High pressure jet grouted technique is one of effective methods for soft foundation treatment

but its application to existing expressway soft foundation treatment is relatively few.Combined with the Jiangsu coastal expressway soft foundation project example

this paper details reinforcement mechanism

construction technique and quality control method of the high pressure jet grouted pile technique in treatment of existing expressway soft foundation;according to field monitoring of pavement uplift during the construction period

gets the uplift variation rule of each monitoring point;based on Plaxis finite element software

sets up a numerical model

by the comparative analysis with field experiment

verifies the accuracy and reliability of the numerical model;then emphatically analyzes the influence law of grouting pressure on pavement uplift.This project example may give a reference to subsequent similar projects optimization design and quality monitoring.