Study of pollution effects on groundwater caused by modified urea-formaldehyde resin grouting

It is of practical significance to carry out a study on the pollution effect of typical chemical grouting materials on the regional groundwater quality. A dynamic seepage reaction system was developed, and constant-flow, long-term percolation tests were conducted on two groups: no grouting and urea-formaldehyde resin grouted group. The study found that UF slurry and its reaction products can cause significant pollution damage to groundwater quality, and grout contamination can last for quite some time before completely degrading. UF slurry can affect conventional water quality indicators of groundwater and can alter the water chemistry type of groundwater. The UF grouting process has a significant effect on the ionic content of groundwater. In the process of continuous infiltration, the hydrochemical type of groundwater gradually converges to that of the control group. The water quality indicators and ion content also gradually converge to the values measured in the control group. At the same time, the degradation of the main pollutants from the grouting process shows an exponential decay pattern.