Numerical modeling and field test of soft foundation treatment technology in highway expansion project

For the expansion project of the soft soil subgrade section of highway, the mixed soilcement pile curtain wall (MSCPCW) was installed at the boundary of old and extended pavement. The settlements of soft soil foundation and construction process were simulated using the elastic-plastic finite element analysis software. The numerical simulation results are in line with the field test results, which show that the numerical model is accurate to describe the deformation of cement mixing pile and soft soil foundation. The combined method of MSCPCW and foundation treatment can effectively control the new and old roadbed difference settlement for expansion highway project.