Based on the field experiments at a project in a coastal area,a numerical model was built to simulate the construction of high pressure jet grouting in order to investigate the variation laws of pore water pressure caused by the construction of high pressure jet grouting pile.The results show that the pore water pressure of the soil at different depths along the radial direction is basically logarithmic attenuation,the pore water pressure along the depth generally shows a decreasing trend while the turning point appears in the local area,the calculation of a finite element with covering is closer to the measured data,the dissipation of pore water pressure derived from the deep finite element calculation method fits well with the measured data,and with the depth decreasing error increase.The pore water pressure increases with the increase of grouting pressure.