As a new grouting technology

pulsating grouting has been successfully applied to solve the problem of loose soil grouting. However

the dynamic response of slurry-soil coupling under pulsating load lags far behind the engineering practice. Based on the theory of pulsating grouting

a monitor system of pulsating grouting was designed. The response laws of sandy soil under different pulsating periodic loads were investigated by setting different pulsating periodic pressures and soil porosity ratios. Then through COMSOL Multiphysics platform and MATLAB

a program for simulating the stress-strain of slurry-soil coupling was developed. The applicability of numerical simulation was verified by comparing the existing grouting response theory with physical tests. The results show that when the pulsating pressure increases and the pore ratio of soil remains constant

the transfer rate of the pulsating stress borne by the skeleton force increases rapidly. The higher the pulsation frequency

the greater the soil stress. The fluctuating pressure will destroy the strong and weak force chain formed by the soil under constant load

resulting in the uniform stress transfer. The larger the pore ratio

the looser the soil and the higher the pulsation frequency

the more favorable the slurry migration in the soil. Compared with stable pressure grouting

pulsating grouting can lead to the stress concentration. Correspondingly

the slurry penetration and compaction caused by the stress concentration are beneficial to reduce the formation uplift displacement in the grouting process. Compared with stable pressure grouting

by which the grout is easy to split continuously along the small principal stress or formation defect

the grout diffusion induced by pulsating grouting is more controllable. In addition

the numerical simulation method provides a new idea for the slurry diffusion laws under different pulsating construction parameters

formation conditions and grouting materials. The research conclusions can provide a strong guiding significance for engineering practice.