Application and research of post grouting technology of pile foundation in collapsible loess layer

This paper analyzes the technological principles and construction techniques of post grouting technology of cast-in-place pile,introduces construction points of construction procedure,grouting equipment,and cements slurry and so on,and proposes control parameters of critical techniques.Static loading test proves that post grouting technique has good effect for improving engineering features of the pile and enhancing bearing capacity and reducing settlement.Meanwhile,it has good economic benefits.