1. Before construction of a grouting curtain, on-site grouting tests shall be carried out; test holes shall be located in representative areas, and the water-cutoff and seepage-prevention effect shall be verified in the soil layer by combining borehole coring with water injection tests.
2. When pulling up grouting pipes, a pipe puller should be used.
3. When flowing water exists in the soil layer or the soil layer is relatively soft, the dual-fluid grouting method may be used to control the seepage range of the grout; after the two grouts are mixed, the time they remain in the pipe shall be less than the setting time of the grout.