High-pressure rotary jet technology is increasingly applied in the in-situ remediation of low-permeability contaminated site recently.The migration patterns of remediation agents in the soil surrounding the borehole after injection worth further investigation.In this study,the spatio-temporal distributions of agents around the borehole were simulated using finite element method considering the coupled effects among molecular diffusion,mechanical dispersion,convection and fines migration.The results show that high-speed flow fluid leads to fines migration in soil and higher permeability,which affects the convection-diffusion of agents.With the increasing of agent-injection pressure,the permeability grows significantly,resulting in bigger remediation area.Under high injection pressure conditions,the change in permeability coefficient is relatively small,and the remediation area does not significantly increase.Therefore,increasing injection pressure can help expand the remediation area in low-permeability sites,but excessive pressure may reduce the overall efficiency.The findings provide theoretical basis for the design of high-pressure rotary jet remediation in low-permeability sites.
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