Based on the suppositon of the process of pile driving of Precast Pressure Hollow Pile as the expansion process of cylindrical cavity expansion with initialized aperture and terminal aperture which are respectively equal to inner diameter and external diameter

the expressions of radius of plastical zone

soil displacement are deduced using cylindrical cavity expansion theory; the discussion of plugging effect which appear in the tubular pile costruction offenly is also made. The soil displacements are figured out provoked in the process of precast tubular pile costruction in an electric power plant extend program using the expressions; and the conclusion is come out by checking with data obtained from field monitoring that these expressions are appropriate and could be utilized to forcast the effect of precast tubular pile driving.