinforcement approaches. By finite element analysis on the interaction between soils,reinforced by cement-mixed soil in the passive zone,and the piles subjected to adjacent surcharge loads,the effect of width,depth and elastic modulus of cement-mixed soil on displacement control of piles is discussed and then some valuable conclusions are drawn for practice in ground treatment.